Forum help

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Christian,

This is a reciprocating machine and much of the 1xRPM vibration will be due to the reciprocating motion in that plane. It is possible the rotating crank shaft has compensating weights that will help to reduce the vibration in that reciprocating plane, but they will then cause an unbalanced 1xRPM force in the perpendicular plane. The usual design has compensating weights designed to achieve a medium level of 1xRPM force. If there are compensating weights on the crank, you should not attempt to balance that shaft. The only solution to high vibration is either a very substantial foundation kept in good repair, or an isolation base. 

Gene

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Christian,

This is a reciprocating machine and much of the 1xRPM vibration will be due to the reciprocating motion in that plane. It is possible the rotating crank shaft has compensating weights that will help to reduce the vibration in that reciprocating plane, but they will then cause an unbalanced 1xRPM force in the perpendicular plane. The usual design has compensating weights designed to achieve a medium level of 1xRPM force. If there are compensating weights on the crank, you should not attempt to balance that shaft. The only solution to high vibration is either a very substantial foundation kept in good repair, or an isolation base. 

Gene

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Christian,

This is a reciprocating machine and much of the 1xRPM vibration will be due to the reciprocating motion in that plane. It is possible the rotating crank shaft has compensating weights that will help to reduce the vibration in that reciprocating plane, but they will then cause an unbalanced 1xRPM force in the perpendicular plane. The usual design has compensating weights designed to achieve a medium level of 1xRPM force. If there are compensating weights on the crank, you should not attempt to balance that shaft. The only solution to high vibration is either a very substantial foundation kept in good repair, or an isolation base. 

Gene

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Christian and Jim,

We could have a discussion about what is or isn't a reciprocating machine; the point is the mass of the moving jaw has a linear component in addition to a circular component. The linear component of the motion generates a 1xRPM force only in the that plane. Here's a good animation https://www.youtube.com/watch?v=3np_Ipw3R-A .Notice the compensating weight on the pulley. If the pulley has a compensating weight, it should not be balanced independent of the crank (eccentric) shaft. 

Gene

Christian,

This is a reciprocating machine and much of the 1xRPM vibration will be due to the reciprocating motion in that plane. It is possible the rotating crank shaft has compensating weights that will help to reduce the vibration in that reciprocating plane, but they will then cause an unbalanced 1xRPM force in the perpendicular plane. The usual design has compensating weights designed to achieve a medium level of 1xRPM force. If there are compensating weights on the crank, you should not attempt to balance that shaft. The only solution to high vibration is either a very substantial foundation kept in good repair, or an isolation base. 

Gene

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Christian and Jim,

We could have a discussion about what is or isn't a reciprocating machine; the point is the mass of the moving jaw has a linear component in addition to a circular component. The linear component of the motion generates a 1xRPM force only in the that plane. Here's a good animation https://www.youtube.com/watch?v=3np_Ipw3R-A .Notice the compensating weight on the pulley. If the pulley has a compensating weight, it should not be balanced independent of the crank (eccentric) shaft. 

Gene

Christian,

This is a reciprocating machine and much of the 1xRPM vibration will be due to the reciprocating motion in that plane. It is possible the rotating crank shaft has compensating weights that will help to reduce the vibration in that reciprocating plane, but they will then cause an unbalanced 1xRPM force in the perpendicular plane. The usual design has compensating weights designed to achieve a medium level of 1xRPM force. If there are compensating weights on the crank, you should not attempt to balance that shaft. The only solution to high vibration is either a very substantial foundation kept in good repair, or an isolation base. 

Gene

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Christian and Jim,

We could have a discussion about what is or isn't a reciprocating machine; the point is the mass of the moving jaw has a linear component in addition to a circular component. The linear component of the motion generates a 1xRPM force only in the that plane. Here's a good animation https://www.youtube.com/watch?v=3np_Ipw3R-A .Notice the compensating weight on the pulley. If the pulley has a compensating weight, it should not be balanced independent of the crank (eccentric) shaft. 

Gene

Christian,

This is a reciprocating machine and much of the 1xRPM vibration will be due to the reciprocating motion in that plane. It is possible the rotating crank shaft has compensating weights that will help to reduce the vibration in that reciprocating plane, but they will then cause an unbalanced 1xRPM force in the perpendicular plane. The usual design has compensating weights designed to achieve a medium level of 1xRPM force. If there are compensating weights on the crank, you should not attempt to balance that shaft. The only solution to high vibration is either a very substantial foundation kept in good repair, or an isolation base. 

Gene

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Hi, Eugene

I'm  totally agree with you.

Assuming that imbalance of the moving jaw and crank shaft is the problem, what is your opinion, should or shouldn't this equipment be balanced in site?

Christian and Jim,

We could have a discussion about what is or isn't a reciprocating machine; the point is the mass of the moving jaw has a linear component in addition to a circular component. The linear component of the motion generates a 1xRPM force only in the that plane. Here's a good animation https://www.youtube.com/watch?v=3np_Ipw3R-A .Notice the compensating weight on the pulley. If the pulley has a compensating weight, it should not be balanced independent of the crank (eccentric) shaft. 

Gene

Christian,

This is a reciprocating machine and much of the 1xRPM vibration will be due to the reciprocating motion in that plane. It is possible the rotating crank shaft has compensating weights that will help to reduce the vibration in that reciprocating plane, but they will then cause an unbalanced 1xRPM force in the perpendicular plane. The usual design has compensating weights designed to achieve a medium level of 1xRPM force. If there are compensating weights on the crank, you should not attempt to balance that shaft. The only solution to high vibration is either a very substantial foundation kept in good repair, or an isolation base. 

Gene

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Such rotor could be balanced on site. The pre-condition is to troubleshoot the looseness problem, which was significantly seen inside the spectras.
The looseness cannot be balanced. Can be partially dumered by balancing, but the problem persists and later on appear again with bigger intesity. 

Hi, Eugene

I'm  totally agree with you.

Assuming that imbalance of the moving jaw and crank shaft is the problem, what is your opinion, should or shouldn't this equipment be balanced in site?

Christian and Jim,

We could have a discussion about what is or isn't a reciprocating machine; the point is the mass of the moving jaw has a linear component in addition to a circular component. The linear component of the motion generates a 1xRPM force only in the that plane. Here's a good animation https://www.youtube.com/watch?v=3np_Ipw3R-A .Notice the compensating weight on the pulley. If the pulley has a compensating weight, it should not be balanced independent of the crank (eccentric) shaft. 

Gene

Christian,

This is a reciprocating machine and much of the 1xRPM vibration will be due to the reciprocating motion in that plane. It is possible the rotating crank shaft has compensating weights that will help to reduce the vibration in that reciprocating plane, but they will then cause an unbalanced 1xRPM force in the perpendicular plane. The usual design has compensating weights designed to achieve a medium level of 1xRPM force. If there are compensating weights on the crank, you should not attempt to balance that shaft. The only solution to high vibration is either a very substantial foundation kept in good repair, or an isolation base. 

Gene

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Christian,

This is a reciprocating machine and much of the 1xRPM vibration will be due to the reciprocating motion in that plane. It is possible the rotating crank shaft has compensating weights that will help to reduce the vibration in that reciprocating plane, but they will then cause an unbalanced 1xRPM force in the perpendicular plane. The usual design has compensating weights designed to achieve a medium level of 1xRPM force. If there are compensating weights on the crank, you should not attempt to balance that shaft. The only solution to high vibration is either a very substantial foundation kept in good repair, or an isolation base. 

Gene

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

The problem could be in anchoring. For every Jaw crusher, the good anchoring is a must.
The glued iron thread in the drilled hole is mostly not an anchor for that cases (that way yours was pulled out). Such anchor should be really really long (trough big concrete piece), with very special chemical glue, the concreate must not be oiled, inside the bore must be "a net" tube to hold the glue by the bolt. Shortly the anchoring is not a easy job, must be performed by skilled professional. 

The optimal way is to have a rally strong anchor... The anchoring bolt is normally really strongly wellded or better circled to strong a perpendicular beem, deeply inside the big concrete base. The weight of the concrete must be well calculated (or over-dimensed to really void resonance problem).  Foundation dimensioning is a question for an engineer calculation. The RPM must be really deeply under resonance. Interconnectiog of several concrete parts is offten a source of the troubles, so that way is not recommended. The concreate must be not young during machine startup. Too early machine start can cause crack or looseness inside concreate, steel anchoring can bend, loose or fail soon.

As soon as the foundation and anchoring is OK, you can start with vibration troubleshooting.
Regards, Jan

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Hello, Jan

I'm  totally agree with you. But now a compromise solution must be found or perhaps a problem that existed from the beginning should be fixed.

The problem could be in anchoring. For every Jaw crusher, the good anchoring is a must.
The glued iron thread in the drilled hole is mostly not an anchor for that cases (that way yours was pulled out). Such anchor should be really really long (trough big concrete piece), with very special chemical glue, the concreate must not be oiled, inside the bore must be "a net" tube to hold the glue by the bolt. Shortly the anchoring is not a easy job, must be performed by skilled professional. 

The optimal way is to have a rally strong anchor... The anchoring bolt is normally really strongly wellded or better circled to strong a perpendicular beem, deeply inside the big concrete base. The weight of the concrete must be well calculated (or over-dimensed to really void resonance problem).  Foundation dimensioning is a question for an engineer calculation. The RPM must be really deeply under resonance. Interconnectiog of several concrete parts is offten a source of the troubles, so that way is not recommended. The concreate must be not young during machine startup. Too early machine start can cause crack or looseness inside concreate, steel anchoring can bend, loose or fail soon.

As soon as the foundation and anchoring is OK, you can start with vibration troubleshooting.
Regards, Jan

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Another problem is the fact that the electric motor burns out.
When the motor starts, it takes a lot of voltage and the beneficiary is forced to skip the high voltage motor protection.
I think that this is also an abnormal operation and is not related with foundation problem. 

Hello, Jan

I'm  totally agree with you. But now a compromise solution must be found or perhaps a problem that existed from the beginning should be fixed.

The problem could be in anchoring. For every Jaw crusher, the good anchoring is a must.
The glued iron thread in the drilled hole is mostly not an anchor for that cases (that way yours was pulled out). Such anchor should be really really long (trough big concrete piece), with very special chemical glue, the concreate must not be oiled, inside the bore must be "a net" tube to hold the glue by the bolt. Shortly the anchoring is not a easy job, must be performed by skilled professional. 

The optimal way is to have a rally strong anchor... The anchoring bolt is normally really strongly wellded or better circled to strong a perpendicular beem, deeply inside the big concrete base. The weight of the concrete must be well calculated (or over-dimensed to really void resonance problem).  Foundation dimensioning is a question for an engineer calculation. The RPM must be really deeply under resonance. Interconnectiog of several concrete parts is offten a source of the troubles, so that way is not recommended. The concreate must be not young during machine startup. Too early machine start can cause crack or looseness inside concreate, steel anchoring can bend, loose or fail soon.

As soon as the foundation and anchoring is OK, you can start with vibration troubleshooting.
Regards, Jan

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Overcurrent or undervoltage protection is the basic device which could helps you not to burn your motor.
If that device is switched off or unproperly dimensed or unproperly set limit, that is the way to hell.

This is a question for really skilled electrician, not vibration guys. When such protection protects, it isshould have a real reason. ...and yes, it can be mechanical and could sourcing inside machine and its vibrations. There is not easy to troubleshoot trough letters. 

Another problem is the fact that the electric motor burns out.
When the motor starts, it takes a lot of voltage and the beneficiary is forced to skip the high voltage motor protection.
I think that this is also an abnormal operation and is not related with foundation problem. 

Hello, Jan

I'm  totally agree with you. But now a compromise solution must be found or perhaps a problem that existed from the beginning should be fixed.

The problem could be in anchoring. For every Jaw crusher, the good anchoring is a must.
The glued iron thread in the drilled hole is mostly not an anchor for that cases (that way yours was pulled out). Such anchor should be really really long (trough big concrete piece), with very special chemical glue, the concreate must not be oiled, inside the bore must be "a net" tube to hold the glue by the bolt. Shortly the anchoring is not a easy job, must be performed by skilled professional. 

The optimal way is to have a rally strong anchor... The anchoring bolt is normally really strongly wellded or better circled to strong a perpendicular beem, deeply inside the big concrete base. The weight of the concrete must be well calculated (or over-dimensed to really void resonance problem).  Foundation dimensioning is a question for an engineer calculation. The RPM must be really deeply under resonance. Interconnectiog of several concrete parts is offten a source of the troubles, so that way is not recommended. The concreate must be not young during machine startup. Too early machine start can cause crack or looseness inside concreate, steel anchoring can bend, loose or fail soon.

As soon as the foundation and anchoring is OK, you can start with vibration troubleshooting.
Regards, Jan

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Hello, Jan

I'm  totally agree with you. But now a compromise solution must be found or perhaps a problem that existed from the beginning should be fixed.

The problem could be in anchoring. For every Jaw crusher, the good anchoring is a must.
The glued iron thread in the drilled hole is mostly not an anchor for that cases (that way yours was pulled out). Such anchor should be really really long (trough big concrete piece), with very special chemical glue, the concreate must not be oiled, inside the bore must be "a net" tube to hold the glue by the bolt. Shortly the anchoring is not a easy job, must be performed by skilled professional. 

The optimal way is to have a rally strong anchor... The anchoring bolt is normally really strongly wellded or better circled to strong a perpendicular beem, deeply inside the big concrete base. The weight of the concrete must be well calculated (or over-dimensed to really void resonance problem).  Foundation dimensioning is a question for an engineer calculation. The RPM must be really deeply under resonance. Interconnectiog of several concrete parts is offten a source of the troubles, so that way is not recommended. The concreate must be not young during machine startup. Too early machine start can cause crack or looseness inside concreate, steel anchoring can bend, loose or fail soon.

As soon as the foundation and anchoring is OK, you can start with vibration troubleshooting.
Regards, Jan

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Hi, Nick

The shaft is new. The bearings are new.

Phase measurements will determine if the shaft is bent or not. At the moment I cannot assume that the shaft is bent.

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Hi Christian,
how you can speak about phase vibrodiagnostic measurement, as if there is a looseness problem (wrong anchoring or foundation issue). That looseness problem must be fix as the first step. Otherwise your phase measurement show you 50% of fairytales.... (looseness significantly influence the phase vector itself)

Hi, Nick

The shaft is new. The bearings are new.

Phase measurements will determine if the shaft is bent or not. At the moment I cannot assume that the shaft is bent.

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

As I said earlier, in the start they will have to remake the tightening of the frame on the fundation after witch I will make vibration and phase measurements in oder to establish if the problem is unbalance and whether it can be balanced or not. At first glance, in my opinion, the highest probability is that the problem can be caused by unbalance.
Because I don't have experience with this kind of machines,  I asked members for help regarding with ballancing  for this tipe of machines.

Hi Christian,
how you can speak about phase vibrodiagnostic measurement, as if there is a looseness problem (wrong anchoring or foundation issue). That looseness problem must be fix as the first step. Otherwise your phase measurement show you 50% of fairytales.... (looseness significantly influence the phase vector itself)

Hi, Nick

The shaft is new. The bearings are new.

Phase measurements will determine if the shaft is bent or not. At the moment I cannot assume that the shaft is bent.

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Christian, If you wish to attempt to balance this machine, setup for 2 plane balancing in the horizontal plane and record the original amplitude and phase vector for both sides of the machine in the horizontal plane. Then move you transducers to the vertical plane and record those amplitude and phase vectors. I recommend that you manually plot the vectors on polar graph paper with the horizontal and vertical vectors for one side on one graph and the horizontal and vertical vectors for the other side on a separate graph. Label the vectors Oh and Ov  Then add a significant trial weight to the rotor on one side of the machine, (add the weight to the pulley). Now record new horizontal and vertical vectors for both sides of the machine. Plot these vectors on the appropriate graphs and label them O+Th and O+Tv. Now construct the Th and Tv vectors for the side of the machine to which you added the trial weight, (draw a vector from Oh to O+Th and from Ov to O+Tv). You now have both a horizontal and vertical single plane vector solution. If at this point you are totally confused by the vector diagrams, you will not be able to balance this machine; there are no automatic balancing programs that will solve this problem for you. You will need to evaluate the horizontal and vertical vector diagrams and see if they both produce similar solutions. If the horizontal and vertical solutions are NOT similar, the vibration is not due to rotor imbalance, but rather is likely the result of the reciprocating action of the moving jaw, and there is no way to reduce the vibration with balance weights. If the horizontal and vertical vector solutions are similar, proceed to single plane balance that side of the machine. If this single plane balancing is successful in reducing the vibration on this side of the machine, (in both the horizontal and vertical planes), the process can be expanded to 2 plane balancing using either the horizontal vector data from both sides of the machine or using the vertical vector data from both sides of the machine.

I hope this is helpful.

Gene

As I said earlier, in the start they will have to remake the tightening of the frame on the fundation after witch I will make vibration and phase measurements in oder to establish if the problem is unbalance and whether it can be balanced or not. At first glance, in my opinion, the highest probability is that the problem can be caused by unbalance.
Because I don't have experience with this kind of machines,  I asked members for help regarding with ballancing  for this tipe of machines.

Hi Christian,
how you can speak about phase vibrodiagnostic measurement, as if there is a looseness problem (wrong anchoring or foundation issue). That looseness problem must be fix as the first step. Otherwise your phase measurement show you 50% of fairytales.... (looseness significantly influence the phase vector itself)

Hi, Nick

The shaft is new. The bearings are new.

Phase measurements will determine if the shaft is bent or not. At the moment I cannot assume that the shaft is bent.

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

As I said earlier, in the start they will have to remake the tightening of the frame on the fundation after witch I will make vibration and phase measurements in oder to establish if the problem is unbalance and whether it can be balanced or not. At first glance, in my opinion, the highest probability is that the problem can be caused by unbalance.
Because I don't have experience with this kind of machines,  I asked members for help regarding with ballancing  for this tipe of machines.

Hi Christian,
how you can speak about phase vibrodiagnostic measurement, as if there is a looseness problem (wrong anchoring or foundation issue). That looseness problem must be fix as the first step. Otherwise your phase measurement show you 50% of fairytales.... (looseness significantly influence the phase vector itself)

Hi, Nick

The shaft is new. The bearings are new.

Phase measurements will determine if the shaft is bent or not. At the moment I cannot assume that the shaft is bent.

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

I did sucessfully balance such reciprocation machine using Emerson CSI device using 4 channels measurement (2x Ver + 2× hor). Their vector averaging algorythm (developed together with Schenck I guess) work well also for reciprocating machine. Try csi 2130 or csi2140 or Emerson AMS 2140 or any other device with more complex field balancing software. In troubles it can move you forward.

As I said earlier, in the start they will have to remake the tightening of the frame on the fundation after witch I will make vibration and phase measurements in oder to establish if the problem is unbalance and whether it can be balanced or not. At first glance, in my opinion, the highest probability is that the problem can be caused by unbalance.
Because I don't have experience with this kind of machines,  I asked members for help regarding with ballancing  for this tipe of machines.

Hi Christian,
how you can speak about phase vibrodiagnostic measurement, as if there is a looseness problem (wrong anchoring or foundation issue). That looseness problem must be fix as the first step. Otherwise your phase measurement show you 50% of fairytales.... (looseness significantly influence the phase vector itself)

Hi, Nick

The shaft is new. The bearings are new.

Phase measurements will determine if the shaft is bent or not. At the moment I cannot assume that the shaft is bent.

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Hi Jan,
Thanks for your advice.
From your experience, is the order and position of the measurement points important?
I avoided using readings in both directions within the same balancing program.
I was thinking of using channel 1 for the DE bearing and channel 2 for the NDE bearing for horizontal readings and channel 3 for the DE bearing and channel 4 for the NDE bearing for vertical readings. Is it ok or do you recommend another mounting of the transducers?

I did sucessfully balance such reciprocation machine using Emerson CSI device using 4 channels measurement (2x Ver + 2× hor). Their vector averaging algorythm (developed together with Schenck I guess) work well also for reciprocating machine. Try csi 2130 or csi2140 or Emerson AMS 2140 or any other device with more complex field balancing software. In troubles it can move you forward.

As I said earlier, in the start they will have to remake the tightening of the frame on the fundation after witch I will make vibration and phase measurements in oder to establish if the problem is unbalance and whether it can be balanced or not. At first glance, in my opinion, the highest probability is that the problem can be caused by unbalance.
Because I don't have experience with this kind of machines,  I asked members for help regarding with ballancing  for this tipe of machines.

Hi Christian,
how you can speak about phase vibrodiagnostic measurement, as if there is a looseness problem (wrong anchoring or foundation issue). That looseness problem must be fix as the first step. Otherwise your phase measurement show you 50% of fairytales.... (looseness significantly influence the phase vector itself)

Hi, Nick

The shaft is new. The bearings are new.

Phase measurements will determine if the shaft is bent or not. At the moment I cannot assume that the shaft is bent.

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>

Hi, Nick

The shaft is new. The bearings are new.

Phase measurements will determine if the shaft is bent or not. At the moment I cannot assume that the shaft is bent.

From what I was told, during the repair, the following were done:
- all the crusher bearings were replaced
- the old foundation was removed and another one of the same size was made (from my point of view, undersized)
- the crusher body was replaced because the old one had cracks
- after casting the foundation, the crusher frame was placed on the foundation and fixed with 3 bolts on each foot. The bolts were fixed in the foundation with chemical anchors for concrete.
Right from the start, the crusher had vibrations and in a short time it pulled the bolts out of the concrete.
Since each foot has 8 or 10 holes (I don't remember exactly), they made other holes in the concrete and fixed the feet with more bolts.
The same thing happened, the bolts were pulled out of the concrete on the same feet.
From what I observed, either the foundation was not poured in the same plane, or the feet are not in the same plane.
In the first phase, I asked to be inserted shims under the feet that are in the air to compensate for the space between those feet and  foundation, after which to restore the fixing.
Breaking and pulling out the bolts from the concrete is the effect of the problem, not the cause.
I think that even after the setting of the frame is redone, the amplitude of the vibrations will be high.
For these reasons, my question also arises: should I balance this equipment or not?

I do not have pictures with the unit.

Hello everyone<o:p></o:p>

I would need your opinion on a problem I am facing.<o:p></o:p>

I recently did vibration measurements on a jaw crusher.<o:p></o:p>

From the spectral analysis, the vibrations seem to be caused by imbalance.<o:p></o:p>

If someone has experience with such equipment, maybe you can help me with an idea about the possibility of balancing this equipment.<o:p></o:p>

Can it be dynamically balanced like any other equipment or are there special balancing techniques?<o:p></o:p>

Must there be a state of imbalance in the operation of this type of equipment?<o:p></o:p>

I don't know if I should balance it or if this state of imbalance is normal.<o:p></o:p>

Any opinion is welcome.<o:p></o:p>

PS<o:p></o:p>

The crusher was under repair where the bearings were replaced and the foundation was rebuilt.<o:p></o:p>

It probably had the same problem before, leading to the destruction of the foundation and bearings.<o:p></o:p>

Now due to the imbalance (in my opinion), mechanical looseness appeared in the area where the frame is fixed to the foundation<o:p></o:p>