I have a problem with a grinding machine, hence the system has a overhung mass. The grinding wheel have a dynamic balancing device and it can reduce the vibration in radial direction. However it can not reduce the vibration in axial direction. How can I reduce the vibration in axial direction?

Hi again Rubipako.

Can we have a bit more information please.
What size and weight is the wheel?
How fast is it rotating?
How is it driven?

One possible cause for axial vibration would be if the wheel was not accurately mounted on the shaft i.e. was not exactly perpendicular to the shaft axis.

How is the wheel located on the shaft? Is there a shoulder that it locates against axially? Is the bore of the wheel very accurate and how does this locate on the shaft?

Hi again,

The wheel has an outer diameter of 750 mm and weights, together with its wheel and fixing flanges, around 80 kgs.
It rotates at approximately 1500 r/min and it is driven by belts.

The wheel is mounted by placing the fixing flange on a conical surface of the shaft and fixing it with screws.
This way we get an axial and radial fixation.

is there any kind of balancer on the wheel (externeal or internal) if there isnt, that is what you will need if the wheel is mounted correctly.

yes. It has a balancer on the wheel. It is said in the first post. The wheel starts rotating and the unbalance is reduced by the effect of this balancer. This device consists on three masses in the same plane of the wheel that move to compensate the radial unbalance. However, once reduced radial, the axial unbalance increases.

how old is the balancer, can you see the reading that the balancer is putting out when in operation, it sounds like its not working to me. what kind of balancer is this?

the reason i ask is that i run all our measuring and control systems on our grinding machines, we have balancers on every one of them. i wonder if you are using the same kind as us. we use balance systems. we have not had a problem with them.

quote:

Originally posted by Rubipako:
This device consists on three masses in the same plane of the wheel that move to compensate the radial unbalance. However, once reduced radial, the axial unbalance increases.

Rubipako,

I am curious if radial vibration gets reduced on both IB and OB bearings? My bet the answer is not.

Rubipako,
I would suggest making sure that the base of this grinder is level and not rocking. I have seen this problem in the past. It was as simple as adjusting the base feet to solve the problem. Just a thought to at least rule this out.