Hi all,

the machine is Mori Seiki MV40V with Fanuc 0M-C control, 1990year,

few days ago we got some kind of vibration on the X axis,
the vibrations are with constant period along the whole length of travel,
there is no alarm the machine keeps on running but the vibrations from the X axis can be seen on the surface quality.

We check the bearing, they are fine the motor vibrates even when is out of axle,
we swap the servo control between the X and the Y axis, the vibration stays on the X axis,
we swap the motors between X and Y the vibration still stays on the X axis.

Has anyone had this kind of a problem, and any suggestion how to first find the problem and then solve it?

regards