Problem: z-axis vibrates with slow movement .
Most worst vibration when pulsehandle is used or rapid at 10%
If actual position (wanted) is for example 300.486 and if you look actual (APA) coordinates, they vary from 300.48-300.54-> So machine never reaches "goal". No help of changing parameters.
In Fanuc and Siemens we have sometimes triggered servo (GAIN). But now problem was measuring rod.I think Okuma uses both pulsecoder and measuring rod(?)
We did take measuring rod wires off and no problem after that. Of course machine accuracy is not as good,but enough for us.
Z-axis measuring rod change is BIG job, because you have to take loads of parts to get access to rod.
Hope this helps someone