I am planning on replacing the variable speed pulley pulley system with a fixed ratio toothed belt drive. Primarily to raise the spindle speed and quieten the drive. Speed control will be with a VFD.
I am sure that others must have done this but my question is really "Does anyone here have any idea what is a sensible maximum spindle speed to run at with these machines"? As they came they should be able to do 4200 RPM so I guess that 5000RPM would be fine but what about 6000RPM?