Hi,


Quote Originally Posted by andy_con View Post
Something is up with the speed control part. It keeps revving up and down it won't stay constant
Check and clean the encoder. If the encoder is OK its most likely the control circuit but not the motor itself.


Quote Originally Posted by andy_con View Post
Currently motor is 4000rpm at 1.5hp
So at 4000rpm I can run a 6mm cutter at about 250mm per min

I'm thinking 10000rpm means around 500mm per min
For a 6mm cutter: yes.
For a 20mm one: nope - the spindle will just stall.
A servo can create full torque at zero rpm - but the chinese spindle is an induction motor with very low torque at low rpm (at least with regular VFDs - but also vector control has its limits).

I'd also worry about the ATCs bearings - if they are designed for 4000rpm they may not survive 10000.

The Chinese spindle is only an option if your bearings survive it and you don't need low rpm anymore.

Christian