Quote Originally Posted by Davek0974 View Post
Its not encoder related as far as i can see :(

I had a spare 600ppr encoder so wired that in and connected it by clamping in the spindle.

It still suffers the same fault, just slower as there are only 2,400 pulses instead of 10,000 per rev - the error count just goes up slower.

It still worked ok until 2980rpm.
I am not sure but I don't think the motors will go above 3K