[mactec54]

Hi,
It too have 5mm pitch ballscrews and I use electronic gearing to arrive at 5000 pulse/rev or 1um per step. The finish is perfect. Just because the servos
have a 160,000 count per rev does not mean you have to use it, and even if you did then you would require a motion controller that could produce
step/direction signals in the low mega-Hertz range, at huge cost......and to what advantage.......none.

Electronic Gearing does not change the Encoder you still have 160,000 PPR at the motor your electronic Gearing of 5000 step / per is 32:1 Ratio

If you went and bought new high resolution servos you would see no, or virtually no difference to surface finish or smoothness. Later model
servos may have better tuning aids and control modes that may help but the extra encoder resolution will make no difference. Craig

That is total BS