Glad you have it sussed but I'm curious. Isn't 120ipm kinda slow for Servos, especially with no load?
I suppose there are a number of factors to consider like, what kind of a machine (mill, router, lathe, etc)? How much weight are you moving around? And of course, what are you cutting (wood, metal, foam)?
I run my machine around 200IPM with my underpowered steppers and sometimes I could just scream because it is so arduously slow.
I always thought that one of the biggest advantage of Servos was that they could go so much faster and still give you the torque?
Just Curious.
Sid