Originally Posted by
CL_MotoTech
Loads of information there...
I have seen information on those stepper couplers failing, they seem to fatigue out. Also, .0015" backlash isn't bad, certainly not for a machine of this design and size. You can halve that or more with double nuts. The big issue with these machines isn't necessarily reducing backlash, I think anything under .002" is more than adequate (I don't own a RF25 but rather a G0704). The issue is getting the gibs tight enough to keep everything tight without stalling steppers. You can easily produce more than .002" of play in the table by reducing gib tightness for the sake of preventing lost steps.