Originally Posted by
artracing
Thanks for asking. When rebuilding this I broke the golden rule, never assume someone did their job right. No wonder this company went out of business. The guy I got this CNC from only tried a number of projects on this CNC. They could never run the machine fast or hold tolerances they needed. They pretty much abandon the machine.
The gantry is pretty robust. So I assumed the mechanics were good. Low and behold, I wasted lot of my time and few others trying to tune the servo, when all the problems were in the mechanics. Each pillow block was out .030" Meaning, with the rollers at their most forward position, they were still .030 away from rail.
Either the machinest who hand made them was .030 out in his setup or the designer gave him wrong numbers.
Anyway, with those fixed, and retuned, the servo it running like a bear.
With the mechanics bad, I could only run 100ipm and as soon as it was all fixed I can do 400ipm and still has more to go.
I have run a complex 3D quitar body perfectly.