Hey guys, got a shopbot PRS 96x48 and Ive been having a bunch of problems with it. Whenever I try and cut circles or a diagonal cut the circle is not circular and the line will be wavy. Also, I tried to mill a half sphere and in the middle of doing the finishing pass the feed rate will slow down randomly and sometimes even stop and then go at normal rates again. I tried dropping the motors and putting them back because I thought it might be the pinion not engaging with gears on the rails but I am still having the problem.
https://drive.google.com/file/d/0B2F...it?usp=sharing