I have a 4 axis Taig mill with servos on it & was having problems making molds. I was getting irregular step over, detail areas were rounded over instead of sharp plus other types of steps in the part. After trying to figure out the gib thing, it helped a little but not what I wanted. After doing some investigation I decided to try a counter balance device like the big CNC's have & that solved my problems. If you are interested let me know & I'll post some of the pic's. otherwise you can find them on Nick Carter's web site @ cartertools.com