[Custom Billet]

Hey Guys,
I just bought this machine and I have been having a few problems with it. Straight side cuts are perfect, but when you go into any angle or circular interpolations, it leaves a stair stepped or jagged finish.

I found a bad X axis ball screw. It had .004" backlash and it was very noisy. I had it rebuilt and I reinstalled it. I figured that had to be the problem.

The backlash is fixed but the problem remains. I tuned up the gain on both axis, and it helped, but only a little. It got to the point that it started to vibrate the machine. So I backed off the gain a little, but it is still not an acceptable finish. Any ides?
Thanks!!