I just finished my 9x20 CNC conversion and after ditching my Acme Lead Screws adn Dumpstre CNC antibacklash nuts, I installed Roton Ballscrews and 2 blalnuts per axis ofr anti backlash. So Im gettnig .002 backlash on each axis. .... HimyKabibbel, Bridgeport and Hardinge Mills, 5, 08092008 08:14 PM. Backlash or motor tuning problem How do I test for backlash Brian Queen, Mcah Mill, 8, 03102008 03:35 PM. Backlash porblem, birchie, Okuma, 4, 12302007 04:33 PM ...