I bought a used gantry plasma table and got it running the other day with an ess smoothstepper. No matter what my settings are in motor tuning or the ess pluggin, I still get a grinding noise on the Y axis at low speed. The X and Z sound great. I haven't changed the factory wiring on the motors. I had to use active high on one of the Y motors direction signal to get it to turn the right direction. Just wondering if running one motor on active lo and the other on active high could be giving me problems. Any advice is appreciated.