Quote Originally Posted by Davek0974 View Post
But these were tested with a different BOB when i was building the table and all settings were the same????

One difference is that the test PC was underpowered and only ran at 25khz, the work PC runs at 45khz, step and dir pulse length is 2us on both PC's
Don't know then. Maybe the new BOB does some filtering and signal boosting depending on the PP voltage.? If your on the edge with say 3V PP then the BOB could be boosting and inverting the signal just on that line.??? . . . .Strange beasts these CNC machines.!!!!