Hi John..

Have them wired in series and running at 2.5 amp.. Thats the way to get the most torque out of them yes? Have them stepping at 1/16th as the chain is a course pitch (1/2" pitch with 9 tooth drive spocket).. Tried them at 1/8th step but same problem..

Have the boards just out in the open at the moment, will put them in a nice box when everything is working.. As it was so cold in my workshop the last few days I did not think it would be a problem, but do you think they could be over heating? If that is a possibility I will box them with a nice fan before my next hair pulling session..

I was kinda thinking it might have been something in Mach 3 but the probs are a bit variable..

Steve..