Great, I'll stick with the ATF for now.

The stepping ratio is actually another question I posted on the Xylotex group forum.

I was thinking that could be a problem as well.

I currently have 269oz steppers being run from the Xylotex board. I'm using Mach3; however, when I set things up I grabbed someones pre-configured Mach3 motor tuning setup. I noticed that the Revs Per is set at 32000, which seems very high to me; however, I have no idea how to figure out what the values should be.

Sorry I can't be of more help here.

Thanks