Re: 4 Axis TB6560 CNC Stepper Motor NEMA23 Kit Mach3 Power Supply 57BYGH56-401A
They are TOTAL crap. The TB6560 isn't actually a bad chip, but it was NOT designed to be used in that way. The power up sequence is very specific and generally can not be assured when used as a component of a CNC system. I would STRONGLY recommend you look at TB6600 or THB6064AH drivers.
Actually... if you have money use a GeckoDrive... they are the best. And if you can solder, buy my THB6064AH kit. ,o)
James hosts the single best wiki page about steppers for CNC hobbyists on the net:
http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)