Robin, thanks for your info. If I understand your approach it's more aggressive than I imagined would be possible - I was planning to use accel and decel values for all starts and stops (can be set in EMC2, not sure about mach3). Just to check my understanding, you only find it necessary to apply accel and decel above a certain speed, and below this speed you can go from forward to reverse with no ramping?

I might try for 19mm or 20mm then. But belts, - I haven't designed the machine for those at all... :nope:

Kip, is this the "patented" design of which you speak? :naughty: Seems quite clever, but can you really patent that?

I did a search for Mike Everman actually. He seems to be everywhere. One of the threads lead me to this (start of geek voice) very interesting (end of geek voice) looking book. Would probably answer all my questions... :geek: