Quote Originally Posted by Ross77 View Post
Thanks Robin, not sure i understand, so is the buzzing/ frying noise when holding ok then? or Have I got problems?

The frying noise is probably a sympathetic vibration to the chopper frequency, possibly worse if you pause between half steps. Nothing to worry about so long as the motor isn't getting hot.

I'm no expert on this, my max stepper speed actually decreases if I wind up the current which seems totally wrong, so I am not understanding something. My motors clack out if I set the G0 to 12mm/s so I keep them set 8mm/s to avoid losing position. I'm waiting for Gary to send me some fancy 220 volt drivers which will hopefully make everything wonderful.

I suggest you wind up the current slowly, test the top speed and see if motors, or heatsinks on the driver start to get excessively hot.

Good luck

Robin