Re: [CAD_CAM_EDM_DRO] stepper issues

Hello Chuck,

> 1 - we didn't use pullup/down resistors for the full, half, direction
> pins - we just tied them to +5 or gnd.

Pull ups not needed since you tied directly to +5v. I recommend that you
select the smallest fractional step that you can. Looks like half step
is what you can use. Smaller steps mean smoother motion and less likely
to be problematic.

For the stalling problem, I suggest testing at a very low speed. If it
works ok then double the speed and try again. Keep doubling the speed
until problems occur. Then try speeds between these two to find where it
fails. Then run slower than that.

It will be different when you put a load on it. Probably have to run
slower but maybe not. Use the same method as above if you have problems
under load.

Another note for loading later. Steppers have max torque at lowest
speed. As they go faster they are less capable of full load. So if speed
is not essential then keep it down for better reliability under load.

Tom Hubin
thubin@...