Direction Prechange setting

[fpworks]

What exactly does this mean?

Thanks,
Justin

[TommyB]

This is basically a delay that the software uses to delay steps to the drive after switching direction. Some drives need a certain amount of time delay after direction changes to move properly. I just ran into this problem tonight. I have a driver that i built based on the allegro sla7026 chip driven by the 5804 that needs a 3uS delay. Before I adjusted it, the z was missing steps, now it runs perfectly.

[ger21]

Mach3 has some changes to this to allow larger settings, if you need them. I think Mach2 is limited to 28uS. I think you can set it higher, but thats all you'll get. But you most likely won't need it nearly that high.

[fpworks]

Thanks,
The Mach2 manual didn't say much about "direction prechange." I goofed with that setting a little...my steppers made some weird noises around 20uS so I figured I would stop trying to fix something that isn't broken.

Thanks again,
Justin