Re: [CAD_CAM_EDM_DRO] Re: setting up the CNC mill

> If your High-Low signal needs to be reversed, be sure to see Doug Fortunes
> 12:42Pm Post for a fix using a NAND Gate ! I had the same issue with MicroK
> drives and Indexer LPT. Ran excellent, but it would lose a very calculable
> amount of steps. Direction signal was not correct for the driver. Indexer sen
> t
> Low I think....... MK drives wanted high...............

This is all a matter of figuring out if the drive moves on the rising
or falling edge of the step signal. If you invert the signal, then it
will be effectively using the opposite edge it was using before. The
result is that it may move when the computer is merely reseting the
step signal for the next pulse and hasn't correctly set the direction
signal yet, rather than when the signal changes in the polarity that
the computer thinks meens "step now".

I think the step polarity is reversible in EMC, and perhaps other
programs as well.

hris