clunks / missing steps - DM856 and single pulse operation

[EddyCurrent]

So just to be clear, you are saying that it works fine with the HBS86 coupled with a bigger Nema 34 motor (other than noise) but it's not fine with the DM856 ?

The HC244 is often used as a buffer, it also has 2 active low output enables that can be used in a watchdog, E/stop, charge pump circuit.

[dsc]

Yes it seems that way, with the HBS65 and the big Nema 34 it seems to work fine ie.no glitches, steps seem complete and there's no erratic movement front / reverse. The big motor seems to be louder, there's a 'clunk' when it steps, but I'm not sure whether that's correct operation or not as I've never used steppers before. The small motor with the DM856 shows a lot of erratic movement when driven by the same signals from the PIC, even though the noise levels on that driver are much lower than the HBS86.

Regards,
T.