Re: [CAD_CAM_EDM_DRO] Interfacing EMC with Bandit drives

Jack Ensor wrote:

> I compared your step table with mine and see that yours seems to be
> what it should be. However my Bandit does just as I listed in my
> table. It skips the first state in your table. I don't know why.

Hmmm? Besides the movements being 'lopsided', ie. moving 6 half steps
and then jumping one whole step, it makes the motor move with
steps of 400 * 8/7 = 457.1429.... steps/rev! That's a particularly wierd
number. If this is so, then either it has a VERY odd leadscrew,
or some sort of pulley ratio that compensates for this, like
28 : 32 tooth pulleys.

>
> Maybe it is broke and I don't know it. It seems to have the accuracy
> it should.
>
> Thanks for the suggested circuits for converting step/direction to
> make step phase signals. Could you explain the difference between
> half step and full step. Why would one choose one over the other?

Your machine is doing half-steps. These may be a little smoother,
as well as giving twice the position resolution. That is the major
reason for half stepping.

Jon