Re: [CAD_CAM_EDM_DRO] upgrade

----- Original Message -----
From: "Jonathan Stark" <cadcam@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, January 21, 2005 11:42 PM
Subject: Re: [CAD_CAM_EDM_DRO] upgrade


>
>
> Hi Scott,
>
> Quoting Scott L Golden (escowizard@...):
> > I think I have a M3 firmware bandit with RS232 hookup
>
> Cool. That suggests you actually got yours to start up! :)
>
> > Now you will have to go a little slow for me on the "quadrature output "
> > stuff. I'm not stupid but this end of things are not the easiest to
grasp.
>
> The stepper motors connected to my Bandit I have 4 phases (ABCD). The
> stepper motor 'steps' by having one (or more) of these phases energized.
> When they are energized, the motor 'steps' to align it's magnetic field
> with the energized coil(s).
>
> You can make your stepper motor move by energizing the phases in order.
> For single stepping, it might look like this:
>
> A B C D
> X - - -
> - X - -
> - - X -
> - - - X
>
> Backwards would be just the opposite;
>
> A B C D
> - - - X
> - - X -
> - X - -
> X - - -
>
> When you control the 4 phases independently, I've seen that called
> 'quadrature' inputs/outputs. In this case, it takes 4 signals.
>
> In the most common configuration I've seen for gecko drives, the gecko
> drive takes a step and direction input. When you send a 'step'
> signal to the gecko, it knows which coil(s) are energized now, and
> which coil(s) need to be turned on/off to move one step (or
> microstep) in the direction you gave it with the 'step' input.
> This only takes 2 inputs (step and direction) instead of 4.
>
> EMC can be configured to generate the 4 outputs you need above directly.
> All you need to do is wire your parallel port on your PC appropriately
> to the 16 pin ribbon cables in your bandit case, and assuming your
> bandit's drives work, EMC will drive your bridgeport with your existing
> drives. No capital investment required! :)
>
> EMC, Mach1/2/3, TurboCNC, and others can also be configured to
> work in the step/direction mode that gecko uses.
>
> Clear as mud? :)
>
> Jonathan
>
>
>
>
>
>
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