Re: software for EDM maschine

I still don't see it. Reversing a path in step and direction could
be as easy as storing the step and direction train and playing it
back.

Yes the machine me built *sufficiently* well but that is always the
case and was not the point made by the poster.

Graham


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<dave_mucha@y...> wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler"

<eexgs@n...>

> wrote:
> >
> > Can you tell me what has trajectory planning got to do with EDM?
> >
> > I can't see what is so hard about reversing (to a DIY standard)

as

> > long as your g-code translation software is tied in to the

machines

> > voltage/current feedback etc.
>
>
> Considder a 3 axis move on the EDM.
>
> The software would have to retain the steps so as to be able to
> reverse in the exact same path.
>
> But, since EDM has such close tollerances, the cutter often not
> leaving more than 1/10 mm gap, the machine must also be capable of
> the accuracy needed to reverse steps.
>
> Many of our home brew are not accurate or stable enough for usch
> reversing.
>
> For plunge, it can be simpler, even if the X and Y were both

moving

> at different speeds, the Z can just retract, the program could

memory

> of the last 10 steps, then just re-wind 10 steps and re-start.
>
> So, it is not trajectory planning, but reverse that is so hard.
>
> Dave