Re: [CAD_CAM_EDM_DRO] Tuning Geckos

One possibility is a 556 dual timer from Radio Scrap. The first half would
be set up to free run; that would set the pulse rate. These pulses would
trigger the second half which could would set pulse width. Steal +5 from the
PC. Pulse width and rate would be independent.

----- Original Message -----
From: "jbordens" <jake@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, July 29, 2002 6:56 AM
Subject: [CAD_CAM_EDM_DRO] Tuning Geckos


> Hello again all.
>
> I'm getting to the point where I'll be needing to tune my geckos.
> I've got my o-scope all set and ready, however, I don't own a
> function generator so I can't really generate the step pulses I need
> other than using a parallel port.
>
> The gecko docs say to ramp up a square wave of pulses and then
> reverse the direction pin... then watch the scope.
>
> is there a good way to do this in emc? I was thinking I could set
> up the accelleration profile to a high extreme so that the change in
> direction would be almost imediate. I'd jog in one direction, then
> jog in the opposite direction (or a qick bit of G-code to move back
> and forth)
>
> If not, I'll throw together a classic 555 timer to make some pulese
> for me. Does anyone know what frequency range I should be looking
> for when tuning?
>
> As always, thanks.
> Jake
>
>
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