Re: Tuning Geckos

Jake

You could write a short nc program that would drive the axis one way and
then the other. Something like

g0 x2
x1
x2
x1

Or you can set an incremental jog and just hit the back and forth buttons
or keys. If you change direction during a jog, it will not complete that
distance before issuing the other so your end positions will wander.

Ray

>    From: "jbordens" <jake@...>
> Subject: 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