I'm not really experienced with steppers at all, most all of my knowledge is
just from reading, and not actual experience, but if I were faced with your
problem, I would try reducing the microstepping in your drives and see how
well that works for you. to me it seems like yo might be at the limit of
some of your hardware on the step rate, and if you reduce the microstepping
you'll effectively reduce the number of steps to move the same distance.
Have you tried increasing the duration of the step pulses and the direction
hold etc? I saw it suggested earlier but dont recall if you tried it or
not.
One last thing that just came to mind is to see what voltage your parallel
port is outputting, or if you have a breakout board what it's opto's are
outputting. I know that logic voltage can affect rise time of a signal, not
sure if this would have anything to do with your attainable step rates.
Hope to see your machine cutting accurately and repeatably soon, i'm glad to
help what little i might be able to.
Jim
On Sat, May 24, 2008 at 5:00 PM, aaron Moore <[EMAIL PROTECTED]>
wrote:
> Hi agian
> If anyone can bear to listen to my woes
> I am still having problems configuring my stepper machine. As someone
> suggested, the problem seems to be with the rapid moves. I
> have got one good result with Velocity @ 20mm acceleration @ 10 with micro
> stepping set @ 16 with the motors wired in parallel,
> but I have not been able to repeat this success. Acceleration set above 20
> and the motors sound terrible and miss stepps. Below
> 20 the rapid moves do not go to the right place.
>
> Can anyone explain why the machine moves correctly on cutting moves and
> rapid moves go wonky?
> Thanks
> Aaron
>
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