Re: [CAD_CAM_EDM_DRO] Stuttering stepper

walldawg1 wrote:

>I bought a cnc router from Blacklab machine(Ebay) and the machine has
>worked fine for a couble weeks now all the sudden one stepper (vexta
>pk268-03)seems to stutter and and STick
>
>It doesnt seem to be mechanical as far as the machine goes just that
>one stepper all the others are smooth.
>
>

Hmm, that's odd. Well, I can think of a couple of things to check.

First, see if any wires are loose, connectors not plugged in tightly,
etc.

Have you changed anything? Moved any wires, plugged something
into different outlets? Sometimes, these things can be more sensitive
than they should be.

Are you running it faster than you did when you started working
with it? Steppers have a speed limit, and if you try to go too fast,
or accelerate too rapidly, the motor can't keep up.

Does it do this only with the router motor running? Or, is it the
same, router on or off? If only with the motor running, it could
be electrical interference with the step signals to the Vexta drivers.

If there is any backlash in the coupling between the motor and the
moving parts, it can cause resonance problems to get much worse.
Possibly some setscrews just need tightening.

I hope one of these suggestions helps lead you to discover the problem.

Jon