Re: [CAD_CAM_EDM_DRO] Re: Adding encoders to existing stepper system?

JanRwl@... wrote:

>There's ONE point I have not noticed anyone mentioning in this thread: Would
>it not be necessary to "mechanically sync" the encoder to the
>stepper-detents, power-on (tighten the set-screw in the right place!), to
>make sure that the stepper "settled" approximately half-way between the rise
>and fall of the encoder-phases, to preclude horrible "jitter"???? Surely
>someone in here "KNOWS about all that"???
>
>

No. You have to set sufficient deadband (presumably in software) to
prevent jittering. Because of the
step accuracy of steppers, and the better, but still real, concentricity
errors in the encoders, it is
impossible to exactly match the steps and the encoder counts throughout
a full revolution.

EMC, at least, has a deadband setting in the setup file to take care of
that.

Jon