Re: [CAD_CAM_EDM_DRO] MPG behaviour

Hi John,

My encoder is implemented in my STEP4 controller program, not a
commercial product. It uses an HP panel shaft encoder, 256 lines or so,
as I recall. I decode 256 counts/rev, and there are no "detents". I
have a Sherline axis handle on it, and it turns easily, but cannot be
said to "spin" (maybe I will try a heavy knob sometime).

Counts generated faster then the axis can respond are ignored. I can
set the distance to be moved per count, and the rate to move at (I
generate a series of incremental moves).

I use a pair of push buttons along with the encoder on a pendant. One
push button cycles through an "increment" cable, and the other cycles
through the axis.

No exact correlation between the knob and the move exists, the axis
could be said to continue to move until the knob movement stops.

Alan KM6VV


John Dammeyer wrote:

> Hi guys,
>
> I have a question for people who are using a Manual Pulse Generator on their
> system. If it has detents and you can feel it click how far do you have
> your table programmed to move per click.
>
> If you twist it more rapidly than the table can move, does the table
> continue to move after the twisting of the MPG is done?
>
> I guess I'm asking if the MPG is programmed to move 0.005 per click and you
> give the knob a whirl that moves the knob 0.100 equivalent distance at a
> speed that would be 10x the slew rate does the table move 0.100 or does it
> just go until the knob stops?
>
> Thanks,
>
> John Dammeyer
>