Re: rotary hand encoder wheels with detent

--- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:

> Hi Fred,
>
> I've been trying these step sizes, too many?
>
> 0.200
> 0.100
> 0.050
> 0.020
> 0.010
> 0.005
> 0.002
> 0.001
> 0.0005
> 0.00025
> 0.000125
>
> Although the Sherline and stepper motion hardware isn't accurate to

the

> smallest step size, it seems necessary if one wants to creep up to a
> surface, to set a zero on a part.

Not a problem from the development or "play" viewpoint. I suspect
that once you get it working and actually use it that you will only
want the .002 and .001.

The Stick-Slip on the ways and stepper granularity will be a problem
with small increments. You will turn the knob and nothing will
happen for a while every time you change direction (backlash).

For larger distances you will probably want to use the controller jog
and push in a button.

Are you doing anything with % Feed rate override? Have you given it
any thought? Some of the controller software has this built in as a
key press adjustment during program operation, some doesn't seem to
have any provisions to adjust the feed while the program is running.

Best Regards, Fred Smith- IMService

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