Re: [CAD_CAM_EDM_DRO] What is wanted in a controller,

Hi Brian,

Yes, I can see that. In and out of MDI to reset DRO of jog encoder.
The encoders I have give just a little "feel". Your saying that 16
preset override values would work, why not just "scroll" through a list
of overrides, like the jog distance? Cheaper then BCD switches. I'd
think a 10 turn pot into an A/D converter would give good control also.
Now to figure out how to do the override in the motion code (mine).

Alan KM6VV


Brian Pitt wrote:

>
> Hi Alan
>
> to re-zero the handwheel you just switch from JOG mode into MDI
> so the handwheel is ignored and move the wheel back to the zero mark
> switching back into JOG mode restarts your encoder read function on
> the game port with the current encoder value
>
> all you need now is a spring detent plate on the encoder shaft to give
> that "Click" feel to it and the setup you've already got will be just about
> as good as the $300 commercial pulse generator controls!
>
> for the feedrate and spindle speed overrides you dont need any A/D
> inputs at all (you could use them) it can be done all digital
> 2ea 16 position BCD or Gray coded switches (4bits each) on a spare
> parallel port would give overrides from 0-150% by tens
>
> Brian
>
> > If we use a "DRO" approach, then perhaps one could "zero" the knobs,
> > THEN we'd know exactly where they were! (Zero the knob, and "reset" the
> > encoder chips to zero).