Re: [CAD_CAM_EDM_DRO] Digest Number 2595

Output like this is in the EMC's bridgeportio code already. Direction is
turned on by two pins and up and down speed by two more.

Ray

>    From: "Tim Goldstein" <timg@...>
> Subject: Re: Spindle RPM control
>
> It would be quite easy to program a PIC that took in the step and
> direction signals from an unused axis and output a PWM signal. What I
> am thinking is that you drive the "axis" in one direction to increase
> the speed and in the other to decrease it. Think of it just like you
> were driving a motorized pot with that axis. The PIC would then
> continue to put out the PWM signal at the commanded duty cycle until
> you move the axis and then it would change. Tim
> [Denver, CO]
>
> ----- Original Message -----
> From: "Jon Elson" <elson@...>
>
> > The basic idea makes sense, though.  But, it will take some amount of
>
> change
>
> > to the code so the code would produce a steady spindle speed.  A DAC
> > driven by the pc in some manner, so it could be set only when the
> > speed needs to change would relieve the load on the CPU.
> >
> > Jon