Re: [CAD_CAM_EDM_DRO] 555 step generator

> The R/C timing circuit of a 555 can include a pot. One thing that I do
> is use a waveform generator, and set the duty cycle of a square wave to
> resemble that of a controller program. But why not just generate
> "moves" with a controller program on a PC? TurboCNC would probably fit
> the bill.

I could do that if it were going to be in my shop but the polisher is
going in a lab and should take up a minimum of space and be simple to
run.

> No point trying to build a very elaborate "test box" out of a 555 timer
> chip. Design a test box using a PIC. Pot, A/D converter, and a little
> code.

Now that's a good idea, don't know why it didn't cross my mind. I've
got everything I need to do that. This will allow me to put a timer in
the circuit as well so I can shut down the polisher and then the stepper
when someone leaves it on for a week.

Thanks for the tip, Alan.

Chris