Re: [CAD_CAM_EDM_DRO] 555 step generator

Hi Chris,

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.

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.

HTH

Alan KM6VV


Chris Brick wrote:

>
> Alan,
>
> Thanks for the link.
>
> > I posted a 555 pulse generator circuit in files 555 drive 2:
> >
> > http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/555drive2.jpg
> >
> > It was used to drive the three axis of a computer driven water phantom
> > (Xrays) in manual mode, hence the 6 switches. Calls for 15V, but the
> > 12V Zener parts could be pulled out.
>
> My end goal is to have a box with a knob on it. Inside will be a power
> supply, gecko or other stepper controller, and the circuit. I'll need
> to be able to control the motor from a dead stop to maybe 75rpm. This
> will be connected to a motor that will be turning a rotary table which
> will be on a polishing machine.
>
> So, the circuit will need to output square pulses of a certain width
> with control over the time between the pulses. Output should be 5V
> logic. I've got some old drawings I did somewhere around here. I'll
> dig through my notes and see if they still make sense and post something
> to the files are if they do.
>
> I'd like to use the same circuit for bench testing. Every once in a
> while I end up with a few industrial step/direction controllers and it
> would be nice to test them without tearing my machine apart.
>
> Before this gets too off-topic...
>
> Chris