Re: [CAD_CAM_EDM_DRO] Re: joystick control two axis stage (More)

I built one using a 555 timer and a switched joy stick in place of the
pots.
I used a 74hct04 to detect the direction. I had a step form the 555 and dir
form the 74hcto4. speed was a separate control. Very simple.
Jim

----- Original Message -----
From: "caudlet" <info@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, March 07, 2004 1:30 PM
Subject: [CAD_CAM_EDM_DRO] Re: joystick control two axis stage (More)


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ibewgypsie"
> <ibewgypsie@h...> wrote:
> > Looks pretty indepth. A Basic stamp using the "pot" command, calling
> > the step pulses "Low" and setting direction pins on Gecko drives.
> I'd
> > of course use tried and proven drives like geckos if you are
> > unfamiliar "start with a proven product".
> >
> > Pretty simple stuff. One chip replaces a whole breadboard of them.
> > Software is the hard part. I too have thought of this to replace the
> > Joystick program I have for Windows 98. Then I would not have to
> boot
> > the computer on the cnc. You are welcome to a copy of that program,
> > that with computer, a hex inverter to change positive logic on the
> > parallel port to negative logic and you'd be set to hook up Geckos.
> >
> > I have a board I have put together, predrilled for geckos wired with
> > hex inverter chip, and opto-22. I can send you a drawing if you
> like.
> >
> > My cnc machine runs with 8 amp Larken drives. Ran for a year with
> geckos.
> >
> > My cnc program to drill backplane, would that be a help to others to
> > post it here?
> >
> > David
> >
> >
> >Interesting. How do you develop the direction off the pot to the
> AtoD section of the micro? One other thing is you need a "dead zone"
> in the middle of the control. A point below where you get zero pulses
> so the unit doesn't creep on you. You cannot depend on the joystick
> to be precisely centered. The pulse range needs to be in the range
> of a 1000:1 for it to be usable and you need to provide for ramp up
> and down,or the steppers will never reach close to their upper RPM.
> Like you say the devil is in the programming.
>
> If I were going to be the circuit commercially I would consider the
> PIC or STAMP (maybe even 68HCXX series) but for one, the time to
> right, troubleshoot and build an embedded micro solution cancels any
> advantage in parts count and board size.
>
>
>
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