Re: [CAD_CAM_EDM_DRO] Renishaw, digitizers

Jon,

Good drawing!

I see what a Heim is now. A ball joint. The program I'm working on
(first) is a simple controller. Later I might write a program
specifically for scanning.

The program uses MaxNC's parallel port pinout (step/dir is better), and
pin 13 is an input signal (Select). Driving it from a mechanical switch
shouldn't be a problem, a 1k pull-up resistor might be used, the signal
would then go HI when the circuit opened.

Can your probe be made small enough for a sherline?

Alan KM6VV

Jon Anderson wrote:

>
> Alan,
>
> I drew up my idea and posted to my web site.
>
> http://www.prototype-design.com/images/probe.gif
>
> is the link, it's a 9k file. I didn't spend a whole lot of time on it
> since right now I'm just trying to convey the concept.
> All I would want from this is that the probe tip returns to a repeatable
> position. Given the overall accuracy I can expect in actually machining
> patterns on a cnc knee mill, if the probe returned to .001 I'd be happy
> since I'll be doing 1/2 scale or smaller.
>
> The way I had my mill wired before, switching to another software
> package to drive things would have been a bear. Have just finished the
> driver cabinet and I have step/dir input for the drivers going to a DB
> connector, which will go to my (yet to be built) I/O cabinet where it
> will connect to the Ahha breakout board. So now I could just disconnect
> that cable and hook up a cable from the parallel port, and move the
> axis. Would be nice to be able to run both programs on the same PC!
> Would your software work on a simple contact closure for input, or would
> a circuit be needed to generate a 5v signal?
>
> Jon
>
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