Re: Scanner/Digitizer skip function/probe details?

Hi Ballendo!

Some comments below:

ballendo@... wrote:

>
> Alan M wrote:
> >Curious, I wonder what Otto did, build a library? a TSR?
> >I'll try to contact the Motion Group.
>
> Alan,
>
> To be quite honest, I got tired of trying to get an answer to my
> questions from Otto, so I don't know what he used for 'hooks'. Dave
> Downs used to be the hardware guy at TMG. Good luck.
>
> >Can give me a snippet of gcode to demo these two commands? So any
> >gcode program SHOULD be able to digitizing? I saw a line marked
> >M61 on the MaxNC interface, might have been a typo.
> > G61 X 1.0 Y 0.0
> > G31 ?
>
> Yes,but. That would be correct for any gcode control program written
> to support the 'skip' function. The 'skip' function of Gcode is a
> linear interpolated move. So just think of writing a G01 type
> command. The DIFFERENCE IS, if the input bit being 'watched' (by the
> control) changes state, the motion stops immediately! So
> the 'destination' of the skip command coords need to be far enough
> into the part being digitised to assure contact. The skip function
> will cause a control alarm if the coords are reached WITHOUT 'inout
> at the skip bit'.
>
> G31 x5y3z-1
>
> Most commercial controls have user- accessible variables which
> include the current coordinates. 'Reading' these coords to a file
> completes the act of digitising.
>
> >From memory, I don't know if the MaxNC code is G61, M61, or something
> else...

Well, now that I have a clue, I can test it. AND/OR, I can incorporate
it in my controller. I have been thinking of adding variables. NIST
uses #nnn for a variable name. Not very intuitive (no disrespect
intended as I admire the efforts of NIST; but variable NAMES are a lot
easier to work with). CNCpro has variables, might be same/similar.
What's the standard (ha)? I'm inclined to "do my own", you know how us
programmer types are. ;>)

>
> >We never did come up with a digitizer design! You mean we have to
> >BUY one?
> >Alan
>
> I would love to see the list share thoughts on a digitising probe.
> Both by explaining what's out there and how it works (MaxNC, Larken,
> Renishaw, Roland picxa, etc.) and then by working to create a probe
> we all could build!?!

Sounds like MaxNC's spindle taper is different then Sherline's. Unless
their probe comes apart! That's twice I've heard the name Renishaw, the
others I kinda know a little.

Alan KM6VV

>
> Hope this helps.
>
> Ballendo
>
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