Re: Scanner/Digitizer skip function/probe details?

Dave,

Yes, I was thinking about that, an encoder wheel on a dial indicator, or
a photo-interrupter actuated by a vane (needle) moved by a contact. Or
strain guages. What I haven't figured out is how to get 3D. 2D from
the strain guages, but 3rd is tough. Maybe if object was on a rotary
table (C axis), then we could approach in more limited directions? Any
ideas?

I'm thinking each G61 move "collects" a data point, and they are saved
in .DLG format (Digital Line Drawing), .DEM (Digital Elevation Map),
.DXF or Gcode.

Alan KM6VV

dave engvall wrote:

>
> ballendo@... wrote:
>
> > 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!?!
> >
> > Hope this helps.
> >
> > Ballendo
> >
>
> Disclaimer: this is just concept (theory) and there is a large gap between ideas and realization. :-)
>
> I think Alan said something about using a dial indicator to sense Z. If this has a sensor (switch, optical, etc. ) on the needle
> then contact is indicated (pun intended) by movement of the needle. One stores x, y, and z in an array and then post-processes to
> correct sensed postion to real position: much in the same manner as one computes the position of contact for a ball end mill when
> cutting surfaces in Z.
> Hope this makes sense. :-O
>
> Dave