Digitizer 3D model images

>Carlos Guillermo wrote
>
>
>Due to the INCREDIBLE volume of traffic regarding digitizers, I
>felt a nagging bug to design one in 3D CAD based on some of what I
>’ve heard here, and a little bit of filling in the blanks. I
>posted a PDF with various views of my design in the files section
>under “digitizer”.

Very well done Carlos! While pondering an inexpensive, reliable
implementation of a digitizing probe I visualized essentially
the same concept but never seem to have the time to draw or
prototype anything. Jon's suggestion that 316 stainless would
be a good material is comforting as it is commonly available
in the forms needed. While a printed circuit board makes for
easy mounting, other home brew solutions should also work well.
I would recommend keeping the sense current through the balls
at 10 to 20 milliamps to help keep oxides from inhibiting the
switch action.

Cheers,
Steve Stallings