Hi,
Great thread. Have to build one of these (have to finish the CNC Router first though).
Any suggestions on a probe material for use on sensitive objects that you wouldn't want damaged. By this I mean an antique made of soft wood with a varnish finish that you definitely would not want any scratches or other damage to appear on.
I would guess that a probe with a rounded, or even flat, tip could be fashioned out of some self lubrication plastic like HDPE. Or even a HDPE ball attached to the end of the metal probe may work.
If you cut it to small you can always nail another piece on the end, but if you cut it to big... then what the hell you gonna do?
Steven