Hi, does anyone know of detailed plans for the construction of a digital touch probe ? Have seen plans on the web but I want detailed drawings as just don`t have the time ( or inclination  ) to develop as I go along.
Thanks

There is a set on this forum look under documentation.

(;-)TP

http://www.machsupport.com/docs/SW_Digitising_Probe.pdf

Looks like it should work.

I'm designing my own with an overtravel switch which will kill movement by triggering the limit circuit.

Probing and overtravel need two conductors each in the cable, I would suggest using a six-pin connector at the machine and fitting a dummy connector to it when not in use. The dummy connector has all three pairs shorted (1 to 2,  3 to 4 and 5 to 6) to enable normal operations. pair 5-6 enables the spindle and the probe's cable has these permanently open to prevent the spindle running when the probe is attached. This is my strategy. If and when I get the thing developed fully I'll share the results here.