Re: [CAD_CAM_EDM_DRO] Re[2]: digitising arm

Ian Wright wrote:

> Then we could use the Xtal as the
> resonant element in a simple oscillator and monitor the change in frequency
> as the Xtal deformed under side loading and have a logic circuit to trigger
> at a certain deviation thus indicating contact with the surface. In
> principle it looks as though this could be very accurate as a very small
> change in frequency could be detected.

I think you are going to get a few pf change from capacitive coupling to the object as you approach it. If this really happens
then it might be a very sensitive probe.

Dave