Couple of ideas from outside the box:
1. Put a GPS reciever in the anvil and another one in the screw. Feed the
signals to a PC to compute the diference.
2. Use an ultrasonic transducer coupled to something like a Time Domain
Reflectometer (TDR). Now you can read the thickness without having access to
the other side. Or maybe you can read the thickness of an anodize treatment.
3. Use a scale similar to what is inside a digital caliper and have the
traveling part of the micrometer something like a lever-actuated tailstock
on a lathe.

I also like the "talking micrometer" already mentioned. How about a
micrometer that reads out in braile?

Bruce


"Ben Nguyen" wrote in message
m...
Im looking for ideas to do for a school project and came up with
a digital micrometer.

Does anyone know whats involved? I want something challenging, but not
something impossible!

Thanks!