Maybe I'm wrong, but the caliper method seems more academic than practical to me -- how many of us have calipers that can accurately measure tenths?? The ones I have can display a "5", i.e., .0005", but I take that with a rather large grain of salt.?
But I COULD see some kind of attachment that uses a .0001" DTI.? It could be two pieces that clamp onto the blade.? The DTI would attach to the end of one and the other would have a flat for the DTI to press against.? Since the range for your typical DTI with this resolution is just a few thousandths, you also might want to implement some kind of fine adjustment to make it easier to set up.?
Another approach might be to make a one-piece device with a flexure in the middle -- once you get the DTI set up all you need to do is attach the thing to the blade.? As long as the blade elongation doesn't exceed the flexure's elastic range it should last forever.? I imagine the body of this one might look a bit like a C clamp with a short length of spring steel (old hacksaw blade?) in the middle.
Mark
