Kirk Wallace wrote: > On Mon, 2008-07-28 at 00:33 -0500, Jon Elson wrote: > ... snip > >>you might be >>able to cobble up a substitute by making a disc with a narrow >>slot and one of those U-shaped optical sensors from a floppy drive. > > > I have thought about this, but I wonder how accurate these are. If you > want to resolve .0002", I think you typically need angular accuracy > to .16 degrees. I guess I could try it to find out. > I came up with .36 degrees. A good-sized disc with a narrow-enough slot should work. Basically, you are making a 1000 line resolution encoder, but with only one line.
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