On Wed, 16 Jul 2003 21:49:40 GMT, (Gary Coffman) wrote:
On Wed, 16 Jul 2003 13:40:02 -0500, Jon Elson wrote:
If the leadscrew is metric, only, then it gets more difficult. Some
lathes have
transposing gear sets that can be inserted in the gear train to make an
approximate
conversion between metric and imperial threads.

If the transpose gears are 127 tooth and 100 tooth, it isn't an approximation.
It is *exact*. 127x2 is 254 which is the *exact* number of millimeters in an
inch by definition.

Er, ah, decimal point decimal point, but it still is exact.

Gary