On 3/3/2010 00:00, Don Foreman wrote:

Put a sharp V threading bit in the toolholder and stick a DI on the
bed with a magnet or whatever. Visually align the point of the bit
with the crest (or the edge of a crest) of a spindle thread using a
10X loupe. Zero the DI that's tracking the carriage. Advance one
thread, optically aligning the point of the bit with the next crest.
Read the DI. You should now know the pitch to within a couple of
thou. You can measure the OD with a mike and the pitch dia with three
wires and a mike.

Don, you were helpful. Better quit that before you get into trouble...

Didn't think of measuring the crest to crest distance that way. I do
have a Mighty Mag not doing anything... Never used my Pee Dee thread
wires since shop operations 1 back in 96... Tried thread triangles last
night, and it didn't come up with a reasonable result.

OD has been determined with a digital caliper, multiple times.

To do list:

Measure crest to crest distance
Dust off thread wires and determine pitch diameter

Last step is drink heavily...

Grizzly answered back, they are researching it...