"Andrew VK3BFA" wrote in message
oups.com...
snip----

Still dont know what an
ACME thread is. Have a small Unimat lathe

If your Unimat has a lead screw, chances are good it is an Acme thread.
The thread has an included angle of 29 degrees, and the root and crest is
flat.

Harold

Merry Christmas! (Or should that be Happy Holidays?) g