"Jim Wilkins" wrote in message news
"Bob La Londe" wrote in message
news
I need to machine some metric trapezoidal threads. Both internal and
external.

What's the best way to do that?

Is hand grinding the tools going to be my best approach? I think maybe it
is since they are for making molds of two mating parts. The molds can't be
of the exact thread forms or the parts won't fit together. A proper
cutting tool for those threads might not produce what I need. I'm still
thinking my way through the process.

A local vendor who has closed sold me an imported 3-axis angle vise
like this that I use to surface-grind angular and trapezoidal
threading and spline milling bits.

http://www.wikiwand.com/en/Tool_and_cutter_grinder

*****************

The link brings up a CNC tool grinder. If that's what he gave you.... WOW!
I'm impressed.

You reminded my I have an antique (its so old the cords have cloth wrap)
basic tool grinder on the shelf that I saved from going into the dumpster on
a house clean out from a hoarder who passed on. Its halfway apart and
needs to be taken all the way apart, but it might just be a good project to
move up the projects board.