Standard for spindle nose thread

[TomG]

Darren,

It sounds like a lot of work to make a thread gauge that large for a one time use. Why not just make a rod with a 60º point on each end to use as a gauge. You could size it to the pitch diameter of the thread in your 4-jaw or face plate. As a final check, you could unscrew the chuck and check the fit of the newly cut thread before removing it from the chuck.

Tom