am trying to get to grips with my Rocketronics ELS ( threading) there are a few parameters I need to put into the controller before auto threading, pitch (metric ), ( if imperial tpi convert to metric) length of thread, depth of cut, angle of cut, it’s the depth of thread I am having trouble with, a google search turns up 6 or more formulas for working out, same on YouTube so I am totally confused ( not difficult at my age ) , if it wasn’t auto threading it would be a trial & error method cut try a nut cut and so on, I am sure someone on here will have a definitive answer.

Some of the clocks pre 1900 I do the manufacture had there own thread forms and they were made using thread plates and although I have some they don’t cover all manufacturers, it would be nice to also be able to work out a way to find the pitch and form of them as well , I know I can use a pitch gauge to find something near but is there a formula for doing it, for example did they all use tpi per inch or something else.

thanks Dell