threads on a lathe

[mklotz]

I have a question does anyone have a chart to tell you how deep to cut threads when threading thanks

We don't need no steenkin' charts.

The depth of thread (DOT), sharp tip to sharp root, for a 60 degree thread (e.g., SAE and metric) of pitch P is given by...

DOT = sqrt(3) * P / 2 = 0.866 * P

although, if you're doing precision work, you'll want to learn to use thread wires.

If you angle the compound, as some do, remember to account for that when translating this DOT into compound infeed.

Or, get the full picture - download my program, DOT, from my website and it will do all the dirty work for you.