Change gear calculator

This is an online calculator to calculate what change gears to use to generate a specific thread for an imperial leadscrew lathe.

The available gears are given as a comma separated list of integer values (For example, if your gears have 11, 12 and 15 teeth, enter "11, 12, 15" in the textbox below).

The program will generate both simple and compound gear trains. Some lathes don't support one or the other, so your mileage may vary