• Try RUN if you want to see what the program does.
• Click DRAW to see a scale drawing of gear train.
• Any problems? Watch the tutorial videos shown below.
• Return to the MENU. Look through all the options.
• Enter your own data in steps 1-5 then RUN.

• Step 1: Choose the brand of your lathe.
• Step 2: Enter the gears you own for the gear train.
• Step 3: Choose what you want to calculate
• Step 4: Enter the % error you are willing to accept.
• Step 5: For threads use ONE pitch entry method:
• Step 5A just enter the pitch or TPI, then RUN
• Step 5B produces a table for multiple thread sizes,
• Step 5C Use standard thread tables (eg UNF).
• Step 6: Click RUN to execute the program.
• Return to menu to alter one or more items,
eg change the acceptable error.
• RUN again.

See the orange buttons for additional apps that do not require lathe data. e.g. Extensive data on threads and drill sizes for tapping. New versions uploaded in 2022: 28 Jan, 6 Feb, 14 Mar, 21 Mar, 11 Apr.1 May.