Involute spur gears by module and number of teeth.

How to use
  1. 1Set the number of teeth and the module (tooth size).
  2. 2Add a second gear to see a working pair and the center distance.
  3. 3Set the shaft hole and download.
FAQ
What is the module?
Tooth size in mm: pitch diameter = module × teeth. Gears must have the same module to work together.
The gears are too tight.
Increase the backlash to 0.2–0.3 mm.
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