Spur Gears

Note: This tutorial uses a 1.5mm module (tooth size) and 3.0mm clearance holes for M3 screws. The SUPERSPEED-660 has a larger kerf, and requires a 2.0mm module and 2.8mm clearance holes.

In Design Accelerator, choose to calculate Number of Teeth to keep the Ratio and Centre Distance fixed while changing the Module to 2.0mm.

Cutting Circle Holes for Square Axles Using Laser

3mm x 3mm square axles will spin freely in holes that are designed with a 4.1mm diameter.

4.0mm holes will work for a tighter fit, but may require you to file down the edges.