Spur Gears
![](http://tech.gpvanier.ca/wp-content/uploads/2020/07/Spur-Gear-Assembly-1024x791.jpg)
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.
![](http://tech.gpvanier.ca/wp-content/uploads/2020/11/Square-Shafts-1024x791.jpg)
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.
![](http://tech.gpvanier.ca/wp-content/uploads/2020/11/Common-Sizes-1024x791.jpg)