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- Extruder screw pitch: 8mm
- Threaded rod pitch: 1.5mm (M10)
- Gear ratio: 8/1.5 = 16/3 = 144/27
- Chuck pulley: 144 teeth
- Threaded rod pulley: 27 teeth
Calculation of pitch angle
The pitch angle of the screw to be made is equal to the angle the grinding wheel needs to be rotated
- Extruder screw pitch p=8mm
- Extruder screw diameter d=12mm
- tan(α)=p/(d*π)
- tan(α)=8mm/(12mm*π) → α = 11.98°
Angle Grinder
The original design uses this 4-1/2" battery-powered angle grinder: https://www.milwaukeetool.com/Products/Power-Tools/Metalworking/Grinders/2680-20
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