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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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