Cycloidal Drive for NEMA17 Stepper Motor

• 240915 Ratio 11:1 update for NEMA17 22mm shaft
  • cycloidal disk height 8mm
  • rollers 3x25mm
  • height of the reducer 30mm
• 240909 Revised for Ratio 11:1
• 240908 Initial package of ratio 19:1

Design Parameters for Ratio 11

• Number of rollers: 12
• Eccentricity: 0.5mm
• Roller diameter: 3mm
• Roller circle diameter: 30mm
• Pressure angle limit: 50 deg
• Pressure angle offset: 0.1mm

Design Paramters for Ratio 19

• Numer of rollers: 20
• Eccentricity: 0.5mm
• Roller diameter: 3mm
• Roller circle diameter: 32mm
• Pressure angle limit: 50 deg
• Pressure angle offset: 0.0mm

Parts

• Bearing: MF128ZZ x 5, Nominal d8D12H3.5 vs. measured 7.92x11.93x3.41mm
• Roller: D3x25mm x (12+6), measured D2.93x24.70mm

Design Software

• FreeCAD 0.21.2
• FreeCAD_Assembly4
• FreeCAD_FastenersWB