A prototypegearbox design that combines planetary and strain wave gearing to create a multi-material 3D printed reduction drive that is compact while providing very high gear ratios for high torque applications.
If you would like to support this project you can boostthis model to help fund further development and testing. Any support is greatly appreciated!
Features
High positional accuracy with virtually zero backlash
Two-speed compound gearbox design
Capable of being driven by either the sun gear or planet carrier
Modular design made for 3D printing and easy assembly
Quickly experiment with new materials and processes
Custom print profile and STEPfiles for accurate functional prints
Build plates separated by component and material capability
Specifications
Planetary gearing with ratio of 4:1
32 tooth sun gear, planet gears offset by +/- 2teeth
Strain wave gearing with ratio of 40:1
80 tooth flex spline, 82 tooth ring gear
2 mm flex spline wall thickness
Integrated 2 degree planetary gear bevel allows flex spline to bend more naturally
Outer dimensions: 74 mm x 100 mm x 100 mm
Housing can be mounted with eight M3 screws (49mm radius)
Component
Gear Ratio
Driver or Mounting
Input
Sun gear
160:1
6 mm hex
Input
Planet carrier
40:1
four M3 screws (r = 16mm)
Output
Flex spline (cap)
n/a
six M3 screws (r = 17.5mm)
Output
Flex spline (through-bolt)
n/a
six M3 screws (r = 24mm)
Assembly
Printed Parts
Planetary Gears
SunGear.step (1x)
SunGearPost.step (1x)
MajorPlanetGear.step (2x)
MinorPlanetGear.step (2x)
CarrierFront.step (1x)
CarrierBack.step (1x)
CarrierSpacerFront.step (1x)
CarrierSpacerBack.step (1x)
Flex spline
FlexSpline.step (1x)
FlexSplineCore.step (1x)
FlexSplineCap.step (1x)
Housing
HousingBody.step (1x)
HousingCover.step (1x)
Hardware
M3x16mm Socket Head Cap Screw (1 pcs)
M3x20mm Socket Head Cap Screw (6 pcs)
M3x35mm Socket Head Cap Screw (12 pcs)
MR106-2RS Deep Groove Ball Bearings 6mm x 10mm x 3mm (8 pcs)
608-2RS Ball Bearings 8mm x 22mm x 7mm (2 pcs)
6806-2RS Deep Groove Ball Bearings 30mm x 42mm x 7mm (1 pcs)
6812-2RS Deep Groove Ball Bearings 60mm x 78mm x 10mm (2 pcs)
Brent Peterson
