Solar arrangement · overdrive

Sun held, carrier in, ring out: the ring overruns the input, like a car's overdrive.

Demo sets & desk toys1 : 1.33 planetsSun heldOverdrive

Build it with your AI

Using the CheapCADTools connector, design a 1 : 1.3 overdrive planetary gear set in Planetary Gear Designer: module 2 mm, 20° pressure angle, herringbone teeth, an 18-tooth sun, 21-tooth planets and a 60-tooth ring, three planets, a profile shift of 0.2 on the planets, face width 12 mm, the sun held and the carrier as the input, so the ring is the output. The sun: an 8 mm bore. The carrier's output: an 8 mm bore. Check the design, apply any Auto-fix it suggests, then export every part (the sun, a planet, the ring and the carrier) as STEP and STL and give me the download link.

Paste it into Claude, ChatGPT or any AI app with the CheapCADTools connector, and it designs this planetary set with you, checks it and hands you the files. How to connect your AI.

What's in this design

Sun

18 teeth · no shift · tip Ø41.24 mm · face 12 mm · bore Ø8 mm · no hub

Planets · 3

21 teeth · shift +0.2 · tip Ø48.26 mm · face 12 mm · bore Ø5.3 mm on a Ø5 mm pin · print 3

Ring

60 internal teeth · shift −0.4 · outside Ø151.11 mm · rim 10 mm below the roots

Carrier

straddle (two discs and posts) · disc Ø120.83 × 5 mm · 3 pins Ø5 × 23.0 mm · output bore Ø8 mm

The set · Module 2 · 20° · herringbone

1 : 1.3 overdrive: the sun is held, the carrier is the input and the ring the output, 1.3 times as fast.

Notes

Hardware: 3 × planet pin Ø5 × 23.0 mm; 3 × M3 screw, about 11 mm long.
The Strength check rates spur sets only: helical and herringbone sets aren't rated yet.

The link opens the whole set in the Planetary Gear Designer's 3D view. Change the teeth, the number of planets or stages, which member is held, the carrier, bores or hubs, then download STL, STEP or the carrier's DXF and SVG.

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