5 : 1
5 : 1 · module 2, keyed, 6000 bearings
Module 2 · 20° · spur
A metal-ready 5 : 1: keyed shafts, planets on 6000 bearings, a flanged ring with eight M5 bolts.
Sample · Module 3 · 20° · spur
6 : 1 · module 3 winch drive
A big 6 : 1 for a winch or drum: module 3, a 300 mm ring with twelve M5 bolts.
Build it with your AI
Using the CheapCADTools connector, design a 6 : 1 planetary gear set in Planetary Gear Designer: module 3 mm, 20° pressure angle, spur teeth, a 20-tooth sun, 40-tooth planets and a 100-tooth ring, three planets, a profile shift of 0.2 on the planets, face width 25 mm. The sun: a 14 mm bore with a keyway 5 mm wide and 2.3 mm deep. The carrier's output: a 25 mm bore with a keyway 8 mm wide and 3.3 mm deep. The ring: twelve M5 bolt holes. Set parts in mild steel and the Strength check's sun, planet and ring material to steel, through hardened, grade 1. 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
- 20 teeth · no shift · tip Ø65.97 mm · face 25 mm · bore Ø14 mm, keyway 5 mm wide × 2.3 mm deep · no hub
Planets · 3
- 40 teeth · shift +0.2 · tip Ø127.17 mm · face 25 mm · bore Ø5.3 mm on a Ø5 mm pin · print 3
Ring
- 100 internal teeth · shift −0.4 · outside Ø340.39 mm · rim 15 mm below the roots · 12 × M5 bolt holes Ø5.5 mm on Ø325.4 mm
Carrier
- straddle (two discs and posts) · disc Ø295.4 × 5 mm · 3 pins Ø5 × 36.0 mm · output bore Ø25 mm, keyway 8 mm wide × 3.3 mm deep
The set · Module 3 · 20° · spur
- 6 : 1 reduction: the ring is held, the sun is the input and the carrier the output.
Notes
- Hardware: 3 × planet pin Ø5 × 36.0 mm; 3 × M3 screw, about 11 mm long; 12 × M5 bolt through the ring.
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.
More samples
Related planetary sets
4 : 1
10.24 : 1
10.24 : 1 · two 3.2 : 1 stages
Module 1 · 20° · spur
Two 3.2 : 1 stages with four planets each: about 10 : 1 in a short housing.
6 : 1
6 : 1 · 25° pressure angle
Module 2 · 25° · spur
25° teeth: a 14-tooth sun without undercut and stronger roots, 6 : 1.