Planetary Gear Set (12T Sun, 9T Planets, 30T Ring)
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Educational planetary gear model with 12T sun, 9T planets, 30T ring. Learn gear ratios and mechanics.
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Model information
- Source
- Printables
- Category
- Engineering
- License
- Creative Commons — Public Domain
This model is a planetary gear system designed for learning and experimentation.
It demonstrates the mechanics of an epicyclic gear train with the following parameters:
Sun gear: 12 teeth
Planet gears: 9 teeth each
Ring gear: 30 teeth
Module: 2.083 mm
Pitch diameter (sun): 25 mm
Pressure angle: 20°
Backlash: 0.05 mm
Gear Ratio Calculation:
Planetary gear ratio formula:
Ratio = 1 + (N_ring / N_sun)
Then:
Ratio = 1 + (30 / 12) Ratio = 1 + 2.5 Ratio = 3.5 : 1
This means the carrier rotates at 1/3.5 of the sun gear speed when the ring is fixed.
Perfect for students, hobbyists, and engineers interested in gear mechanics and motion transfer.
👉 View the design on Onshape:
Onshape Project Link