Sample · module 1 · 20°

18T in a 72T ring · 4 : 1

An internal (ring) gear and its pinion: compact, both turning the same way.

Rings & racks18 in 72

Build it with your AI

Using the CheapCAD Tools connector, design a pinion and ring gear drive in Gear Designer: module 1 mm, face width 8 mm. Gear 1: 18 teeth, profile shift x = 0.1, a 5 mm bore, D-flat 0.5 mm deep. Gear 2: 72 teeth, an internal (ring) gear, profile shift x = -0.27, rim outside diameter 84 mm. Check the design, apply any Auto-fix it suggests, then export both gears as STL and give me the download link.

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

What's in this design

Gear 1 · 18 teeth

18T gear · tip Ø20.2 mm · x = 0.1 · bore Ø5 mm D-flat

Ring gear · 72 teeth

72T ring gear · rim Ø84 mm · x = -0.27

The mesh · module 1 · 20°

ratio 4 : 1 · centre distance 27.17 mm · contact ratio 1.78 · backlash 0.124–0.234 mm

The link opens both parts in the Gear Designer's 3D Mode. Change the teeth, module or pitch, bore, hub or spokes, then download STL, STEP, DXF or SVG.

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