18T : 60T · 20 DP on ½" hex
20 DP · 20°
A 3.33 : 1 robot gearbox stage: 20 DP gears on ½" hex shafts, held by retaining rings.

Quiet, thrust-free herringbone gears for a robot joint: 3 : 1 on 8 mm D-flat shafts.
Using the CheapCAD Tools connector, design a two-gear drive in Gear Designer: module 1.5 mm, herringbone, helix angle 30°, face width 12 mm. Gear 1: 16 teeth, an 8 mm bore, D-flat 0.5 mm deep. Gear 2: 48 teeth, an 8 mm bore, D-flat 0.5 mm deep, spokes: 5 of them, Hub OD 20 mm, Width 5 mm, Rim Depth 7 mm, Fillets 3 mm at the rim and 3 mm at the hub. 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.
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.
20 DP · 20°
A 3.33 : 1 robot gearbox stage: 20 DP gears on ½" hex shafts, held by retaining rings.
20 DP · 20°
A 6 : 1 arm reduction: a pinion on an 8 mm keyed motor shaft into an 84-tooth, six-spoke gear on ½" hex.
module 1 · 20°
A 3 : 1 printed reduction for a NEMA 17 stepper: the pinion on its 5 mm D-flat shaft.
module 1 · 20°
An extruder's 5 : 1 reduction: a 16-tooth pinion, profile-shifted so it isn't undercut.