Skip to content
caliperhq

Cycloidal drive reducer

named parts + highlight

Per-part colored cycloidal reducer with named parts + highlight.

Cycloidal drive reducer

What it is

A three-part cycloidal speed reducer: an eccentric input shaft, a cycloidal disc with N-1 lobes, and a fixed pin housing with N rollers. Drive ratio is (N-1):1. The cycloidal profile comes from an analytic parametric equation — small sign or rolling-radius mistakes produce a curve that looks similar but doesn’t mesh.

Why visual feedback matters

This is exactly the kind of design where the perception loop earns its keep: write the profile equation, render it, instantly see whether the curve is a working hypocycloid or a degenerate self-intersecting shape. The four named parts make this the showcase demo for list_parts, highlight, and label_parts.

Screenshots

Cycloidal drive iso view
Iso
Cycloidal drive oblique view
Oblique

Highlighted parts (gray housing, bronze disc, gold input, steel-blue output).

Highlighted disc
Highlight: disc
Highlighted housing
Highlight: housing
Labeled parts
Labeled
Cross-section
Slice (z)
Iteration GIF
Iteration loop

Parameters

Parameters 5
NameDefaultDescription
pinCount 12 Number of pins; reduction ratio = (N-1):1.
eccentricity 1.5 mm How far off-center the disc rides.
discDiameter 60 mm Cycloidal disc diameter.
discThickness 8 mm Disc thickness.
pinRadius 2.5 mm Roller pin radius.

Try it