Grooved heart cam (face cam) with roller follower — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/grooved-heart-cam-mechanism/  (CC BY 4.0)
Basis: Xem Studio design following Brown No. 97 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- A groove cut in the face of a disc holds the follower's roller between two walls, so the cam drives it both out and back (positive drive, no return spring). The heart-shaped centre line gives uniform speed: 20 mm out over half a turn, 20 mm back.
- Drawn at 60°: roller centre 26.67 mm from the axis, touching one wall (contact only).
- Brown's No. 97 (grooved heart cam, a variant of No. 96).
- Parts (each has its own page): grooved-heart-cam-r20-h20, roller-follower-10, cam-follower-bar-roller-pin, dowel-pins-metric.
- Brown's movement No. 97 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
groove centre line  R20 → R40 → R20
roller  Ø10 × 4 (roller-follower-10)
stroke  20 mm
motion  uniform velocity

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 97: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_097.html

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/grooved-heart-cam-mechanism/index.json
API: https://xemstudio.com/api/geometry?object=grooved-heart-cam-mechanism