# Grooved heart cam (face cam), uniform motion, 20 mm stroke

> What is a grooved heart cam?

- Category: Hardware › Mechanism parts
- Kind: Modern device
- Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
- Page: https://xemstudio.com/objects/grooved-heart-cam-r20-h20/ · JSON: https://xemstudio.com/api/geometry?object=grooved-heart-cam-r20-h20 · Plain text: https://xemstudio.com/objects/grooved-heart-cam-r20-h20/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 102.0 | 102.0 | 10.0 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Ø92 × 10 disc with a 10 mm wide, 6 mm deep groove in its face: the groove's centre line is a heart (radius 20 → 40 mm over 180° and back), so a Ø10 roller in it is driven both ways — no spring needed. Ø5 bore.
- Groove walls are the centre line offset ±5 mm (the roller radius); uniform speed out and back, reversing at the cusps.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| disc | Ø92 × 10 mm |
| groove | 10 wide × 6 deep |
| stroke | 20 mm, uniform velocity |
| bore | Ø5 |

## Where the files are

- Henry T. Brown (1868, public domain): [Five Hundred and Seven Mechanical Movements — scan on archive.org](https://archive.org/details/fivehundredseven00browiala) — web — Publisher's page; dimensions are facts
- 507movements.com: [Brown's movement No. 97: figure, his text and an animation](https://507movements.com/mm_097.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/grooved-heart-cam-mechanism/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/grooved-heart-cam-r20-h20/index.json

- grooved-heart-cam-r20-h20: [STEP](https://xemstudio.com/files/hardware/grooved-heart-cam-r20-h20/grooved-heart-cam-r20-h20.step) · [STL](https://xemstudio.com/files/hardware/grooved-heart-cam-r20-h20/grooved-heart-cam-r20-h20.stl) — face cam, groove on the top face

## Questions

**What is a grooved heart cam?**

Ø92 × 10 disc with a 10 mm wide, 6 mm deep groove in its face: the groove's centre line is a heart (radius 20 → 40 mm over 180° and back), so a Ø10 roller in it is driven both ways — no spring needed. Ø5 bore.

## Fits with

- [Grooved heart cam (face cam) with roller follower](https://xemstudio.com/objects/grooved-heart-cam-mechanism/)