# Flat-faced cam follower, 40 mm face, 8 mm stem

> What is a flat-faced follower?

- 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/flat-face-follower-40/ · JSON: https://xemstudio.com/api/geometry?object=flat-face-follower-40 · Plain text: https://xemstudio.com/objects/flat-face-follower-40/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 |
|---|---|---|
| 40.0 | 60.0 | 6.0 |

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

## Notes

- Follower with a 40 × 4 mm flat face square to its 8 × 6 mm stem (60 long): contact moves across the face by ds/dθ, so the face must be wider than twice the largest ds/dθ (here 2 × 11.5 mm).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| face | 40 × 4 mm |
| stem | 8 × 6 mm |
| length | 60 mm |

## 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. 138: figure, his text and an animation](https://507movements.com/mm_138.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/plate-cam-flat-follower-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/flat-face-follower-40/index.json

- flat-face-follower-40: [STEP](https://xemstudio.com/files/hardware/flat-face-follower-40/flat-face-follower-40.step) · [STL](https://xemstudio.com/files/hardware/flat-face-follower-40/flat-face-follower-40.stl) — follower, face at y = 0

## Questions

**What is a flat-faced follower?**

Follower with a 40 × 4 mm flat face square to its 8 × 6 mm stem (60 long): contact moves across the face by ds/dθ, so the face must be wider than twice the largest ds/dθ (here 2 × 11.5 mm).

## Fits with

- [Plate cam with flat-faced follower (constant acceleration (parabolic) rise)](https://xemstudio.com/objects/plate-cam-flat-follower-mechanism/)