# Roller-follower fork rod, 8 × 6 mm, for a Ø10 roller on a Ø3 pin

> What is a roller follower rod?

- 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/roller-follower-fork-rod-8/ · JSON: https://xemstudio.com/api/geometry?object=roller-follower-fork-rod-8 · Plain text: https://xemstudio.com/objects/roller-follower-fork-rod-8/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 |
|---|---|---|
| 14.0 | 75.0 | 10.0 |

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

## Notes

- 8 × 10 mm rod ending in a clevis: two 2 mm cheeks, 6 mm apart (the cam's thickness), pass above and below the cam and carry a Ø3 pin on which the Ø10 × 4 roller turns in the cam's plane.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| rod | 8 × 10 mm, 60 long |
| cheeks | 2 mm, 6 mm apart |
| roller | Ø10 × 4 (roller-follower-10) |
| pin | Ø3 |

## 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-roller-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/roller-follower-fork-rod-8/index.json

- roller-follower-fork-rod-8: [STEP](https://xemstudio.com/files/hardware/roller-follower-fork-rod-8/roller-follower-fork-rod-8.step) · [STL](https://xemstudio.com/files/hardware/roller-follower-fork-rod-8/roller-follower-fork-rod-8.stl) — fork rod, roller centre at y = 0

## Questions

**What is a roller follower rod?**

8 × 10 mm rod ending in a clevis: two 2 mm cheeks, 6 mm apart (the cam's thickness), pass above and below the cam and carry a Ø3 pin on which the Ø10 × 4 roller turns in the cam's plane.

## Fits with

- [Plate cam with roller follower (cycloidal rise)](https://xemstudio.com/objects/plate-cam-roller-follower-mechanism/)