# Rod guide 20 × 20 × 18 with an 8 × 8 slot

> What guides the yoke's 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/scotch-yoke-rod-guide-8x8/ · JSON: https://xemstudio.com/api/geometry?object=scotch-yoke-rod-guide-8x8 · Plain text: https://xemstudio.com/objects/scotch-yoke-rod-guide-8x8/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 20.0 | 20.0 | 18.0 |

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

## Notes

- Block with an 8 × 8 slot through it, aligned with the yoke's rod: keeps the yoke moving on a straight line.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| block | 20 × 20 × 18 |
| slot | 8 × 8 |

## 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. 93: figure, his text and an animation](https://507movements.com/mm_093.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/scotch-yoke-crank-mechanism/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/scotch-yoke-rod-guide-8x8/index.json · license: https://xemstudio.com/files/hardware/scotch-yoke-rod-guide-8x8/LICENSE.md

- scotch-yoke-rod-guide-8x8: [STEP](https://xemstudio.com/files/hardware/scotch-yoke-rod-guide-8x8/scotch-yoke-rod-guide-8x8.step) · [STL](https://xemstudio.com/files/hardware/scotch-yoke-rod-guide-8x8/scotch-yoke-rod-guide-8x8.stl) — as drawn in the mechanism's own frame

## Questions

**What guides the yoke's rod?**

Block with an 8 × 8 slot through it, aligned with the yoke's rod: keeps the yoke moving on a straight line.

## Fits with

- [Crank pin in a slotted yoke (Scotch yoke)](https://xemstudio.com/objects/scotch-yoke-crank-mechanism/)