# Uniform-motion yoke plate 60 × 40 × 8 with closed channel for a 12 mm crank

> What is a uniform-motion crank channel?

- 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/uniform-motion-yoke-plate-60x40-r12/ · JSON: https://xemstudio.com/api/geometry?object=uniform-motion-yoke-plate-60x40-r12 · Plain text: https://xemstudio.com/objects/uniform-motion-yoke-plate-60x40-r12/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 |
|---|---|---|
| 60.0 | 40.0 | 8.0 |

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

## Notes

- 60 × 40 × 8 plate with a closed 3 mm channel through it whose centre line is the crank-pin path drawn in the plate's own frame when the plate moves at constant speed: x = r cos θ − X(θ), y = r sin θ with X(θ) linear in θ (24 mm out over half a turn, back over the other half). Two Ø5 bores along X (y = ±17) for the guide pillars.
- The channel is a rounded diamond, 51 × 27 mm over its walls; the pin changes direction at the two pointed ends.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| plate | 60 × 40 × 8 mm |
| channel | 3 mm wide, closed loop 51 × 27 |
| crank radius | 12 mm |
| guide bores | 2 × Ø5 at y = ±17 |

## 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. 354: figure, his text and an animation](https://507movements.com/mm_354.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/uniform-motion-crank-yoke-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/uniform-motion-yoke-plate-60x40-r12/index.json · license: https://xemstudio.com/files/hardware/uniform-motion-yoke-plate-60x40-r12/LICENSE.md

- uniform-motion-yoke-plate-60x40-r12: [STEP](https://xemstudio.com/files/hardware/uniform-motion-yoke-plate-60x40-r12/uniform-motion-yoke-plate-60x40-r12.step) · [STL](https://xemstudio.com/files/hardware/uniform-motion-yoke-plate-60x40-r12/uniform-motion-yoke-plate-60x40-r12.stl) — plate, z 0..8, bores along X

## Questions

**What is a uniform-motion crank channel?**

60 × 40 × 8 plate with a closed 3 mm channel through it whose centre line is the crank-pin path drawn in the plate's own frame when the plate moves at constant speed: x = r cos θ − X(θ), y = r sin θ with X(θ) linear in θ (24 mm out over half a turn, back over the other half). Two Ø5 bores along X (y = ±17) for the guide pillars.

## Fits with

- [Crank with closed channel yoke (uniform-speed reciprocation)](https://xemstudio.com/objects/uniform-motion-crank-yoke-mechanism/)