# Mangle-wheel pinion, 9 teeth, for Ø4 pins on R40 (cut for both sides of the pin row)

> What shape are the teeth of a mangle pinion?

- 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/mangle-pinion-9t-for-pins-r40/ · JSON: https://xemstudio.com/api/geometry?object=mangle-pinion-9t-for-pins-r40 · Plain text: https://xemstudio.com/objects/mangle-pinion-9t-for-pins-r40/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 |
|---|---|---|
| 28.18 | 28.53 | 8.0 |

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

## Notes

- 8 mm pinion, pitch radius 12 mm (9 teeth to the wheel's 30 pin positions), Ø6 bore. Its tooth spaces are the envelope of the Ø4 pins as it rolls both outside the pin circle (centres 52 mm apart) and inside it (28 mm), so it clears the pins in either mesh.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| teeth | 9 |
| pitch radius | 12 mm |
| tip Ø | 28.6 mm |
| bore | Ø6 |
| thickness | 8 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. 36: figure, his text and an animation](https://507movements.com/mm_036.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/mangle-wheel-and-pinion-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/mangle-pinion-9t-for-pins-r40/index.json · license: https://xemstudio.com/files/hardware/mangle-pinion-9t-for-pins-r40/LICENSE.md

- mangle-pinion-9t-for-pins-r40: [STEP](https://xemstudio.com/files/hardware/mangle-pinion-9t-for-pins-r40/mangle-pinion-9t-for-pins-r40.step) · [STL](https://xemstudio.com/files/hardware/mangle-pinion-9t-for-pins-r40/mangle-pinion-9t-for-pins-r40.stl) — pinion, axis Z, z 0..8, a space centred on -X

## Questions

**What shape are the teeth of a mangle pinion?**

8 mm pinion, pitch radius 12 mm (9 teeth to the wheel's 30 pin positions), Ø6 bore. Its tooth spaces are the envelope of the Ø4 pins as it rolls both outside the pin circle (centres 52 mm apart) and inside it (28 mm), so it clears the pins in either mesh.

## Fits with

- [Mangle wheel and pinion: continuous rotation to reciprocating rotation](https://xemstudio.com/objects/mangle-wheel-and-pinion-mechanism/)