# Pawl for the 24-tooth Ø40 ratchet, pivot to nose 30.89 mm

> What pawls does the double-pawl lever carry?

- 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/lever-pawl-24t-d40-upper/ · JSON: https://xemstudio.com/api/geometry?object=lever-pawl-24t-d40-upper · Plain text: https://xemstudio.com/objects/lever-pawl-24t-d40-upper/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 |
|---|---|---|
| 34.89 | 8.0 | 6.0 |

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

## Notes

- 6 mm pawl with a Ø8 boss on a Ø3 pivot and a nose whose end face lies on the steep face of a ratchet tooth over 80 % of its depth (face contact). Pivot to nose 30.89 mm; one of the two pawls of the double-pawl lever (pivots at (12, 20) and (12, -17) from the fulcrum).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| thickness | 6 mm |
| pivot | Ø3 |
| pivot to nose | 30.89 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. 206: figure, his text and an animation](https://507movements.com/mm_206.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/double-pawl-lever-ratchet-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/lever-pawl-24t-d40-upper/index.json · license: https://xemstudio.com/files/hardware/lever-pawl-24t-d40-upper/LICENSE.md

- lever-pawl-24t-d40-upper: [STEP](https://xemstudio.com/files/hardware/lever-pawl-24t-d40-upper/lever-pawl-24t-d40-upper.step) · [STL](https://xemstudio.com/files/hardware/lever-pawl-24t-d40-upper/lever-pawl-24t-d40-upper.stl) — pawl, pivot at origin, nose on +X, z 0..6

## Questions

**What pawls does the double-pawl lever carry?**

6 mm pawl with a Ø8 boss on a Ø3 pivot and a nose whose end face lies on the steep face of a ratchet tooth over 80 % of its depth (face contact). Pivot to nose 30.89 mm; one of the two pawls of the double-pawl lever (pivots at (12, 20) and (12, -17) from the fulcrum).

## Fits with

- [Lever with two pawls driving a ratchet on both strokes](https://xemstudio.com/objects/double-pawl-lever-ratchet-mechanism/)