# Mutilated mitre gear, module 2, 20 teeth with 10 kept (half), Ø5 bore

> What is a mutilated bevel gear?

- 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/mitre-gear-m2-20t-bore5-half-teeth/ · JSON: https://xemstudio.com/api/geometry?object=mitre-gear-m2-20t-bore5-half-teeth · Plain text: https://xemstudio.com/objects/mitre-gear-m2-20t-bore5-half-teeth/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 |
|---|---|---|
| 39.55 | 42.78 | 23.94 |

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

## Notes

- The module 2, 20-tooth spherical-involute mitre gear with the teeth over half its circumference cut down to the root cone: it drives a mating gear for half a turn and leaves it for the other half.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| module | 2 |
| teeth | 10 of 20 (180°) |
| bore | Ø5 |

## 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. 74: figure, his text and an animation](https://507movements.com/mm_074.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/mutilated-bevel-gear-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/mitre-gear-m2-20t-bore5-half-teeth/index.json · license: https://xemstudio.com/files/hardware/mitre-gear-m2-20t-bore5-half-teeth/LICENSE.md

- mitre-gear-m2-20t-bore5-half-teeth: [STEP](https://xemstudio.com/files/hardware/mitre-gear-m2-20t-bore5-half-teeth/mitre-gear-m2-20t-bore5-half-teeth.step) · [STL](https://xemstudio.com/files/hardware/mitre-gear-m2-20t-bore5-half-teeth/mitre-gear-m2-20t-bore5-half-teeth.stl) — gear, apex at origin, axis +Z, teeth kept on the +X half

## Questions

**What is a mutilated bevel gear?**

The module 2, 20-tooth spherical-involute mitre gear with the teeth over half its circumference cut down to the root cone: it drives a mating gear for half a turn and leaves it for the other half.

## Fits with

- [Mutilated bevel gear driving two bevel gears alternately, opposite ways](https://xemstudio.com/objects/mutilated-bevel-gear-mechanism/)