# Governor arm 80 mm with a Ø24 ball, Ø3 pivot and link holes

> What is a governor arm?

- 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/governor-arm-80-ball-24/ · JSON: https://xemstudio.com/api/geometry?object=governor-arm-80-ball-24 · Plain text: https://xemstudio.com/objects/governor-arm-80-ball-24/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 |
|---|---|---|
| 98.0 | 24.0 | 24.0 |

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

## Notes

- 10 × 5 flat arm 45 mm long with a Ø3 pivot hole at the top and a Ø3 hole 40 mm down for the link to the sleeve, continued by a Ø4 rod that carries a Ø24 ball 80 mm from the pivot (the rod's end stands 1 mm out of the ball).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| flat arm | 10 × 5, holes at 0 and 40 mm |
| rod | Ø4 |
| ball | Ø24, centre 80 mm from the pivot |

## 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. 161: figure, his text and an animation](https://507movements.com/mm_161.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/flyball-governor-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/governor-arm-80-ball-24/index.json · license: https://xemstudio.com/files/hardware/governor-arm-80-ball-24/LICENSE.md

- governor-arm-80-ball-24: [STEP](https://xemstudio.com/files/hardware/governor-arm-80-ball-24/governor-arm-80-ball-24.step) · [STL](https://xemstudio.com/files/hardware/governor-arm-80-ball-24/governor-arm-80-ball-24.stl) — arm, pivot at the origin, along +X, z 0..5, ball centre at (80, 0, 2.5)

## Questions

**What is a governor arm?**

10 × 5 flat arm 45 mm long with a Ø3 pivot hole at the top and a Ø3 hole 40 mm down for the link to the sleeve, continued by a Ø4 rod that carries a Ø24 ball 80 mm from the pivot (the rod's end stands 1 mm out of the ball).

## Fits with

- [Centrifugal (fly-ball) governor](https://xemstudio.com/objects/flyball-governor-mechanism/)