# Slotted arm with a 60° toothed sector (module 1, 60 T), Ø5 bore

> What is a slotted sector 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/slotted-arm-sector-gear-m1-60t-60deg-b5/ · JSON: https://xemstudio.com/api/geometry?object=slotted-arm-sector-gear-m1-60t-60deg-b5 · Plain text: https://xemstudio.com/objects/slotted-arm-sector-gear-m1-60t-60deg-b5/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 |
|---|---|---|
| 28.85 | 138.98 | 8.0 |

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

## Notes

- 8 mm plate: a 60° sector of a module 1, 60-tooth gear (pitch R30) on one side of a Ø14 hub (Ø5 bore) and a 16 mm wide arm 100 mm long on the other with a 6.4 mm slot from 40 to 100 mm out for a crank-pin slide block. Teeth are placed so a tooth space is centred on the arm's axis (−Y).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| sector | 60° of 60 T, module 1 (pitch R30) |
| arm | 100 mm, 6.4 slot 40–100 |
| hub | Ø14, Ø5 bore |
| 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. 131: figure, his text and an animation](https://507movements.com/mm_131.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/crank-slotted-arm-sector-rack-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/slotted-arm-sector-gear-m1-60t-60deg-b5/index.json · license: https://xemstudio.com/files/hardware/slotted-arm-sector-gear-m1-60t-60deg-b5/LICENSE.md

- slotted-arm-sector-gear-m1-60t: [STEP](https://xemstudio.com/files/hardware/slotted-arm-sector-gear-m1-60t-60deg-b5/slotted-arm-sector-gear-m1-60t.step) · [STL](https://xemstudio.com/files/hardware/slotted-arm-sector-gear-m1-60t-60deg-b5/slotted-arm-sector-gear-m1-60t.stl) — arm on +Y, teeth centred on −Y, z 0..8

## Questions

**What is a slotted sector arm?**

8 mm plate: a 60° sector of a module 1, 60-tooth gear (pitch R30) on one side of a Ø14 hub (Ø5 bore) and a 16 mm wide arm 100 mm long on the other with a 6.4 mm slot from 40 to 100 mm out for a crank-pin slide block. Teeth are placed so a tooth space is centred on the arm's axis (−Y).

## Fits with

- [Crank, slotted arm and toothed sector driving a rack](https://xemstudio.com/objects/crank-slotted-arm-sector-rack-mechanism/)