# Slotted bell crank: 100 mm arm with a 6.4 slot (50–90 mm) and a 50 mm arm at 90°, Ø5 bore

> What is a slotted bell crank?

- 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-bell-crank-100-50-slot-50-90-b5/ · JSON: https://xemstudio.com/api/geometry?object=slotted-bell-crank-100-50-slot-50-90-b5 · Plain text: https://xemstudio.com/objects/slotted-bell-crank-100-50-slot-50-90-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 |
|---|---|---|
| 64.0 | 115.0 | 8.0 |

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

## Notes

- 8 mm plate pivoted on a Ø5 pin: one arm 16 wide and 100 long with a 6.4 mm slot from 50 to 90 mm out for a crank pin's slide block, the other 12 wide with a Ø3 hole 50 mm out at 90°.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| slotted arm | 100 mm, 6.4 slot 50–90 |
| second arm | 50 mm at 90°, Ø3 hole |
| bore | Ø5 |
| 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. 156: figure, his text and an animation](https://507movements.com/mm_156.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/crank-slotted-bell-crank-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-bell-crank-100-50-slot-50-90-b5/index.json · license: https://xemstudio.com/files/hardware/slotted-bell-crank-100-50-slot-50-90-b5/LICENSE.md

- slotted-bell-crank-100-50: [STEP](https://xemstudio.com/files/hardware/slotted-bell-crank-100-50-slot-50-90-b5/slotted-bell-crank-100-50.step) · [STL](https://xemstudio.com/files/hardware/slotted-bell-crank-100-50-slot-50-90-b5/slotted-bell-crank-100-50.stl) — slotted arm on +Y, second arm on +X, z 0..8

## Questions

**What is a slotted bell crank?**

8 mm plate pivoted on a Ø5 pin: one arm 16 wide and 100 long with a 6.4 mm slot from 50 to 90 mm out for a crank pin's slide block, the other 12 wide with a Ø3 hole 50 mm out at 90°.

## Fits with

- [Crank pin in a slotted bell crank](https://xemstudio.com/objects/crank-slotted-bell-crank-mechanism/)