# Rocking segment lever, R50 rim × 16, Ø8 pivot, 100 mm handle

> What is a rocking segment?

- 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/rocking-segment-lever-r50/ · JSON: https://xemstudio.com/api/geometry?object=rocking-segment-lever-r50 · Plain text: https://xemstudio.com/objects/rocking-segment-lever-r50/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 |
|---|---|---|
| 100.0 | 110.0 | 23.0 |

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

## Notes

- A lever whose end is a circular segment of 50 mm radius (198.83° of rim, 16 mm wide for a 16 mm band) on a Ø8 pivot, with a 10 × 5 handle 100 mm long on a Ø20 boss, above the band's plane: a band fixed to the two ends of the rim and run round pulleys below turns them as the lever rocks.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| rim radius | 50 mm |
| rim arc | 198.83° |
| rim width | 16 mm |
| pivot | Ø8, Ø20 boss |
| handle | 10 × 5 × 100 mm, z 20..25 |

## 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. 6: figure, his text and an animation](https://507movements.com/mm_006.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/segment-lever-band-pulleys-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/rocking-segment-lever-r50/index.json · license: https://xemstudio.com/files/hardware/rocking-segment-lever-r50/LICENSE.md

- rocking-segment-lever-r50: [STEP](https://xemstudio.com/files/hardware/rocking-segment-lever-r50/rocking-segment-lever-r50.step) · [STL](https://xemstudio.com/files/hardware/rocking-segment-lever-r50/rocking-segment-lever-r50.stl) — segment, pivot on the Z axis, rim on +Y, z 2..18

## Questions

**What is a rocking segment?**

A lever whose end is a circular segment of 50 mm radius (198.83° of rim, 16 mm wide for a 16 mm band) on a Ø8 pivot, with a 10 × 5 handle 100 mm long on a Ø20 boss, above the band's plane: a band fixed to the two ends of the rim and run round pulleys below turns them as the lever rocks.

## Fits with

- [Rocking segment and band turning two pulleys to and fro](https://xemstudio.com/objects/segment-lever-band-pulleys-mechanism/)