# Round band Ø5, endless, 321.33 mm centreline, on two pulleys 100 mm apart

> How long is the round band?

- 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/round-band-5-c100-pulleys-45v/ · JSON: https://xemstudio.com/api/geometry?object=round-band-5-c100-pulleys-45v · Plain text: https://xemstudio.com/objects/round-band-5-c100-pulleys-45v/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 |
|---|---|---|
| 143.62 | 43.62 | 5.0 |

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

## Notes

- Ø5 endless round band at its working shape on two equal pulleys 100 mm apart: centreline = 2 × 100 + 2π × 19.31 = 321.33 mm.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| section | Ø5 |
| centreline length | 321.33 mm |
| centre distance | 100 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. 258: figure, his text and an animation](https://507movements.com/mm_258.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/v-groove-pulleys-round-band-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/round-band-5-c100-pulleys-45v/index.json · license: https://xemstudio.com/files/hardware/round-band-5-c100-pulleys-45v/LICENSE.md

- round-band-5-c100-pulleys-45v: [STEP](https://xemstudio.com/files/hardware/round-band-5-c100-pulleys-45v/round-band-5-c100-pulleys-45v.step) · [STL](https://xemstudio.com/files/hardware/round-band-5-c100-pulleys-45v/round-band-5-c100-pulleys-45v.stl) — band in place, pulley axes at (0,0) and (100,0), mid-plane z 5

## Questions

**How long is the round band?**

Ø5 endless round band at its working shape on two equal pulleys 100 mm apart: centreline = 2 × 100 + 2π × 19.31 = 321.33 mm.

## Fits with

- [V-groove pulleys and round band, 1 : 1](https://xemstudio.com/objects/v-groove-pulleys-round-band-mechanism/)