# Quarter-turn flat belt 12 × 1.5 for two Ø40 pulleys at right angles (loop drawn on the pulleys)

> How long is this quarter-turn belt?

- 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/flat-belt-12x1-5-quarter-turn-40-40/ · JSON: https://xemstudio.com/api/geometry?object=flat-belt-12x1-5-quarter-turn-40-40 · Plain text: https://xemstudio.com/objects/flat-belt-12x1-5-quarter-turn-40-40/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 |
|---|---|---|
| 47.67 | 103.0 | 47.67 |

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

## Notes

- 12 × 1.5 mm belt, inside length 271.4 mm, for two Ø40 pulleys on shafts at right angles, each pulley's mid-plane tangent to the other's belt circle; both pulleys get 216.87° of wrap.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| width × thickness | 12 × 1.5 mm |
| inside length | 271.4 mm |
| wrap | 216.87° on each pulley |

## 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. 4: figure, his text and an animation](https://507movements.com/mm_004.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/quarter-turn-belt-drive-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/flat-belt-12x1-5-quarter-turn-40-40/index.json · license: https://xemstudio.com/files/hardware/flat-belt-12x1-5-quarter-turn-40-40/LICENSE.md

- flat-belt-12x1-5-quarter-turn-40-40: [STEP](https://xemstudio.com/files/hardware/flat-belt-12x1-5-quarter-turn-40-40/flat-belt-12x1-5-quarter-turn-40-40.step) · [STL](https://xemstudio.com/files/hardware/flat-belt-12x1-5-quarter-turn-40-40/flat-belt-12x1-5-quarter-turn-40-40.stl) — belt loop

## Questions

**How long is this quarter-turn belt?**

12 × 1.5 mm belt, inside length 271.4 mm, for two Ø40 pulleys on shafts at right angles, each pulley's mid-plane tangent to the other's belt circle; both pulleys get 216.87° of wrap.

## Fits with

- [Quarter-turn belt between shafts at right angles (no guide pulleys)](https://xemstudio.com/objects/quarter-turn-belt-drive-mechanism/)