# Proportional compass leg 160 × 14 × 5, pointed, 6.2 mm slot 100 long

> What is a proportional compass leg?

- 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/proportional-compass-leg-160-slot6/ · JSON: https://xemstudio.com/api/geometry?object=proportional-compass-leg-160-slot6 · Plain text: https://xemstudio.com/objects/proportional-compass-leg-160-slot6/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 |
|---|---|---|
| 160.0 | 14.0 | 5.0 |

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

## Notes

- 160 × 14 × 5 leg pointed at both ends with a 6.2 × 106 mm slot along its middle: the pivot slide block runs in it, so the ratio of the two point spacings can be set anywhere from 1 : 1 (pivot central) to about 5 : 1.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| leg | 160 × 14 × 5 mm |
| slot | 6.2 mm, centres ±50 |
| points | both ends |

## 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. 409: figure, his text and an animation](https://507movements.com/mm_409.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/proportional-compasses-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/proportional-compass-leg-160-slot6/index.json · license: https://xemstudio.com/files/hardware/proportional-compass-leg-160-slot6/LICENSE.md

- proportional-compass-leg-160-slot6: [STEP](https://xemstudio.com/files/hardware/proportional-compass-leg-160-slot6/proportional-compass-leg-160-slot6.step) · [STL](https://xemstudio.com/files/hardware/proportional-compass-leg-160-slot6/proportional-compass-leg-160-slot6.stl) — leg, z 0..5, slot along X

## Questions

**What is a proportional compass leg?**

160 × 14 × 5 leg pointed at both ends with a 6.2 × 106 mm slot along its middle: the pivot slide block runs in it, so the ratio of the two point spacings can be set anywhere from 1 : 1 (pivot central) to about 5 : 1.

## Fits with

- [Proportional compasses (sliding pivot in slotted legs)](https://xemstudio.com/objects/proportional-compasses-mechanism/)