# Tackle beam 240 × 20 × 12 with Ø3 sockets every 5 mm

> What holds the fixed blocks and rope ends of a model tackle?

- 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/tackle-beam-240-sockets/ · JSON: https://xemstudio.com/api/geometry?object=tackle-beam-240-sockets · Plain text: https://xemstudio.com/objects/tackle-beam-240-sockets/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 |
|---|---|---|
| 240.0 | 20.0 | 12.0 |

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

## Notes

- 240 × 20 × 12 bar with a row of Ø3 × 8 deep sockets on one face every 5 mm (x = −115 … 115): block stems and rope ends plug into it at any 5 mm position. Overhead it is the beam; turned over it is the floor plate.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| bar | 240 × 20 × 12 mm |
| sockets | 47 × Ø3 × 8 deep, 5 mm pitch |

## 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. 12: figure, his text and an animation](https://507movements.com/mm_012.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/single-fixed-pulley-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/tackle-beam-240-sockets/index.json · license: https://xemstudio.com/files/hardware/tackle-beam-240-sockets/LICENSE.md

- tackle-beam-240-sockets: [STEP](https://xemstudio.com/files/hardware/tackle-beam-240-sockets/tackle-beam-240-sockets.step) · [STL](https://xemstudio.com/files/hardware/tackle-beam-240-sockets/tackle-beam-240-sockets.stl) — beam, sockets open on the z = 0 face

## Questions

**What holds the fixed blocks and rope ends of a model tackle?**

240 × 20 × 12 bar with a row of Ø3 × 8 deep sockets on one face every 5 mm (x = −115 … 115): block stems and rope ends plug into it at any 5 mm position. Overhead it is the beam; turned over it is the floor plate.

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