# Housing plate 70 × 40 × 6 with a Ø16 bush bore

> What holds the eccentric bush?

- 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/back-gear-housing-plate-70x40/ · JSON: https://xemstudio.com/api/geometry?object=back-gear-housing-plate-70x40 · Plain text: https://xemstudio.com/objects/back-gear-housing-plate-70x40/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 |
|---|---|---|
| 70.0 | 40.0 | 6.0 |

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

## Notes

- 70 × 40 × 6 plate with a Ø16 bore for the eccentric bush and four Ø3.4 (M3) holes; it is fixed 2.5 mm further from the spindle than the engaged pinion axle.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| plate | 70 × 40 × 6 |
| bore | Ø16 |
| holes | 4 × Ø3.4 |

## 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. 56: figure, his text and an animation](https://507movements.com/mm_056.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/eccentric-back-gear-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/back-gear-housing-plate-70x40/index.json · license: https://xemstudio.com/files/hardware/back-gear-housing-plate-70x40/LICENSE.md

- back-gear-housing-plate-70x40: [STEP](https://xemstudio.com/files/hardware/back-gear-housing-plate-70x40/back-gear-housing-plate-70x40.step) · [STL](https://xemstudio.com/files/hardware/back-gear-housing-plate-70x40/back-gear-housing-plate-70x40.stl) — plate, bore centre at origin, z -8..-2

## Questions

**What holds the eccentric bush?**

70 × 40 × 6 plate with a Ø16 bore for the eccentric bush and four Ø3.4 (M3) holes; it is fixed 2.5 mm further from the spindle than the engaged pinion axle.

## Fits with

- [Gear thrown in and out of mesh by an eccentric bush (lathe back gear)](https://xemstudio.com/objects/eccentric-back-gear-mechanism/)