# Two-lobe stamp cam R14 → R30, 8 thick, Ø8 bore

> What lifts a stamp?

- 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/stamp-cam-2-lobe-r14-r30-bore8/ · JSON: https://xemstudio.com/api/geometry?object=stamp-cam-2-lobe-r14-r30-bore8 · Plain text: https://xemstudio.com/objects/stamp-cam-2-lobe-r14-r30-bore8/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 |
|---|---|---|
| 45.96 | 55.17 | 8.0 |

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

## Notes

- Two lobes, each rising from R14 to R30 over 140° (cycloidal) and dropping straight back: the stamp's tappet rides up the lobe and falls off its tip twice per turn.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| lobes | 2 |
| lift | 16 mm |
| bore | Ø8 |

## 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. 85: figure, his text and an animation](https://507movements.com/mm_085.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/stamp-cam-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/stamp-cam-2-lobe-r14-r30-bore8/index.json · license: https://xemstudio.com/files/hardware/stamp-cam-2-lobe-r14-r30-bore8/LICENSE.md

- stamp-cam-2-lobe-r14-r30-bore8: [STEP](https://xemstudio.com/files/hardware/stamp-cam-2-lobe-r14-r30-bore8/stamp-cam-2-lobe-r14-r30-bore8.step) · [STL](https://xemstudio.com/files/hardware/stamp-cam-2-lobe-r14-r30-bore8/stamp-cam-2-lobe-r14-r30-bore8.stl) — as drawn in the mechanism's own frame

## Questions

**What lifts a stamp?**

Two lobes, each rising from R14 to R30 over 140° (cycloidal) and dropping straight back: the stamp's tappet rides up the lobe and falls off its tip twice per turn.

## Fits with

- [Cams lifting a stamp that drops by its own weight](https://xemstudio.com/objects/stamp-cam-mechanism/)