# Two-lobed wiper cam, base R12, tip R24, 10 thick, Ø8 bore

> What is a wiper cam?

- 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/wiper-cam-2-lobe-r12-r24-b8/ · JSON: https://xemstudio.com/api/geometry?object=wiper-cam-2-lobe-r12-r24-b8 · Plain text: https://xemstudio.com/objects/wiper-cam-2-lobe-r12-r24-b8/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 |
|---|---|---|
| 48.0 | 24.0 | 10.0 |

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

## Notes

- 10 mm plate cam with two lobes: a R12 base circle, a straight rising flank and a R24 tip arc of 10° on each lobe, falling straight back to the base — the classic hammer wiper that lifts a lever and lets it drop twice per turn. Ø8 bore.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| base circle | R12 |
| lobe tip | R24, 10° arc |
| lobes | 2 |
| thickness | 10 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. 353: figure, his text and an animation](https://507movements.com/mm_353.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/trip-hammer-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/wiper-cam-2-lobe-r12-r24-b8/index.json · license: https://xemstudio.com/files/hardware/wiper-cam-2-lobe-r12-r24-b8/LICENSE.md

- wiper-cam-2-lobe-r12-r24-b8: [STEP](https://xemstudio.com/files/hardware/wiper-cam-2-lobe-r12-r24-b8/wiper-cam-2-lobe-r12-r24-b8.step) · [STL](https://xemstudio.com/files/hardware/wiper-cam-2-lobe-r12-r24-b8/wiper-cam-2-lobe-r12-r24-b8.stl) — cam, z 0..10, a tip at 175°

## Questions

**What is a wiper cam?**

10 mm plate cam with two lobes: a R12 base circle, a straight rising flank and a R24 tip arc of 10° on each lobe, falling straight back to the base — the classic hammer wiper that lifts a lever and lets it drop twice per turn. Ø8 bore.

## Fits with

- [Trip hammer: wiper cam pressing the tail of a first-order helve](https://xemstudio.com/objects/trip-hammer-mechanism/)