# Tilt hammer lifted four times per turn by a cam

> How does a tilt hammer work?

- Category: Mechanisms › Cams
- Kind: Hardware
- Basis: Xem Studio design following Brown No. 72 (1868)
- Page: https://xemstudio.com/objects/tilt-hammer-mechanism/ · JSON: https://xemstudio.com/api/geometry?object=tilt-hammer-mechanism · Plain text: https://xemstudio.com/objects/tilt-hammer-mechanism/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/)

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

## Notes

- A heavy hammer on a long helve, pivoted at its tail, rests on a cam shaft: each lobe lifts the helve and slips off its tip, so the hammer falls on the anvil under its own weight — four blows per turn with a four-lobe cam.
- Here the helve is pivoted 60 mm from the cam's axis and 20 mm above it; the lobes rise from R12 to R26 over 70° (cycloidal) and drop straight back. Drawn with the cam at 40° and the helve resting on a lobe (helve at 10.81°); the anvil sits 0.5 mm under the head's lowest position, when the helve rests on the cam's R12 base circle (-2.84°).
- Brown's No. 72 (cam lifting a tilt hammer four times a revolution); No. 353 is the version with the cam acting on the tail.
- Parts (each has its own page): tilt-hammer-cam-4-lobe-r12-r26-bore8, tilt-hammer-helve-200-head, tilt-hammer-anvil-50x30, dowel-pins-metric, linear-shafts-h6.
- Brown's movement No. 72 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

## Sizes

| parameter | value |
|---|---|
| cam | 4 lobes, R12 → R26 |
| helve | 200 mm, pivot at tail |
| blows per turn | 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. 72: figure, his text and an animation](https://507movements.com/mm_072.html) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/tilt-hammer-mechanism/index.json · license: https://xemstudio.com/files/hardware/tilt-hammer-mechanism/LICENSE.md

- tilt-hammer-mechanism-assembly: [STEP](https://xemstudio.com/files/hardware/tilt-hammer-mechanism/tilt-hammer-mechanism-assembly.step) · [STL](https://xemstudio.com/files/hardware/tilt-hammer-mechanism/tilt-hammer-mechanism-assembly.stl) — Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)

## Questions

**How does a tilt hammer work?**

A heavy hammer on a long helve, pivoted at its tail, rests on a cam shaft: each lobe lifts the helve and slips off its tip, so the hammer falls on the anvil under its own weight — four blows per turn with a four-lobe cam.

## Fits with

- [Four-lobe lifting cam R12 → R26, 8 thick, Ø8 bore](https://xemstudio.com/objects/tilt-hammer-cam-4-lobe-r12-r26-bore8/)
- [Tilt-hammer helve 200 mm with a 30 × 27 head, Ø6 pivot](https://xemstudio.com/objects/tilt-hammer-helve-200-head/)
- [Anvil block 50 × 30 × 12 for the tilt hammer](https://xemstudio.com/objects/tilt-hammer-anvil-50x30/)
- [Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)](https://xemstudio.com/objects/dowel-pins-metric/)
- [Linear shafts Ø3 to Ø25 mm (h6), 100 to 1000 mm long](https://xemstudio.com/objects/linear-shafts-h6/)