# Trip-hammer helve 200 × 12 × 8, Ø5 pivot 80 mm from the tail

> What is a hammer helve?

- 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/trip-hammer-helve-200x12/ · JSON: https://xemstudio.com/api/geometry?object=trip-hammer-helve-200x12 · Plain text: https://xemstudio.com/objects/trip-hammer-helve-200x12/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 |
|---|---|---|
| 200.0 | 12.0 | 8.0 |

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

## Notes

- 200 × 12 × 8 bar pivoted on a Ø5 pin 80 mm from its tail end (first-order lever: the wiper presses the tail down, the 120 mm head end rises; when the wiper slips off, the head falls).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| bar | 200 × 12 × 8 mm |
| pivot | Ø5, 80 mm from the tail |
| arms | 80 (tail) / 120 (head) |

## 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/trip-hammer-helve-200x12/index.json · license: https://xemstudio.com/files/hardware/trip-hammer-helve-200x12/LICENSE.md

- trip-hammer-helve-200x12: [STEP](https://xemstudio.com/files/hardware/trip-hammer-helve-200x12/trip-hammer-helve-200x12.step) · [STL](https://xemstudio.com/files/hardware/trip-hammer-helve-200x12/trip-hammer-helve-200x12.stl) — helve, z 0..8, pivot hole along Y at x 0, z 4, tail on −X

## Questions

**What is a hammer helve?**

200 × 12 × 8 bar pivoted on a Ø5 pin 80 mm from its tail end (first-order lever: the wiper presses the tail down, the 120 mm head end rises; when the wiper slips off, the head falls).

## Fits with

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