# Hand crank, pinion and toothed sector pressing through a connecting rod

> How does a sector gear give a press its force?

- Category: Mechanisms › Gears
- Kind: Hardware
- Basis: Xem Studio design following Brown No. 133 (1868)
- Page: https://xemstudio.com/objects/sector-gear-press-mechanism/ · JSON: https://xemstudio.com/api/geometry?object=sector-gear-press-mechanism · Plain text: https://xemstudio.com/objects/sector-gear-press-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 hand lever turns a 20-tooth pinion meshing with a 60-tooth sector (3 : 1); an arm on the sector drives the platen down through a connecting rod and a guided block. Force at the platen ≈ 3 × (lever / arm) × hand force = 3 × 60/60 × F, rising as the rod comes into line with the guide.
- Drawn with the sector turned 12°: the arm end at (12.47, -58.69), the platen block at y = -117.38 in a 6.2 mm slot (contact), the 60 mm catalog link as the rod.
- Brown's No. 133 (press: crank, pinion, toothed sector and connecting rod to the platen).
- Parts (each has its own page): sector-gear-m1-60t-90deg-arm-60-b5, spur-gears-module-1, hand-lever-60-bore6, four-bar-links, slide-block-12x6, slot-guide-plate-90, dowel-pins-metric.
- Brown's movement No. 133 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

## Sizes

| parameter | value |
|---|---|
| pinion / sector | 20 T / 60 T, module 1 |
| centre distance | 40 mm |
| sector arm | 60 mm |
| rod | 60 mm |
| lever | 60 mm |

## 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. 133: figure, his text and an animation](https://507movements.com/mm_133.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/sector-gear-press-mechanism/index.json · license: https://xemstudio.com/files/hardware/sector-gear-press-mechanism/LICENSE.md

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

## Questions

**How does a sector gear give a press its force?**

A hand lever turns a 20-tooth pinion meshing with a 60-tooth sector (3 : 1); an arm on the sector drives the platen down through a connecting rod and a guided block. Force at the platen ≈ 3 × (lever / arm) × hand force = 3 × 60/60 × F, rising as the rod comes into line with the guide.

## Fits with

- [90° toothed sector (module 1, 60 T) with a 60 mm arm and Ø3 pin hole, Ø5 bore](https://xemstudio.com/objects/sector-gear-m1-60t-90deg-arm-60-b5/)
- [Spur gears, module 1: 10 to 80 teeth (20° involute)](https://xemstudio.com/objects/spur-gears-module-1/)
- [Hand lever, 60 mm, Ø6 hub bore](https://xemstudio.com/objects/hand-lever-60-bore6/)
- [Four-bar links: flat links with 20 to 100 mm hole centres](https://xemstudio.com/objects/four-bar-links/)
- [Slide block 12 × 6.2 mm for a 6.4 mm slot](https://xemstudio.com/objects/slide-block-12x6/)
- [Slot guide plate 90 × 30 × 5, 6.2 mm slot (74 long)](https://xemstudio.com/objects/slot-guide-plate-90/)
- [Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)](https://xemstudio.com/objects/dowel-pins-metric/)