# Oblique (swash) disc reciprocating a rod parallel to the shaft

> How does a swash plate make a rod reciprocate?

- Category: Mechanisms › Cams
- Kind: Hardware
- Basis: Xem Studio design following Brown No. 95 (1868)
- Page: https://xemstudio.com/objects/swash-plate-rod-mechanism/ · JSON: https://xemstudio.com/api/geometry?object=swash-plate-rod-mechanism · Plain text: https://xemstudio.com/objects/swash-plate-rod-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 disc fixed obliquely on a shaft: a rod parallel to the shaft, pressed against the disc's face, moves up and down once per turn — stroke 2 r tan θ at radius r (here 2 × 14 × tan 15° = 7.5 mm).
- Catalog Ø40 × 15° swash plate and ball-ended follower; follower at 14 mm radius in a square guide, its Ø8 ball touching the face (centre 4.53 mm above the plate's hub centre).
- Brown's No. 95 (oblique disc on an upright shaft giving reciprocating motion to a rod resting on it).
- Parts (each has its own page): swash-plate, swash-follower-guide-sq8, linear-shafts-h6.
- Brown's movement No. 95 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

## Sizes

| parameter | value |
|---|---|
| plate | Ø40, 15° |
| follower radius | 14 mm |
| stroke | 7.5 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. 95: figure, his text and an animation](https://507movements.com/mm_095.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/swash-plate-rod-mechanism/index.json · license: https://xemstudio.com/files/hardware/swash-plate-rod-mechanism/LICENSE.md

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

## Questions

**How does a swash plate make a rod reciprocate?**

A disc fixed obliquely on a shaft: a rod parallel to the shaft, pressed against the disc's face, moves up and down once per turn — stroke 2 r tan θ at radius r (here 2 × 14 × tan 15° = 7.5 mm).

## Fits with

- [Swash (wobble) plates Ø40 at 10, 15 and 20°](https://xemstudio.com/objects/swash-plate-40mm/)
- [Follower guide 20 × 20 × 10 with an 8 × 8 square hole](https://xemstudio.com/objects/swash-follower-guide-sq8/)
- [Linear shafts Ø3 to Ø25 mm (h6), 100 to 1000 mm long](https://xemstudio.com/objects/linear-shafts-h6/)