Mangle wheel and pinion: continuous rotation to reciprocating rotation — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/mangle-wheel-and-pinion-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 36 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- A pinion turning always the same way drives a wheel whose pins stand in a circle with a gap. Running outside the pins it turns the wheel one way; at the gap it slides round the end pin (its shaft moves in a radial slot) and runs inside the pins, turning the wheel back: continuous rotation becomes back-and-forth rotation.
- Here 27 pins on a 40 mm radius (30-position pitch, gap of 3) and a 9-tooth pinion of 12 mm pitch radius: centres 52 mm apart outside, 28 mm inside, so the wheel turns 0.3 × pinion speed — the same both ways because one pin circle serves both sides. Drawn running outside.
- Brown's No. 36 (mangle wheel and pinion, with the pinion shaft vibrating in a slot).
- Parts (each has its own page): mangle-pin-wheel-r40-27-pins, mangle-pinion-9t-for-pins-r40, mangle-slot-bar-r28-52, dowel-pins-metric, linear-shafts-h6.
- Brown's movement No. 36 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
pins  27 × Ø4 on R40
pinion  9 T, pitch R12
centres  52 (outside) / 28 (inside) mm
wheel swing  ≈ 300° each way

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 36: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_036.html

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/mangle-wheel-and-pinion-mechanism/index.json
API: https://xemstudio.com/api/geometry?object=mangle-wheel-and-pinion-mechanism