Mangle (pin) wheel: Ø96 × 6 disc with 27 Ø4 × 12 pins on R40, gap of 3 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/mangle-pin-wheel-r40-27-pins/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 96.0, width 96.0, height 18.0
- Disc Ø96 × 6 (Ø8 bore) with Ø4 × 12 pins standing on a 40 mm radius at a 30-position pitch (8.38 mm), three positions left empty: the pinion runs round the outside of the pins one way and the inside the other, passing round the end pins at the gap.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
disc  Ø96 × 6, Ø8 bore
pins  27 × Ø4 × 12 on R40
pitch  8.38 mm (30 positions)
gap  3 positions, centred on −X

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
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/mangle-wheel-and-pinion-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/mangle-pin-wheel-r40-27-pins/index.json
API: https://xemstudio.com/api/geometry?object=mangle-pin-wheel-r40-27-pins