Mutilated mitre gear, module 2, 20 teeth with 10 kept (half), Ø5 bore — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/mitre-gear-m2-20t-bore5-half-teeth/  (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 39.55, width 42.78, height 23.94
- The module 2, 20-tooth spherical-involute mitre gear with the teeth over half its circumference cut down to the root cone: it drives a mating gear for half a turn and leaves it for the other half.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
module  2
teeth  10 of 20 (180°)
bore  Ø5

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. 74: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_074.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/mutilated-bevel-gear-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/mitre-gear-m2-20t-bore5-half-teeth/index.json
API: https://xemstudio.com/api/geometry?object=mitre-gear-m2-20t-bore5-half-teeth