Gauge cheek 12 × 40 × 16 with a 12 × 6 channel for the bar and Ø3 link pivot — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/gauge-cheek-12x40x16-ch12x6/  (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 12.0, width 40.0, height 16.0
- 12 × 40 × 16 block with a 12 × 6 mm channel across it (it sits on, or slides along, the cross-bar line-on-line), a Ø3 link-pivot hole at its centre through the top and a Ø3.2 cross hole for a thumb screw. Its 40 mm faces are the cheeks that bear on the sides of the work.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
cheek  12 × 40 × 16 mm
channel  12 × 6 mm (the bar)
pivot hole  Ø3 at the centre
screw hole  Ø3.2

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. 410: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_410.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/bisecting-gauge-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/gauge-cheek-12x40x16-ch12x6/index.json
API: https://xemstudio.com/api/geometry?object=gauge-cheek-12x40x16-ch12x6