Four-lobe lifting cam R12 → R26, 8 thick, Ø8 bore — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tilt-hammer-cam-4-lobe-r12-r26-bore8/  (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 48.86, width 48.82, height 8.0
- Four lobes, each rising from R12 to R26 over 70° with cycloidal motion and then dropping straight back: it lifts the hammer helve four times per turn and lets it fall freely.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
lobes  4
rise  R12 → R26 over 70°, sudden drop
bore  Ø8
thickness  8 mm

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. 72: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_072.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/tilt-hammer-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/tilt-hammer-cam-4-lobe-r12-r26-bore8/index.json
API: https://xemstudio.com/api/geometry?object=tilt-hammer-cam-4-lobe-r12-r26-bore8