Tilt hammer lifted four times per turn by a cam — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tilt-hammer-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 72 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- A heavy hammer on a long helve, pivoted at its tail, rests on a cam shaft: each lobe lifts the helve and slips off its tip, so the hammer falls on the anvil under its own weight — four blows per turn with a four-lobe cam.
- Here the helve is pivoted 60 mm from the cam's axis and 20 mm above it; the lobes rise from R12 to R26 over 70° (cycloidal) and drop straight back. Drawn with the cam at 40° and the helve resting on a lobe (helve at 10.81°); the anvil sits 0.5 mm under the head's lowest position, when the helve rests on the cam's R12 base circle (-2.84°).
- Brown's No. 72 (cam lifting a tilt hammer four times a revolution); No. 353 is the version with the cam acting on the tail.
- Parts (each has its own page): tilt-hammer-cam-4-lobe-r12-r26-bore8, tilt-hammer-helve-200-head, tilt-hammer-anvil-50x30, dowel-pins-metric, linear-shafts-h6.
- Brown's movement No. 72 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
cam  4 lobes, R12 → R26
helve  200 mm, pivot at tail
blows per turn  4

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

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