Cams lifting a stamp that drops by its own weight — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/stamp-cam-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 85 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- A cam on a turning shaft catches the tappet on a vertical stamp, lifts it, and lets it slip off the lobe's tip so the stamp falls by its own weight onto the work — the ore stamp and the drop hammer.
- Two lobes rising R14 → R30 over 140°: 16 mm lift, two blows per turn. The stamp's stem runs in two guide blocks 40 mm to the side of the cam shaft; drawn with the cam at 60° and the tappet resting on it.
- Brown's No. 85 (cams on a rotating shaft lifting rods that drop by gravity: stamps and hammers).
- Parts (each has its own page): stamp-cam-2-lobe-r14-r30-bore8, stamp-stem-8x8-160-tappet-head, stamp-guide-block-16x16-sq8, linear-shafts-h6.
- Brown's movement No. 85 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
cam  2 lobes, 16 mm lift
blows per turn  2
stamp  8 × 8 stem, 160 long

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. 85: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_085.html

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