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Cams lifting a stamp that drops by its own weight

How are stamps lifted and dropped? · Hardware · basis: Xem Studio design following Brown No. 85 (1868)

Also called: stamp mill, cam stamp, drop stamp, gravity stamp, pisón accionado por levas, Pochwerk (Daumenstempel)

Exact dimensions. True size, with no printing tolerance added.

sizes
3 in table

Notes

  • 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.

Cams lifting a stamp that drops by its own weight size chart

parametervalue
cam2 lobes, 16 mm lift
blows per turn2
stamp8 × 8 stem, 160 long

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Henry T. Brown (1868, public domain)Five Hundred and Seven Mechanical Movements — scan on archive.orgwebPublisher's page; dimensions are facts
507movements.comBrown's movement No. 85: figure, his text and an animationwebPublisher's page; dimensions are facts

Free files

★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json

stamp-cam-mechanism-assemblyAssembled mechanism, all parts placed at one pose (STEP keeps each part separate)STEP · STL
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=stamp-cam-mechanism

Cams lifting a stamp that drops by its own weight, isometric render of a generated part
Render of stamp-cam-mechanism-assembly from the free STEP; not to scale.

Fits with

Two-lobe stamp cam R14 → R30, 8 thick, Ø8 bore, isometric render of a generated part
Two-lobe stamp cam R14 → R30, 8 thick, Ø8 bore45.96×55.17×8.0 mm★ 1 file
Stamp: 8 × 8 stem 160 long with a 48 × 10 tappet and a 16 × 30 head, isometric render of a generated part
Stamp: 8 × 8 stem 160 long with a 48 × 10 tappet and a 16 × 30 head52.0×190.0×8.0 mm★ 1 file
Guide block 16 × 16 × 16 with an 8 × 8 slot, isometric render of a generated part
Guide block 16 × 16 × 16 with an 8 × 8 slot16.0×16.0×16.0 mm★ 1 file
Linear shafts Ø3 to Ø25 mm (h6), 100 to 1000 mm long, isometric render of a generated part
Linear shafts Ø3 to Ø25 mm (h6), 100 to 1000 mm long10 sizes★ 70 files

Questions

How are stamps lifted and dropped?

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.