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Variable-crank disc Ø80 × 6 with a 6 mm radial slot (R8 → R34)

Name: Variable-crank disc Ø80 × 6 with a 6 mm radial slot (R8 → R34) dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

What carries the variable crank's pin? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance

Also called: variable crank, adjustable crank disc, disco de manivela variable, verstellbare Kurbelscheibe

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

length: 80.0 mm
width: 80.0 mm
height: 6.0 mm

Notes

Ø80 × 6 disc keyed to the shaft with a 6 mm radial slot from 8 to 34 mm out: the crank pin slides along it.
Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

Variable-crank disc Ø80 × 6 with a 6 mm radial slot size chart

dimension	value
disc	Ø80 × 6, Ø8 bore
slot	6 mm, R8 → R34

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.org	web	Publisher's page; dimensions are facts
507movements.com	Brown's movement No. 94: figure, his text and an animation	web	Publisher's page; dimensions are facts
Xem Studio	drawing	web	Publisher'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

variable-crank-disc-radial-slot-80

as drawn in the mechanism's own frame

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=variable-crank-disc-radial-slot-80

Variable-crank disc Ø80 × 6 with a 6 mm radial slot (R8 → R34), isometric render of a generated part — Render of variable-crank-disc-radial-slot-80 from the free STEP; not to scale.

Fits with

Free

Variable crank: a spiral-slotted plate moves the pin along a radial slot, isometric render of a generated part

Variable crank: a spiral-slotted plate moves the pin along a radial slot3 sizes★ 1 file

Questions

What carries the variable crank's pin?

Ø80 × 6 disc keyed to the shaft with a 6 mm radial slot from 8 to 34 mm out: the crank pin slides along it.