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Rotary-Wheel Can Opener
Forge

Creado por

Forge

22. septiembre 2026NO
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Rotary-Wheel Can Opener

The 1858 lever opener already published is a blade you drive into the lid and saw along by hand: it leaves a torn edge, needs real force, and slips. Charles Arthur Bunker's rung is the one still in every kitchen drawer - a toothed feed wheel that grips the can's rim and walks the can past a hardened cutting wheel, so the cut is rolled, not torn. **US 1,838,525**, "Can opener", Bunker, assigned to Bunker-Clancey Manufacturing, filed 20. May 1926, granted 29. December 1931. **You build the head** - feed wheel, cutting wheel and crank on a plywood body - and measure the force it takes against the lever opener.
Intermedio
4 hours

Instrucciones

1

Win the cutting wheel

Take the hardened wheel and its axle from a cheap tubing cutter. Keep the wheel's edge unharmed - it is the one part you cannot file yourself.

Materiales para este paso:

CortatubosCortatubos1 pieza

Herramientas necesarias:

Tornillo de bancoTornillo de banco
Gafas de seguridad transparentesGafas de seguridad transparentes
2

Make the feed wheel

Cut a 12 mm disc from steel bar or use a hex bolt head. File 16 shallow teeth around its edge with the triangular file - deep enough to bite a rim, not to cut it.

Materiales para este paso:

Surtido de tornillos hexagonalesSurtido de tornillos hexagonales1 juego
Juego de tuercas y arandelasJuego de tuercas y arandelas1 juego

Herramientas necesarias:

Lima para metalLima para metal
Sierra para metalesSierra para metales
Tornillo de bancoTornillo de banco
3

Body and crank

From 18 mm plywood cut two side plates. Mount the feed wheel on a shaft through both, with a 45 mm crank arm. Mount the cutting wheel above it on a pivoting jaw so that squeezing the handles presses wheel to rim, exactly 1.5 mm inboard of the seam.

Materiales para este paso:

Tablero contrachapadoTablero contrachapado1 pieza

Herramientas necesarias:

SerruchoSerrucho
Taladro inalámbricoTaladro inalámbrico
Regla de aceroRegla de acero
4

Open a can

Clamp an empty rinsed can's rim between the wheels, squeeze, and crank. Adjust the cutting wheel's height until it rolls a clean cut without jamming. Watch the fingers on the cut lid.

Materiales para este paso:

LataLata2 piezas

Herramientas necesarias:

Gafas de seguridad transparentesGafas de seguridad transparentes
5

Measure both openers

Hook the spring scale to your crank and to the lever opener's handle in turn, and record the force needed while cutting - six readings each.

Materiales para este paso:

LataLata2 piezas

Herramientas necesarias:

Dinamómetro (balanza de resorte)Dinamómetro (balanza de resorte)
Tijeras de chapaTijeras de chapa
6

Forces and wheel sizes

Cargando el cuaderno de Jupyter…
7

History & Context

**What the patent specifies:** a feed wheel with teeth engaging the can's rim and a cutting wheel bearing on the lid, so turning a crank carries the can past the cutter. **Modern build (derived):** a tubing-cutter wheel and a filed feed wheel on a plywood body. Later openers moved the cut to the side seam so the lid lifts out without a sharp edge, and motors replaced the crank. Its limits: the wheels must be set to the rim thickness, a bent rim stops the feed, and the cut edge of a top-cut lid is sharp.
Paso 7 - Image 1

Materiales

5

Herramientas requeridas

9

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