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Swing-Nut Tubing Cutter: Swing the Blade Support Down and the Jaw Slides to the Tube, Up and the Screw Feeds It (Pritchard, 1941)
Frank L. Pritchard · Public domain
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13. noviembre 2026NO
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Swing-Nut Tubing Cutter: Swing the Blade Support Down and the Jaw Slides to the Tube, Up and the Screw Feeds It (Pritchard, 1941)

Frank L. Pritchard of Parker, Arizona, received US 2,231,593, dated 11 February 1941, for a tubing cutter small enough for a mechanic's tool box. The tube sits in a V in a fixed jaw. A movable jaw slides on the adjusting screw and a guide pin, with a spring pushing the jaws apart. The cutting wheel is held by a pivoted support with threads on its inner edge. Swung down, the support lets go of the screw, so the jaw can be pushed straight onto any tube. Swung up, it meshes with the screw again and the screw feeds the wheel in. We make his parts from steel bar and plate. All sizes are ours.
Intermedio
About 3 days

Instrucciones

1

The swing that lets go

Cargando el cuaderno de Jupyter…
2

Read US 2,231,593

"The pivoted blade support 16 may swing downwardly until the threads thereof will be free of the threads of the screw 8. The movable jaw 6 may now be slid downwardly until the pivoted blade support is in its proper cutting position."
3

Print the template

Both jaws, the blade support, the wheel and a 15 mm tube at 1:1, with the screw, pin and pivot holes. print at 100 % (check the 50 mm bar).
Archivo de DisenoPDFCC0 - Free
Descargar modelo
4

Make the stationary jaw

Saw 64 mm of 16 mm square bar, or of 16 mm plate. File the 90 degree V 8 mm deep in its top face. Drill the 6 mm pin hole and a 10 mm hole for the screw, and counterbore the pin hole 10 mm across, 5 mm deep, for the spring. Drill the 3 mm cross-pin hole across the jaw so it just cuts into the side of the screw hole.

Materiales para este paso:

Placa de acero dulcePlaca de acero dulce1 pieza

Herramientas necesarias:

Sierra para metalesSierra para metales
Juego de limasJuego de limas
Taladro de columnaTaladro de columna
Mordaza de máquinaMordaza de máquina
Juego de brocasJuego de brocas
GraneteGranete
Punta de trazarPunta de trazar
Tornillo de bancoTornillo de banco
Calibre digital de 6 pulgadasCalibre digital de 6 pulgadas
5

Make the movable jaw and the support

Saw the movable jaw 50 mm long from the same bar. Drill the 6.2 mm pin hole and its spring counterbore. Saw and file a slot 8.2 mm wide down its middle, from 22 mm to the end. Saw the blade support from 14 mm plate to the template. File its upper part down to 8 mm thick, centred, so it slides into the slot, and file away its lower inner corner. Saw a 7 mm slot up its lower part for the wheel. Drill the pivot and stop-pin holes through the jaw and support together, and file the stop-pin hole in the support into a short slot.

Materiales para este paso:

Placa de acero dulcePlaca de acero dulce1 pieza

Herramientas necesarias:

Sierra para metalesSierra para metales
Juego de limasJuego de limas
Juego de limas de agujaJuego de limas de aguja
Taladro de columnaTaladro de columna
Mordaza de máquinaMordaza de máquina
Juego de brocasJuego de brocas
Tornillo de bancoTornillo de banco
Calibre digital de 6 pulgadasCalibre digital de 6 pulgadas
6

Tap the half nut

Pin the support in the jaw, swung up, and clamp it there. Drill 6.8 mm down the screw axis through both, so the drill cuts a shallow groove in the support's inner edge, then tap it M8 through both. Take the support out and open the jaw's own hole to 8.5 mm, so the screw passes freely and only the support's threads hold it.

Herramientas necesarias:

Taladro de columnaTaladro de columna
Mordaza de máquinaMordaza de máquina
Juego de brocasJuego de brocas
Juego de machos y terrajasJuego de machos y terrajas
Aceite de corteAceite de corte
7

Make the screw and the guide pin

Turn the top 62 mm of a 90 mm piece of 10 mm bar to 8 mm and cut an M8 thread on it with the die. Turn a groove 1.5 mm deep and 3.2 mm wide in the plain part, where the cross pin will sit, and drill a 6 mm hole across its bottom end for a T-bar. Cut the guide pin, 80 mm of 6 mm rod, and drill a 3 mm hole across its top for the stop pin.

Materiales para este paso:

Barra redonda de acero dulceBarra redonda de acero dulce1 pieza
Redondo de acero dulceRedondo de acero dulce1 pieza

Herramientas necesarias:

Torno de metalTorno de metal
Plato de torno de 3 mordazasPlato de torno de 3 mordazas
Herramienta de corte para tornoHerramienta de corte para torno
Gubia de tronzarGubia de tronzar
Juego de machos y terrajasJuego de machos y terrajas
Taladro de columnaTaladro de columna
Juego de brocasJuego de brocas
Sierra para metalesSierra para metales
Calibre digital de 6 pulgadasCalibre digital de 6 pulgadas
8

Turn the cutting wheel

Chuck a tool steel bar and face it. Turn the end to 20 mm across for 10 mm, centre drill and drill a 5 mm hole 10 mm deep, and turn the edge to a 50 degree vee, 25 degrees each side, sharp in the middle of the 6 mm width. Part it off 6 mm long and take the burr off the hole.

Materiales para este paso:

Barra de acero de herramientasBarra de acero de herramientas1 pieza

Herramientas necesarias:

Torno de metalTorno de metal
Plato de torno de 3 mordazasPlato de torno de 3 mordazas
Herramienta de corte para tornoHerramienta de corte para torno
Gubia de tronzarGubia de tronzar
Juego de brocas de centrarJuego de brocas de centrar
Juego de brocasJuego de brocas
Calibre digital de 6 pulgadasCalibre digital de 6 pulgadas
Gafas de seguridadGafas de seguridad
9

Harden and temper

Heat the wheel to a cherry red, until a magnet no longer sticks, and quench it in water, moving it about. Rub it bright with a stone, warm it on a piece of steel plate over the fire, and quench again as soon as it turns a light straw colour.

Herramientas necesarias:

FraguaFragua
Tenazas de fraguaTenazas de fragua
Imán pequeñoImán pequeño
Cubo de templeCubo de temple
AguaAgua
Piedra de afilarPiedra de afilar
Guantes de soldadorGuantes de soldador
Gafas de seguridadGafas de seguridad
10

Assemble

Drive the guide pin into the stationary jaw. Put the screw into its hole from below and drive the cross pin in so it lies in the groove; the screw must still turn. Fit the T-bar. Slip the spring over the guide pin, then the movable jaw over the pin and the screw, and put the stop pin across the top. Fit the wheel in the support on its 5 mm pin, and pin the support into the jaw with its pivot and stop pins. Rivet a 1.5 mm steel strip along the top of the jaw, sticking out past the support as a thumb piece. Oil the threads.

Materiales para este paso:

Pasador de aceroPasador de acero5 piezas
Juego de muelles de compresiónJuego de muelles de compresión1 pieza
Fleje de acero para muellesFleje de acero para muelles1 pieza
Remaches de aceroRemaches de acero2 piezas
Redondo de acero dulceRedondo de acero dulce1 pieza

Herramientas necesarias:

Martillo de bolaMartillo de bola
GraneteGranete
Tornillo de bancoTornillo de banco
Taladro de columnaTaladro de columna
Juego de brocasJuego de brocas
Aceite de corteAceite de corte
11

Cut a copper tube

Mark a copper tube and hold it in a vice with soft jaws, or by hand for small tubes. Swing the support down, push the movable jaw down until the wheel touches the tube in the V, swing it up into the screw, and tighten the screw a little. Turn the cutter once round, give the screw about a quarter turn, and go on until the tube parts. The wheel should run in its own groove; the end should be square and not squeezed oval. Clean the inside of the end with a deburring tool.

Materiales para este paso:

Tubo de cobreTubo de cobre1 pieza

Herramientas necesarias:

Tornillo de bancoTornillo de banco
DesbarbadorDesbarbador
Calibre digital de 6 pulgadasCalibre digital de 6 pulgadas
12

Troubleshooting

Swing-nut tubing cutter troubleshooting.

Flow

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13

History and honest limits

**Frank L. Pritchard** of Parker, Arizona, US 2,231,593, dated 11 February 1941, filed 17 November 1939. He claimed "a pivoted blade support mounted on the movable jaw and having threads on the inner edge thereof adapted to engage the threads of said screw". His movable jaw had a bushing for the guide pin and a looped handle on the screw head; ours has a drilled hole and a T-bar. The patent gives no sizes or materials; all of ours are ours.

Materiales

9

Herramientas requeridas

27

Archivos de diseño

1

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