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Cam-Arm Tubing Cutter: Two Swinging Arms Keep the Wheel and Rollers Evenly Round Any Tube (Lutsker, 1959)
Simon Lutsker · Public domain
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13. noviembre 2026NO
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Cam-Arm Tubing Cutter: Two Swinging Arms Keep the Wheel and Rollers Evenly Round Any Tube (Lutsker, 1959)

Simon Lutsker of Shaker Heights, Ohio, received US 2,870,536, dated 27 January 1959, for a tubing cutter that grips small and large tubes equally well. The wheel turns under a housing at the foot of a guide. A block slides up the guide on a screw. Two arms hang from the block, each with a roller at its lower end. Springs press the arms' curved cam edges against rollers on the housing. As the screw draws the block up, the arms swing inwards or outwards, so the wheel and the two rollers stay about evenly spaced round the tube, whatever its size. We worked out the cam so the three contacts are exactly 120 degrees apart. The curve comes out as an arc, as in his patent. All sizes are ours.
Avanzado
About 4 days

Instrucciones

1

Three points evenly round

Cargando el cuaderno de Jupyter…
2

Read US 2,870,536

"Irrespective of the size of the tubing which is being cut, the points of engagement of the cutter wheel 21 and support rollers 32 with the tubing will always be substantially equidistant from each other circumferentially of the tubing."
3

Print the template

The arm plate with its cam edge, the housing and the guide block at 1:1, with holes, slots and sizes. print at 100 % (check the 50 mm bar).
Archivo de DisenoPDFCC0 - Free
Descargar modelo
4

Cut the arm plates

Glue four copies of the arm outline on 3 mm steel plate. Saw and file them to the line, taking the cam edge slowly and checking it against the template. Clamp them in a stack and drill the 4 mm pivot and roller-pin holes and the two 3 mm holes through all four together.

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
GraneteGranete
Tornillo de bancoTornillo de banco
Calibre digital de 6 pulgadasCalibre digital de 6 pulgadas
5

Make the housing

From 30 x 20 flat bar, saw a block 64 mm long and file it to 28 x 18 mm, leaving the two ears below its middle. Saw the forked ends: two cuts 14.4 mm apart, 20 mm in from each end, and break out the middle. Saw and file a 7 mm slot up between the ears for the wheel. Drill the 5 mm shaft hole across the ears, the 4 mm housing-roller pins across the forks, and the 4 mm rivet hole. File a groove 20 mm wide and 3 mm deep down each face for the guide's legs.

Materiales para este paso:

Pletina de acero dulcePletina 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
Tornillo de bancoTornillo de banco
Calibre digital de 6 pulgadasCalibre digital de 6 pulgadas
Punta de trazarPunta de trazar
6

Make the block and the guide

Saw the guide block from the same bar, 60 x 18 x 28 mm, with forked ends from 14 mm out, the 4 mm pivot holes, the 3 mm spring-pin holes and the leg grooves. Drill 8.5 mm up its middle and tap M10. Bend a 20 x 3 mm flat bar into an inverted U with its legs 22 mm apart inside and 69 mm high, and drill a 10.5 mm hole in its top.

Materiales para este paso:

Pletina de acero dulcePletina de acero dulce2 piezas

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
Juego de machos y terrajasJuego de machos y terrajas
Tornillo de bancoTornillo de banco
Martillo de bolaMartillo de bola
Calibre digital de 6 pulgadasCalibre digital de 6 pulgadas
7

Turn the rollers and the wheel shaft

Turn two housing rollers 10 mm across and 14 mm long, and two lower rollers 12 mm across and 7.6 mm long, from mild steel bar, all bored 4.2 mm. For the wheel shaft, turn a 6 mm rod to 5 mm, leaving a 6 mm head, file a flat on the head, and turn a groove near the other end.

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 brocasJuego de brocas
Juego de limasJuego de limas
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

Make the springs

From spring steel strip, cut two strips 8 mm wide and 30 mm long for the arm springs, and one 6 mm wide and 25 mm long to hold the wheel shaft. Bend each arm spring so it presses on its arm's spring pin and pushes the arm outwards. Drill a hole in the end of each for its pin or screw.

Materiales para este paso:

Fleje de acero para muellesFleje de acero para muelles1 pieza

Herramientas necesarias:

Sierra para metalesSierra para metales
Juego de limasJuego de limas
Taladro de columnaTaladro de columna
Juego de brocasJuego de brocas
Tornillo de bancoTornillo de banco
11

Make the screw

Cut 90 mm of M10 threaded rod. Lock two nuts together 25 mm from its top as the flange. Put it up through the guide's top hole, add two washers as the spacer, then a nut locked with a second one. Drill a 6 mm hole across the top end and fit a 70 mm piece of 6 mm rod as the T-handle.

Materiales para este paso:

Varilla roscadaVarilla roscada1 pieza
Tuerca hexagonalTuerca hexagonal4 piezas
Arandela planaArandela plana2 piezas
Redondo de acero dulceRedondo de acero dulce1 pieza

Herramientas necesarias:

Llave inglesa ajustableLlave inglesa ajustable
Taladro de columnaTaladro de columna
Juego de brocasJuego de brocas
Sierra para metalesSierra para metales
Martillo de bolaMartillo de bola
12

Assemble

Pin each arm pair together with its lower roller between the plates, and with short tubes as spacers on the pivot and spacer pins. Pin the arms into the block's forked ends. Fit the housing rollers in the housing's forks and the wheel on its shaft, with the flat spring screwed to the housing and sitting in the shaft's groove. Screw the block onto the screw, feed the arms down through the housing's forks inside its rollers, and rivet the guide's legs into the housing's grooves. Pin the arm springs to the block. Oil every pin and the screw.

Materiales para este paso:

Pasador de aceroPasador de acero8 piezas
Remaches de aceroRemaches de acero1 pieza
Tornillo de cabeza cilíndrica con hexágono interiorTornillo de cabeza cilíndrica con hexágono interior1 pieza

Herramientas necesarias:

Martillo de bolaMartillo de bola
GraneteGranete
Tornillo de bancoTornillo de banco
Juego de llaves AllenJuego de llaves Allen
Aceite de corteAceite de corte
13

Cut a copper tube

Mark a copper tube and hold it in a vice with soft jaws, or by hand for small tubes. Turn the handle to open the arms, put the cutter over the tube, and turn it back until the rollers lift the tube against the wheel. Check by eye that the wheel and rollers look evenly spaced. 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
14

Troubleshooting

Cam-arm tubing cutter troubleshooting.

Flow

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15

History and honest limits

**Simon Lutsker** of Shaker Heights, Ohio, US 2,870,536, dated 27 January 1959, filed 26 August 1957. He claimed "a guide block mounted for movement along said guide member and movable by said screw means, a pair of cammable members pivotally secured to said guide block" and the springs pressing their "arcuate cam surfaces" against the housing rollers. He said the contacts stay "substantially" equidistant; ours are set exactly 120 degrees apart. The patent gives no sizes or cam radius; all of ours are ours.

Materiales

13

Herramientas requeridas

29

Archivos de diseño

1

Este plano hace

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Cortatubos

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