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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. Ugushyingo 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.
Hejuru
About 4 days

Amabwiriza

1

Three points evenly round

Gupakira ikaye ya 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).
Dosiye y'IgishushanyoPDFCC0 - Free
Kuramo icyitegererezo
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.

Ibikoresho by'iyi ntambwe:

Ikibaho cy'icyuma cyorohejeIkibaho cy'icyuma cyoroheje1 igice

Ibikoresho bikenewe:

Umucumita w'IbyumaUmucumita w'Ibyuma
Amakariso MenshiAmakariso Menshi
Ikusanyirizo ry'Amakariso MatoIkusanyirizo ry'Amakariso Mato
Icyuma Cyivumbura GihagazeIcyuma Cyivumbura Gihagaze
Ifatiro ry'imashiniIfatiro ry'imashini
Ibyuma Byinshi byo GucukuraIbyuma Byinshi byo Gucukura
Igicukuzi cyo Gushyira IkimenyetsoIgicukuzi cyo Gushyira Ikimenyetso
Ifatiro ry'AmezaIfatiro ry'Ameza
Ikigereranyo cya Digitale cy'Amasentimetero 6Ikigereranyo cya Digitale cy'Amasentimetero 6
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.

Ibikoresho by'iyi ntambwe:

Umurongo ugororotse w'icyuma cyoroshyeUmurongo ugororotse w'icyuma cyoroshye1 igice

Ibikoresho bikenewe:

Umucumita w'IbyumaUmucumita w'Ibyuma
Amakariso MenshiAmakariso Menshi
Icyuma Cyivumbura GihagazeIcyuma Cyivumbura Gihagaze
Ifatiro ry'imashiniIfatiro ry'imashini
Ibyuma Byinshi byo GucukuraIbyuma Byinshi byo Gucukura
Ifatiro ry'AmezaIfatiro ry'Ameza
Ikigereranyo cya Digitale cy'Amasentimetero 6Ikigereranyo cya Digitale cy'Amasentimetero 6
Igikoresho Gishushanya ImirongoIgikoresho Gishushanya Imirongo
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.

Ibikoresho by'iyi ntambwe:

Umurongo ugororotse w'icyuma cyoroshyeUmurongo ugororotse w'icyuma cyoroshye2 ibice

Ibikoresho bikenewe:

Umucumita w'IbyumaUmucumita w'Ibyuma
Amakariso MenshiAmakariso Menshi
Icyuma Cyivumbura GihagazeIcyuma Cyivumbura Gihagaze
Ifatiro ry'imashiniIfatiro ry'imashini
Ibyuma Byinshi byo GucukuraIbyuma Byinshi byo Gucukura
Agakoresho ko gukata imizingo y'ibyumaAgakoresho ko gukata imizingo y'ibyuma
Ifatiro ry'AmezaIfatiro ry'Ameza
Inyundo ifite umutwe wa burutaInyundo ifite umutwe wa buruta
Ikigereranyo cya Digitale cy'Amasentimetero 6Ikigereranyo cya Digitale cy'Amasentimetero 6
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.

Ibikoresho by'iyi ntambwe:

Umurongo uziguye w'icyuma cyorohejeUmurongo uziguye w'icyuma cyoroheje1 igice
Umurongo Uzengurutse w'Icyuma CyoroshyeUmurongo Uzengurutse w'Icyuma Cyoroshye1 igice

Ibikoresho bikenewe:

Imashini yo guhinguza icyumaImashini yo guhinguza icyuma
Igikoresho gifata cy'ibirenge 3 cy'imashini ihinguraIgikoresho gifata cy'ibirenge 3 cy'imashini ihingura
Icyuma cyo kuca cy'itoreroIcyuma cyo kuca cy'itorero
Icyuma cyo guca ku ruzigaIcyuma cyo guca ku ruziga
Ibyuma Byinshi byo GucukuraIbyuma Byinshi byo Gucukura
Amakariso MenshiAmakariso Menshi
Ikigereranyo cya Digitale cy'Amasentimetero 6Ikigereranyo cya Digitale cy'Amasentimetero 6
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.

Ibikoresho by'iyi ntambwe:

Inkoni y'icyuma cy'ibikoreshoInkoni y'icyuma cy'ibikoresho1 igice

Ibikoresho bikenewe:

Imashini yo guhinguza icyumaImashini yo guhinguza icyuma
Igikoresho gifata cy'ibirenge 3 cy'imashini ihinguraIgikoresho gifata cy'ibirenge 3 cy'imashini ihingura
Icyuma cyo kuca cy'itoreroIcyuma cyo kuca cy'itorero
Icyuma cyo guca ku ruzigaIcyuma cyo guca ku ruziga
Agatsiko k'ibitobora hagatiAgatsiko k'ibitobora hagati
Ibyuma Byinshi byo GucukuraIbyuma Byinshi byo Gucukura
Ikigereranyo cya Digitale cy'Amasentimetero 6Ikigereranyo cya Digitale cy'Amasentimetero 6
Amadarubindi y'umutekanoAmadarubindi y'umutekano
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.

Ibikoresho bikenewe:

Iziko ryo GucuraIziko ryo Gucura
Amakoro y'UmucuziAmakoro y'Umucuzi
Magineti ntoMagineti nto
Indobo yo gukonjeshaIndobo yo gukonjesha
AmaziAmazi
Ibuye ryo gutyazaIbuye ryo gutyaza
Uturindantoki two gukomeza ibyumaUturindantoki two gukomeza ibyuma
Amadarubindi y'umutekanoAmadarubindi y'umutekano
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.

Ibikoresho by'iyi ntambwe:

Umurongo w'icyuma cya sipringiUmurongo w'icyuma cya sipringi1 igice

Ibikoresho bikenewe:

Umucumita w'IbyumaUmucumita w'Ibyuma
Amakariso MenshiAmakariso Menshi
Icyuma Cyivumbura GihagazeIcyuma Cyivumbura Gihagaze
Ibyuma Byinshi byo GucukuraIbyuma Byinshi byo Gucukura
Ifatiro ry'AmezaIfatiro ry'Ameza
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.

Ibikoresho by'iyi ntambwe:

Inkoni ifite imirongoInkoni ifite imirongo1 igice
Umupira w'Impande EsheshatuUmupira w'Impande Esheshatu4 ibice
Uruziga RurambuyeUruziga Rurambuye2 ibice
Umurongo Uzengurutse w'Icyuma CyoroshyeUmurongo Uzengurutse w'Icyuma Cyoroshye1 igice

Ibikoresho bikenewe:

Isupana ihindurwaIsupana ihindurwa
Icyuma Cyivumbura GihagazeIcyuma Cyivumbura Gihagaze
Ibyuma Byinshi byo GucukuraIbyuma Byinshi byo Gucukura
Umucumita w'IbyumaUmucumita w'Ibyuma
Inyundo ifite umutwe wa burutaInyundo ifite umutwe wa buruta
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.

Ibikoresho by'iyi ntambwe:

Umusumari w'icyumaUmusumari w'icyuma8 ibice
Utuma tw'icyumaUtuma tw'icyuma1 igice
Insimburangingo Ifite Umutwe UzengurutseInsimburangingo Ifite Umutwe Uzengurutse1 igice

Ibikoresho bikenewe:

Inyundo ifite umutwe wa burutaInyundo ifite umutwe wa buruta
Igicukuzi cyo Gushyira IkimenyetsoIgicukuzi cyo Gushyira Ikimenyetso
Ifatiro ry'AmezaIfatiro ry'Ameza
Umutwe w'imfunguzo z'impande esheshatuUmutwe w'imfunguzo z'impande esheshatu
Amavuta yo gukataAmavuta yo gukata
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.

Ibikoresho by'iyi ntambwe:

Umuyoboro w'umuringaUmuyoboro w'umuringa1 igice

Ibikoresho bikenewe:

Ifatiro ry'AmezaIfatiro ry'Ameza
Igikoresho cyo gukuraho ibisigazwa ku mperaIgikoresho cyo gukuraho ibisigazwa ku mpera
Ikigereranyo cya Digitale cy'Amasentimetero 6Ikigereranyo cya Digitale cy'Amasentimetero 6
14

Troubleshooting

Cam-arm tubing cutter troubleshooting.

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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.

Ibikoresho

13

Ibikoresho bikenewe

29

Dosiye z'igishushanyo

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Iki gishushanyo gikora

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