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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
Forge

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13. November 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.
Fortgeschritten
About 3 days

Anweisungen

1

The swing that lets go

Jupyter-Notebook wird geladen …
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).
DesigndateiPDFCC0 - Free
Modell herunterladen
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.

Materialien für diesen Schritt:

BaustahlplatteBaustahlplatte1 Stück

Benötigte Werkzeuge:

Bügelsäge (Metallsäge)Bügelsäge (Metallsäge)
FeilensatzFeilensatz
StandbohrmaschineStandbohrmaschine
MaschinenschraubstockMaschinenschraubstock
BohrersatzBohrersatz
KörnerKörner
ReißnadelReißnadel
SchraubstockSchraubstock
Digitaler Messschieber 6 ZollDigitaler Messschieber 6 Zoll
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.

Materialien für diesen Schritt:

BaustahlplatteBaustahlplatte1 Stück

Benötigte Werkzeuge:

Bügelsäge (Metallsäge)Bügelsäge (Metallsäge)
FeilensatzFeilensatz
NadelfeilensatzNadelfeilensatz
StandbohrmaschineStandbohrmaschine
MaschinenschraubstockMaschinenschraubstock
BohrersatzBohrersatz
SchraubstockSchraubstock
Digitaler Messschieber 6 ZollDigitaler Messschieber 6 Zoll
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.

Benötigte Werkzeuge:

StandbohrmaschineStandbohrmaschine
MaschinenschraubstockMaschinenschraubstock
BohrersatzBohrersatz
GewindeschneidsatzGewindeschneidsatz
SchneidölSchneidöl
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.

Materialien für diesen Schritt:

Rundstahl aus BaustahlRundstahl aus Baustahl1 Stück
Rundstahl (Baustahl)Rundstahl (Baustahl)1 Stück

Benötigte Werkzeuge:

MetalldrehmaschineMetalldrehmaschine
Dreibackenfutter für die DrehmaschineDreibackenfutter für die Drehmaschine
DrehmeißelDrehmeißel
AbstechstahlAbstechstahl
GewindeschneidsatzGewindeschneidsatz
StandbohrmaschineStandbohrmaschine
BohrersatzBohrersatz
Bügelsäge (Metallsäge)Bügelsäge (Metallsäge)
Digitaler Messschieber 6 ZollDigitaler Messschieber 6 Zoll
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.

Materialien für diesen Schritt:

WerkzeugstahlstangeWerkzeugstahlstange1 Stück

Benötigte Werkzeuge:

MetalldrehmaschineMetalldrehmaschine
Dreibackenfutter für die DrehmaschineDreibackenfutter für die Drehmaschine
DrehmeißelDrehmeißel
AbstechstahlAbstechstahl
Satz ZentrierbohrerSatz Zentrierbohrer
BohrersatzBohrersatz
Digitaler Messschieber 6 ZollDigitaler Messschieber 6 Zoll
SchutzbrilleSchutzbrille
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.

Benötigte Werkzeuge:

EsseEsse
SchmiedezangeSchmiedezange
Kleiner MagnetKleiner Magnet
AbschreckbottichAbschreckbottich
WasserWasser
SchleifsteinSchleifstein
SchweißerhandschuheSchweißerhandschuhe
SchutzbrilleSchutzbrille
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.

Materialien für diesen Schritt:

Zylinderstift aus StahlZylinderstift aus Stahl5 Stück
DruckfedernsortimentDruckfedernsortiment1 Stück
FederstahlbandFederstahlband1 Stück
StahlnietenStahlnieten2 Stück
Rundstahl (Baustahl)Rundstahl (Baustahl)1 Stück

Benötigte Werkzeuge:

Schlosserhammer mit KugelfinneSchlosserhammer mit Kugelfinne
KörnerKörner
SchraubstockSchraubstock
StandbohrmaschineStandbohrmaschine
BohrersatzBohrersatz
SchneidölSchneidöl
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.

Materialien für diesen Schritt:

KupferrohrKupferrohr1 Stück

Benötigte Werkzeuge:

SchraubstockSchraubstock
EntgraterEntgrater
Digitaler Messschieber 6 ZollDigitaler Messschieber 6 Zoll
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.

Materialien

9

Benötigte Werkzeuge

27

Designdateien

1

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