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REVERSE ENGINEERING
IZAYENSI
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Knurled Worm Gear for an Adjustable Spanner, Thread Cut to the Rack
Foster A. Haist · Public domain
Forge

Yenziwe ngu-

Forge

18. uMfumfu 2026NO
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Knurled Worm Gear for an Adjustable Spanner, Thread Cut to the Rack

The worm of an adjustable spanner is a short screw on a pin: its thread engages the rack on the movable jaw, so turning it with the thumb opens or closes the jaw, and its rim is knurled for grip (Haist, US 2,112,840, 1938). This one is turned from mild steel, its thread cut on the lathe to the pitch of the jaw's rack. Method and sizes are ours. The picture: Haist's patent drawing.
Osezingeni eliphezulu
Half a day

Imiyalelo

1

Measure the rack

Measure the pitch of the teeth on the movable jaw's rack with the pitch gauge, and the height of the opening the worm sits in.

Amathuluzi adingekayo:

Isilinganiso sebanga lomsontwanaIsilinganiso sebanga lomsontwana
I-Caliper Yedijithali Yamayintshi Ayi-6I-Caliper Yedijithali Yamayintshi Ayi-6
2

Turn and bore

Chuck the mild steel bar, face it, turn it to the worm's outside diameter, and centre-drill and drill it through for the pin.

Izinto zokwakha zalesi sinyathelo:

Ibha yensimbi ethambileIbha yensimbi ethambile1 ucezu

Amathuluzi adingekayo:

Umshini Wokuphendula InsimbiUmshini Wokuphendula Insimbi
Isibambi somshini wokuphenda esinemilomo emithathuIsibambi somshini wokuphenda esinemilomo emithathu
Ithuluzi lokusika le-latheIthuluzi lokusika le-lathe
Isethi yamabhitha okuqala imboboIsethi yamabhitha okuqala imbobo
Iqoqo Lamakhanda EbholaIqoqo Lamakhanda Ebhola
Uwoyela wokusikaUwoyela wokusika
I-Caliper Yedijithali Yamayintshi Ayi-6I-Caliper Yedijithali Yamayintshi Ayi-6
Izibuko zokuphephaIzibuko zokuphepha
3

Cut the thread

Set the lathe's gearing to the rack's pitch and single-point cut the thread along the worm's length, testing against the rack until it runs smoothly.

Amathuluzi adingekayo:

Umshini Wokuphendula InsimbiUmshini Wokuphendula Insimbi
Ithuluzi lokusika le-latheIthuluzi lokusika le-lathe
Uwoyela wokusikaUwoyela wokusika
Isilinganiso sebanga lomsontwanaIsilinganiso sebanga lomsontwana
4

Knurl the rim

Run the knurling tool lightly over the thread crests to roughen them for the thumb, without closing the thread.

Amathuluzi adingekayo:

Umshini Wokuphendula InsimbiUmshini Wokuphendula Insimbi
Ithuluzi le-knurlingIthuluzi le-knurling
Uwoyela wokusikaUwoyela wokusika
5

Part off and fit

Part the worm off a little short of the opening's height, file off the burrs, and check it turns freely on its pin in the opening.

Amathuluzi adingekayo:

Insimbi yokuhlukanisa emshinini wokuphothaInsimbi yokuhlukanisa emshinini wokuphotha
Iqoqo LamafayelaIqoqo Lamafayela
I-Caliper Yedijithali Yamayintshi Ayi-6I-Caliper Yedijithali Yamayintshi Ayi-6

Izinto

1

Amathuluzi Adingekayo

12

Le blueprint yenza

Thumbnail
Isibambeli

I-worm gear ene-knurl

Free

31
0
1

Ama-blueprint ahlobene

Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso

Adjustable Spanner: One-Piece Forging, Broached Guide and Worm

Adjustable Spanner: One-Piece Forging, Broached Guide and Worm

ngu-ForgeNO

Steel & Iron

35
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Single-Point Screw Cutting: Making a Thread the Lathe Has Never Seen

Single-Point Screw Cutting: Making a Thread the Lathe Has Never Seen

ngu-MartinNO

Umsebenzi Wensimbi

50
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CC0 Isizinda Somphakathi

Le blueprint ikhishwe ngaphansi kwe-CC0. Ukhululekile ukukopisha, ukuguqula, ukusabalalisa, nokusebenzisa ngaphandle kwemvume.

Sekela uMenzi ngokuthenga imikhiqizo nge-Blueprint yabo IKhomishane Yomenzi kumiswe ngabathengisi, noma dala inguqulo entsha yale Blueprint bese uyifaka njengoxhumaniso ku-Blueprint yakho ukuze wabelane ngemali engenayo.

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