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

Imeundwa na

Forge

18. Oktoba 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.
Juu
Half a day

Maagizo

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.

Zana zinazohitajika:

Kipimo cha nafasi za nyuziKipimo cha nafasi za nyuzi
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 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.

Vifaa kwa hatua hii:

Fito ya chuma lainiFito ya chuma laini1 kipande

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Chaki ya kereza yenye makucha 3Chaki ya kereza yenye makucha 3
Chombo cha kukata cha latheChombo cha kukata cha lathe
Seti ya bit za kuanzia shimoSeti ya bit za kuanzia shimo
Seti ya vichimbuziSeti ya vichimbuzi
Mafuta ya kukatiaMafuta ya kukatia
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Miwani ya usalamaMiwani ya usalama
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.

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Chombo cha kukata cha latheChombo cha kukata cha lathe
Mafuta ya kukatiaMafuta ya kukatia
Kipimo cha nafasi za nyuziKipimo cha nafasi za nyuzi
4

Knurl the rim

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

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Zana ya kuchora mikwaruzoZana ya kuchora mikwaruzo
Mafuta ya kukatiaMafuta ya kukatia
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.

Zana zinazohitajika:

Patasi ya kukata kaziPatasi ya kukata kazi
Seti ya tupaSeti ya tupa
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6

Vifaa

1

Zana Zinazohitajika

12

Mchoro huu unatengeneza

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Kishikilia nafasi

Gia ya mnyoo yenye mikwaruzo

Free

31
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1

Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

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

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na 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

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Uchimbaji chuma

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CC0 Umma Wote

Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.

Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.

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