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Worm and Worm Wheel: a Steel Screw and a Hobbed Bronze Wheel
Martin

Dicipta oleh

Martin

14. Oktober 2026NO
18
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Worm and Worm Wheel: a Steel Screw and a Hobbed Bronze Wheel

A worm is a screw that drives a toothed wheel at right angles; with a single-start worm each turn moves the wheel one tooth, so a 30-tooth wheel gives 30:1. Cut the worm on a screw-cutting lathe, make a hob that is a copy of it with cutting edges, gash the bronze wheel on the dividing head, then run the hob through it to finish the teeth. The picture: a worm shaft with its bearings and a hobbed bronze worm wheel from a gearbox.
Lanjutan
Three to four days

Arahan

1

Cut the worm

Turn the steel bar to the worm's diameter and set the lathe's change gears to the axial pitch (π × module). Cut the single-start thread with a tool ground to the tooth form, checking it with the gauge.

Bahan untuk langkah ini:

Bar bulat keluli lembutBar bulat keluli lembut1 keping

Alatan diperlukan:

Mesin Pelarik LogamMesin Pelarik Logam
Set pahat larik keluli laju tinggiSet pahat larik keluli laju tinggi
Tolok ulirTolok ulir
Angkup VernierAngkup Vernier
Minyak pemotongMinyak pemotong
2

Make the hob

Cut the same thread a little oversize on tool steel, file four or more lengthwise flutes across it to make cutting edges, back off behind each edge, then harden and temper it.

Bahan untuk langkah ini:

Bar keluli alat segi lapanBar keluli alat segi lapan1 keping

Alatan diperlukan:

Mesin Pelarik LogamMesin Pelarik Logam
Kikir LogamKikir Logam
Relau tukang besiRelau tukang besi
Baldi pelindapkejutanBaldi pelindapkejutan
Cermin mata keselamatanCermin mata keselamatan
3

Cast and turn the wheel blank

Melt bronze in a crucible, cast a round blank, and turn it on a mandrel to the wheel's diameter with a hollow rim to wrap the worm.

Bahan untuk langkah ini:

Jongkong gangsaJongkong gangsa1 kg
ArangArang1 as required

Alatan diperlukan:

Relau tukang besiRelau tukang besi
Mangkuk Pijar Tanah Liat Tahan ApiMangkuk Pijar Tanah Liat Tahan Api
Penyepit Mangkuk PijarPenyepit Mangkuk Pijar
Acuan jongkongAcuan jongkong
Mesin Pelarik LogamMesin Pelarik Logam
Rod mandrelRod mandrel
Sarung tangan kimpalanSarung tangan kimpalan
4

Gash the teeth

Mount the blank on the dividing head with the cutter path set at the worm's lead angle and cut a slot for every tooth, nearly to depth.

Alatan diperlukan:

Mesin Kisar LogamMesin Kisar Logam
Kepala PembahagiKepala Pembahagi
Minyak pemotongMinyak pemotong
5

Hob to shape

Run the hob in mesh with the gashed blank, free to turn, feeding it in gradually to full depth: it drives the blank round and generates the true tooth form.

Alatan diperlukan:

Mesin Kisar LogamMesin Kisar Logam
Pemotong hob roda cacingPemotong hob roda cacing
Minyak pemotongMinyak pemotong
6

Sizes for a 30:1 set

Memuatkan buku nota Jupyter…
7

Limits

Worm drive principles, gashing and hobbing are as Wikipedia describes them; the module, tooth count and making the hob from the worm's own thread are ours. A single-start set like this is usually self-locking, which depends on lead angle and friction.

Bahan

4

Alatan Diperlukan

17

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