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Spur Gears, 20 Teeth: Cut One Space at a Time on a Dividing Head
Brown & Sharpe Mfg. Co. (Wikimedia Commons) · Public domain
Martin

Yenziwe ngu-

Martin

14. uMfumfu 2026NO
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Spur Gears, 20 Teeth: Cut One Space at a Time on a Dividing Head

Without a hobbing machine, a spur gear is cut one tooth space at a time: a formed involute cutter on a milling machine, the blank turned by a dividing head between cuts. On a 40:1 head, a 20-tooth gear is two full turns of the crank per tooth. Eight involute cutters cover every gear from 12 teeth to a rack. The picture: cutting a spur gear with the spiral (dividing) head, from "A Practical Treatise on Milling and Milling Machines".
Osezingeni eliphezulu
A day for a pair

Imiyalelo

1

Turn the blanks

Saw two slices of round bar and turn each to the outside diameter the cutter's data gives for your module and 20 teeth. Bore the centre to fit the mandrel and face both sides.

Izinto zokwakha zalesi sinyathelo:

Induku eyindilinga yensimbi ethambileInduku eyindilinga yensimbi ethambile1 ucezu

Amathuluzi adingekayo:

Isaha SensimbiIsaha Sensimbi
Umshini Wokuphendula InsimbiUmshini Wokuphendula Insimbi
Isethi Yamathuluzi e-HSS Okuphendula IzinkuniIsethi Yamathuluzi e-HSS Okuphendula Izinkuni
Uwoyela wokusikaUwoyela wokusika
I-Vernier CaliperI-Vernier Caliper
2

Set up the head

Press a blank onto the mandrel and mount it between the dividing head and its tailstock on the milling table. Fit the involute cutter for 20 teeth of that module and centre it over the blank.

Amathuluzi adingekayo:

Umshini Wokusika InsimbiUmshini Wokusika Insimbi
Ikhanda LokuhlukanisaIkhanda Lokuhlukanisa
Insimbi ye-mandrelInsimbi ye-mandrel
Isisiki samagiya se-involuteIsisiki samagiya se-involute
3

Cut, index, cut

Set the depth from the cutter's data, cut the first space with oil, back off, give the crank two full turns, and cut the next. Repeat until all 20 spaces are cut and you are back at the first.

Amathuluzi adingekayo:

Umshini Wokusika InsimbiUmshini Wokusika Insimbi
Ikhanda LokuhlukanisaIkhanda Lokuhlukanisa
Isisiki samagiya se-involuteIsisiki samagiya se-involute
Uwoyela wokusikaUwoyela wokusika
Izibuko zokuphephaIzibuko zokuphepha
4

Second gear and deburr

Cut the second blank the same way. Deburr the tooth edges and check that the pair mesh smoothly at their centre distance (the sum of the two pitch radii).

Amathuluzi adingekayo:

Ithuluzi lokususa amabhadiIthuluzi lokususa amabhadi
I-Vernier CaliperI-Vernier Caliper
5

Indexing 20 teeth

Ilayisha incwadi ye-Jupyter…

Izinto

1

Amathuluzi Adingekayo

11

Le blueprint yenza

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Isibambeli

Isethi yamagiya aqondile (insimbi, amazinyo angu-20)

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Ama-blueprint ahlobene

Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso

Dividing Head

Dividing Head

ngu-MartinNO

UBUCHWEPHESHE

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The Involute: Why Gear Teeth Are That Shape and No Other

The Involute: Why Gear Teeth Are That Shape and No Other

ngu-MartinNO

Ezomshini

60
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Steel Shaft, 30 mm: Round Bar Turned Between Centres

Steel Shaft, 30 mm: Round Bar Turned Between Centres

ngu-MartinNO

Umsebenzi Wensimbi

22
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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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