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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

Yaremwe na

Martin

14. Ukwakira 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".
Hejuru
A day for a pair

Amabwiriza

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.

Ibikoresho by'iyi ntambwe:

Umurongo uziguye w'icyuma cyorohejeUmurongo uziguye w'icyuma cyoroheje1 igice

Ibikoresho bikenewe:

Umucumita w'IbyumaUmucumita w'Ibyuma
Imashini yo guhinguza icyumaImashini yo guhinguza icyuma
Ibikoresho byo Kuzenguruka Ibiti bya HSSIbikoresho byo Kuzenguruka Ibiti bya HSS
Amavuta yo gukataAmavuta yo gukata
Kalipe ya VernierKalipe ya Vernier
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.

Ibikoresho bikenewe:

Imashini ibaza icyumaImashini ibaza icyuma
Umutwe wo KugabanyaUmutwe wo Kugabanya
Inkoni ya mandrelInkoni ya mandrel
Igikata amenyo ya gerere cya involuteIgikata amenyo ya gerere cya 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.

Ibikoresho bikenewe:

Imashini ibaza icyumaImashini ibaza icyuma
Umutwe wo KugabanyaUmutwe wo Kugabanya
Igikata amenyo ya gerere cya involuteIgikata amenyo ya gerere cya involute
Amavuta yo gukataAmavuta yo gukata
Amadarubindi y'umutekanoAmadarubindi y'umutekano
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).

Ibikoresho bikenewe:

Igikoresho cyo gukuraho ibisigazwa ku mperaIgikoresho cyo gukuraho ibisigazwa ku mpera
Kalipe ya VernierKalipe ya Vernier
5

Indexing 20 teeth

Gupakira ikaye ya Jupyter…

Ibikoresho

1

Ibikoresho bikenewe

11

Iki gishushanyo gikora

Thumbnail
Agateganyo

Agasanduku k'amahwa agororotse (icyuma, amenyo 20)

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Blueprint zijyanye

Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame

Dividing Head

Dividing Head

na MartinNO

IKORANABUHANGA

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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

na MartinNO

Mekanike

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

Steel Shaft, 30 mm: Round Bar Turned Between Centres

na MartinNO

Ubucuzi bw'Ibyuma

22
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CC0 Umurenge rusange

Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.

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