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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

Imeundwa na

Martin

14. Oktoba 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".
Juu
A day for a pair

Maagizo

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.

Vifaa kwa hatua hii:

Ufito mviringo wa chuma lainiUfito mviringo wa chuma laini1 kipande

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Kereza ya ChumaKereza ya Chuma
Seti ya Zana za Kugeuza Mbao za HSSSeti ya Zana za Kugeuza Mbao za HSS
Mafuta ya kukatiaMafuta ya kukatia
Kalipa ya VernierKalipa 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.

Zana zinazohitajika:

Mashine ya kusaga chumaMashine ya kusaga chuma
Kichwa cha KugawanyaKichwa cha Kugawanya
Fito ya mandreliFito ya mandreli
Kikata gia cha involutiKikata gia cha involuti
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.

Zana zinazohitajika:

Mashine ya kusaga chumaMashine ya kusaga chuma
Kichwa cha KugawanyaKichwa cha Kugawanya
Kikata gia cha involutiKikata gia cha involuti
Mafuta ya kukatiaMafuta ya kukatia
Miwani ya usalamaMiwani ya usalama
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).

Zana zinazohitajika:

Kifaa cha kuondoa ukingoKifaa cha kuondoa ukingo
Kalipa ya VernierKalipa ya Vernier
5

Indexing 20 teeth

Inapakia daftari la Jupyter…

Vifaa

1

Zana Zinazohitajika

11

Mchoro huu unatengeneza

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Kishikilia nafasi

Seti ya gia nyooka (chuma, meno 20)

Free

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Dividing Head

Dividing Head

na MartinNO

TEKNOLOJIA

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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

Mitambo

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

Uchimbaji chuma

22
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