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module and diametral pitch

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Module and Diametral Pitch The module of a gear shows how much is big the teeth. The module multiplied for the number of teeth gives the pitch diameter, and the module multiplied for gives the value of the pitch.. We can call the module (measured in mm), the diametral pitch . With: m = modulo in mm e m dp = diametral pitch We have the following formulas: = 25,4 (in mm) = 25,4 (numero puro) A gear with a module 1 16 ∙ 25,4 have a Diametral Pitch 16 (m = 1,5875 mm). The following table are the relationship between the module and the Diametral Pitch and vice-versa Relationship between Module and Diametral Pitch Module Diametral Pitch Module Diametral Pitch Module Diametral Pitch Module Diametral Pitch 0,50 50,8000 3,75 6,7733 8,00 3,1750 19 1,3368 0,75 33,8666 4,00 6,3500 8,50 2,9882 20 1,2700 1,00 25,4000 4,25 5,9765 9,00 2,8222 22 1,1545 1,25 20,3200 4,50 5,6444 9,50 2,6737 24 1,0583 1,50 16,9333 4,75 5,3474 10 2,5400 26 0,9769 1,75 14,5143 5,00 5,0800 11 2,3091 28 0,9071 2,00 12,7000 5,25 4,8381 12 2,1167 30 0,8467 2,25 11,2889 5,50 4,6182 13 1,9538 32 0,7937 2,50 10,1500 5,75 4,4174 14 1,8143 34 0,7471 2,75 9,2364 6,00 4,2333 15 1,6933 36 0,7056 3,00 8,4667 6,50 3,9077 16 1,5875 38 0,6684 3,25 7,8154 7,00 3,6286 17 1,4941 40 0,6350 3,50 7,2572 7,50 3,3867 18 1,4111 -- -- Relationship between Diametral Pitch and Module Diametral Pitch Module Diametral Pitch Module Diametral Pitch Module Diametral Pitch Module 48 0,5292 13 1,9538 5 1/2 4,6182 2 1/4 11,2889 44 0,5773 12 2,1167 5 1/4 4,8381 2 12,7000 40 0,6350 11 2,3091 5 5,0800 1 7/8 13,5467 36 0,7056 10 2,5400 4 3/4 5,3474 1 3/4 14,5143 32 0,7937 9 1/2 2,6737 4 1/2 5,6444 1 5/8 15,6308 28 0,9071 9 2,8222 4 1/4 5,9765 1 1/2 16,9333 24 1,0583 8 1/2 2,9882 4 6,3500 1 3/8 18,4727 20 1,2700 8 3,1750 3 3/4 6,7733 1 1/4 20,3200 18 1,4111 7 1/2 3,3867 3 1/2 7,2572 1 1/8 22,5778 17 1,4941 7 3,6286 3 1/4 7,8154 1 25,4000 16 1,5875 6 1/2 3,9077 3 8,4667 .7/8 29,0286 15 1,6933 6 4,2333 2 3/4 9,2364 .3/4 33,8666 14 1,8143 5 3/4 4,4174 2 1/2 10,1500 .5/8 40,6400 -- -- -- -- -- -- 1/2 50,8000

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Page 1: Module and Diametral Pitch

Module and Diametral Pitch The module of a gear shows how much is big the teeth. The module multiplied for the number of teeth gives the pitch diameter, and the module

multiplied for 𝜋 gives the value of the pitch..

We can call the module (measured in mm), the diametral pitch . With: m = modulo in mm e mdp = diametral pitch We have the following formulas:

𝑚 =25,4

𝑚𝑑𝑝 (in mm) 𝑚𝑑𝑝 =

25,4

𝑚 (numero puro)

A gear with a module 1

16∙ 25,4 have a Diametral Pitch 16 (m = 1,5875 mm).

The following table are the relationship between the module and the Diametral Pitch and vice-versa Relationship between Module and Diametral Pitch

Module Diametral

Pitch Module

Diametral Pitch

Module Diametral

Pitch Module

Diametral Pitch

0,50 50,8000 3,75 6,7733 8,00 3,1750 19 1,3368

0,75 33,8666 4,00 6,3500 8,50 2,9882 20 1,2700

1,00 25,4000 4,25 5,9765 9,00 2,8222 22 1,1545

1,25 20,3200 4,50 5,6444 9,50 2,6737 24 1,0583

1,50 16,9333 4,75 5,3474 10 2,5400 26 0,9769

1,75 14,5143 5,00 5,0800 11 2,3091 28 0,9071

2,00 12,7000 5,25 4,8381 12 2,1167 30 0,8467

2,25 11,2889 5,50 4,6182 13 1,9538 32 0,7937

2,50 10,1500 5,75 4,4174 14 1,8143 34 0,7471

2,75 9,2364 6,00 4,2333 15 1,6933 36 0,7056

3,00 8,4667 6,50 3,9077 16 1,5875 38 0,6684

3,25 7,8154 7,00 3,6286 17 1,4941 40 0,6350

3,50 7,2572 7,50 3,3867 18 1,4111 -- --

Relationship between Diametral Pitch and Module

Diametral Pitch

Module Diametral

Pitch Module

Diametral Pitch

Module Diametral

Pitch Module

48 0,5292 13 1,9538 5 1/2 4,6182 2 1/4 11,2889

44 0,5773 12 2,1167 5 1/4 4,8381 2 12,7000

40 0,6350 11 2,3091 5 5,0800 1 7/8 13,5467

36 0,7056 10 2,5400 4 3/4 5,3474 1 3/4 14,5143

32 0,7937 9 1/2 2,6737 4 1/2 5,6444 1 5/8 15,6308

28 0,9071 9 2,8222 4 1/4 5,9765 1 1/2 16,9333

24 1,0583 8 1/2 2,9882 4 6,3500 1 3/8 18,4727

20 1,2700 8 3,1750 3 3/4 6,7733 1 1/4 20,3200

18 1,4111 7 1/2 3,3867 3 1/2 7,2572 1 1/8 22,5778

17 1,4941 7 3,6286 3 1/4 7,8154 1 25,4000

16 1,5875 6 1/2 3,9077 3 8,4667 .7/8 29,0286

15 1,6933 6 4,2333 2 3/4 9,2364 .3/4 33,8666

14 1,8143 5 3/4 4,4174 2 1/2 10,1500 .5/8 40,6400

-- -- -- -- -- -- 1/2 50,8000

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