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37§ GEAR TEETH.
inch of pitch diameter. A gear of " ten diametral pitch " means
that the gear has ten teeth per inch of pitch diameter. A gear
of " twelve diametral pitch " means that the gear has twelve
teeth per inch of pitch diameter, etc.
Thus, the pitch diameter and, consequently, the distance
between the centers, will be a number which may be conven-
iently measured, and the dimensions of tooth parts are also
much more easily calculated by this system.
Rules for Calculating Dimensions of Gears According to
Diametral Pitch.
The pitch diameter is obtained by dividing the number of
teeth by the diametral pitch.
Example.
What is the pitch diameter of a gear of 48 teeth, 16 pitch ?
Solution
:
48 divided by 16 = 3, therefore the pitch diameter is 3
inches.
The number of teeth is obtained by multiplying the pitch
diameter by the diametral pitch.
Example.
What is the number of teeth in a gear of 5 inches pitch
diameter and 12 pitch ?
Solution
:
5X12 = 60, therefore the gear has 60 teeth.
The whole diameter of a spur gear is obtained by adding
2 to the number of teeth and dividing the sum by the diametral
pitch.
Example.
What is the whole diameter of a gear blank for 68 teeth,
10 pitch ?
Solution :
Whole diameter = ——— = 7 inches.
The number of teeth is obtained by multiplying the whole
diameter of the gear by the diametral pitch and subtracting 2
from the product.
Example.
The whole diameter of a gear blank is 8 inches ; it is to
be cut 10 diametral pitch. Find the number of teeth.
Solution
:
Number of teeth = (8 X 10) — 2 = 78.
The diametral pitch is obtained by adding 2 to the number
of teeth and dividing by the whole diameter.
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