A.
Pitch diameter
B.
Outside diameter
C.
Number of teeth
D.
Addendum circle
E.
Circular pitch
F.
Addendum
G.
Dedendum
H.
Chordal pitch
I.
Diametral pitch
J.
Root diameter
K.
Clearance
L.
Whole depth
M.
Face
N.
Thickness
O.
Pitch circle
P.
Working depth
Q.
Rack teeth
Figure 2A
IN ANSWERING QUESTIONS 2-25 THROUGH
2-41 SELECT FROM THE GEAR NOMENCLATURE IN
FIGURE 2A THE TERM THAT IS DESCRIBED IN
THE QUESTION.
2-25.
2-26.
2-27.
2-28.
The diameter of the pitch circle
(or line) that equals the number of
teeth on the gear divided by the
diametral pitch.
1. A
2. B
3. C
4. D
The distance from center to center
of teeth measured along a straight
line or chord of the pitch circle.
1. F
2. G
3. H
4. I
The height of the tooth above the
pitch circle or the radial distance
between the pitch circle and the
top of the tooth.
1. B
2. C
3. D
4. F
The circle over the tops of the
teeth.
1. B
2. C
3. D
4. E
2-29.
2-30.
2-31.
2-32.
2-33.
2-34.
2-35
The number of teeth to each inch of
the pitch diameter or the number of
teeth on the gear divided by the
pitch diameter.
1. I
2. J
3. K
4. L
The distance from top of the tooth
to the bottom, including the
clearance.
1. J
2. K
3. L
4. M
A gear that may be compared to a
spur gear that has been
straightened out.
1. M
2. O
3. P
4. Q
The working surface of the tooth
over the pitch line.
1. L
2. M
3. N
4. O
The greatest depth to which a tooth
of one gear extends into the tooth
space of another gear.
1. N
2. O
3. P
4. Q
The diameter of the circle at the
root of the teeth.
1. I
2. J
3. K
4. L
The distance between the bottom of
a tooth and the top of a mating
tooth.
1. H
2. I
3. J
4. K
2-36.
The width of the tooth, taken as a
chord of the pitch circle.
1.
N
2.
O
3.
P
4.
Q
10
