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:
A PRACTICAL COURSE IN HOROLOGY
38
Substituting the numerical values
X
15.1
3.1416
= .592 mm. circular pitch
80
The proportion of for the wheels
tooth or leaf to space
is
usually
one half of the circular pitch.
:
for the pinions, 10 leaves or less
:
one third of the circular
pitch,
for the pinions,
12 leaves or more
:
two
fifths
of the
circular pitch.
Now,
continuing with the above example to determine the
width of the tooth of the wheel and the leaf of the pinion,
we
find that
.592
= .296 mm., the width of the tooth, and
2 .592
= .197 mm., the width of the
leaf.
Problems 1,
What
2.
Define diametrical pitch.
2.
Calculate the diametrical pitch for the following:
the epicycloid? the hypocycloid?
is
—
center distance
7.5 millimeters,
—75 pinion — 10 leaves. wheel 4.
teeth,
Calculate the pitch
diameter for the above wheel and
pinion. Calculate the full diameters.
in
5.
Define circular pitch.
6.
Calculate the circular pitch, using the specifications given
Problem
J.