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SHAFTING. 369
TABLE No. 44.—Dimensions of Couplings for Shafts.
(All dimensions in inches.)
Dimensions of Couplings. Diameter of
Coupling
Bolts.
Number of
of Shaft.
d D L /
Coupling
Bolts.
1%
2
2*
3
3/
2
4
4/2
5
3
±y
5
6
VA
8X
9
7
8
9
10
11*
13
14*
16*
17
4
4*
4^
5^
6
6^
7*
7^
#
H
U
%
%
%
1
1*
IX
H
%
y*
%
%
y*
1
4
4
4
4
5
5
6
6
6
BEARINGS.
A satisfactory rule is to make the length of the bearing for
line shafting six times the square root of the diameter of the
shaft.
Example.
What is a suitable length of bearings for a shaft of four
inches diameter ?
Solution
:
Length of bearing = 6 X VT^= 12 inches.
Some designers make the length of the bearing four times
its diameter.
Area of Bearing Surface.
The projected area of any bearing is always considered as
its bearing surface. Thus, the length of the bearing multiplied
by the diameter of the shaft gives the area of bearing surface.
For instance, the length of the box is twelve inches and the
diameter of the shaft is four inches ; the area of bearing surface
is 12 X 4 = 48 square inches.
Allowable Pressure in Bearings.
The allowable pressure per square inch of bearing surface
will depend on the surface speed of the shaft and the condition
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