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BEARINGS. 373
Figure 5 shows a bearing
fitted into the frame of a ma-
chine, suitable for shafts from
one to three inches in diameter.
The cut shows a part of the
head-stock of a speed lathe
fitted with this kind of a bear-
ing. The bearing itself, which
may be of gun metal or cast
iron, is carefully fitted into the
frame by planing and scrap-
ing.
This kind of a bearing is
sometimes lined with babbitt,
but more frequently the spindle
is carefully fitted into the bear-
ing by scraping.
\J=*=e±l
d = Diameter of bearing; /–
id;
2d; a = 2% d-\- 1 inch;
b = 1 y
2 d -f- % inch ; c =1% d; e = f = 1% d + }i inch ;
f=e = l%d+y
s inch; g=Ud+ %mch; k = l%d+y%
inch ; i =2d. Diameter of screws = s
Aq d + 8
/i6 inch.
Figure 6 shows the form of a self-lining and self-oiling
bearing, very suitable for high-speed machinery, and used to a
great extent for dynamos and electric motors. The figure
shows a part of a dynamo frame with the box in section, cut
through the center line of bearing, and also a partly sectional
cut from the top. For dimensions see Table No. 46.
The bearing n n may be cast in one piece from gun metal, as
shown in the cut, or it may be (preferably for the larger size)
made in two parts. The seat for this box is turned in spherical
form on the outside, and a fit is obtained between this bearing
and the frame of the machine either by machining or by casting
in type metal or babbitt as shown at m m.
The loose rings, n n, are continually dipping into the
oil reservoir, and carrying oil to the shaft. (Chains are fre-
quently used instead of rings). The stop-rings should be set so
that the spindle has room for a little motion lengthwise in the
bearing. This will in a great measure prevent heating and cut-
ting, and by their peculiar shape the stop-rings will, by the
action of centrifugal force, throw the oil off at a a, to return to
the oil reservoir ; h h are plugs in the oil hole ; the screw i pre-
vents the box from turning with the shaft, and also forms a
convenient projection to take hold of when taking the cap off
of the bearing.
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