This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1906 Excerpt: ...construction of the keying-device, the cams tend
to become more tightly wedged in working, and when it is desired to
remove them they are easily loosened by a few blows on the toe of
the cam. A set of five cams of this pattern can be fixed in 10
minutes. The cam-shaft illustrated in Fig. 18, Plate 5, is 7 feet
10 inches in length and 6 inches in diameter, turned down at the
ends to inches to run in sunk bearings, which are 12 inches in
length in the centre king-post and 9 inches in length in the outer
posts. The hearings for the cam-shafts are usually made in a
box-casting lined with Babbitt-metal or some similar alloy. There
are, however, objections to the use of these alloys on account of
their tendency to crumble under the continuous shocks to which the
cam-shaft is subjected, and to fall into the mortar-box and
eventually form base amalgam, which is not only deceptive in
itself, but causes losses in refining. The form of bearing now
adopted by the Author is one of plain cast-iron (Figs. 22, Plate
5), turned to the diameter of the crank-shaft journals, and giving
ample bearing-surface. This form of bearing, when lubricated with a
mixture of graphite and grease, is most satisfactory. It causes no
loss of time from re-metalling bearings and does not interfere with
the process of amalgamation. The cam-shaft pulleys, K2 (Figs. 26,
Plate 5), are built of wellseasoned clear pine timbers, d, l inch
in thickness, securely bolted with -inch bolts, e, to a cast-iron
centre, a. The plate, b, is secured to the boss, a, by keys, c.
Great care must be taken in building the pulleys to see that each
layer of timber is well bedded, glued and firmly screwed to the
others. An iron pulley is unsuitable for the work owing to the
shocks carried through from ...
|Country of origin:
Institution of Civil Engineers
||246 x 189 x 10mm (L x W x T)
||Paperback - Trade
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