Scientific American, Volume XXXVI., No. 8, February 24, 1877: A Weekly Journal of Practical Information, Art, Science,; Mechanics, Chemistry, and Manufactures.Various
Science
Scientific American, Volume XXXVI., No. 8, February 24, 1877: A Weekly Journal of Practical Information, Art, Science,; Mechanics, Chemistry, and Manufactures.
Various
Science -- Periodicals; Technology -- Periodicals
An English lathe, now in use at the Rogers Locomotive Works, Paterson,
N.J., contains several novel features. The ways are flat on the faces,
instead of having raised Vs; and this is a feature of all English
lathes, and of those known in this country as the Freeland lathes. A
great deal of discussion has at various times taken place as to the
relative qualification or merits of these two forms of lathe bed. The
advocates of the flat way, with Vs at the edges of the way, claim
superiority on the score of steadiness, increased wearing surface, and
strength; while, on behalf of the raised Vs, it is urged that, the Vs
being true, the saddle is bound to travel true, because there can be
no lost motion on the slides; whereas any lost motion, from want of
adjustment of the slides in flat ways, is liable to be reproduced
twofold in the work, for the reason that 1/100 of an inch lateral
movement of the slide carriage becomes 1/50 of an inch in the diameter
of the work. Then, again, the most of the wear upon a lathe bed takes
place at the part at and near the running center of the lathe, because
the saddle is, on account of short jobs, more used in that part than
on any other. As a result, when wear has taken place, the saddle, if
adjusted to suit the worn part, becomes too tight to travel over the
unworn part of the bed; and hence, after the wear has taken place, a
proper adjustment of the lathe saddle becomes impossible if the job is
a long one. In the case of raised Vs, however, the wear simply causes
the saddle to fall vertically, so that an amount of wear equal to
1/100 of an inch would have the same effect as lowering the tool 1/100
inch, its effect upon the work being almost imperceptible by ordinary
measurement. On the other hand, however, V lathes are usually made
with either a weight or a spring to keep the saddle down; and as a
result, when the cutting tool stands far out from the tool post, the
saddle is apt to tip, especially in the case of boring with a lathe
tool. In some cases, the raised Vs are accompanied with gibs to secure
the saddle; but in many instances the gibs are given too little
wearing surface. In the lathe above referred to, there are three ways
in one casting, with the slide angles on the outer edges. There are
also three separate and independent tail stocks fitting into the two
openings between the ways. The running head has one cone pulley
connected by suitable gearing to three face plates. The three centers
at the running head are stationary. The slide rest saddle spans the
three ways, having a V slide which contains three separate slide
rests, all connected by a nut to the feed screw, so that all three are
operated by the one screw. In addition to this, the two back slide
rests have the nuts so attached that they can be moved by means of a
separate screw, the object being to facilitate setting the cuts, since
it would be a tedious matter to set all three tools to an equal cut,
Public-domain text, read in full here on John Shaqi.
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