Scientific American, Vol. XXXIX.—No. 24. [New Series.], December 14, 1878: A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and ManufacturesVarious
Science
Scientific American, Vol. XXXIX.—No. 24. [New Series.], December 14, 1878: A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures
Various
Science -- Periodicals; Technology -- Periodicals
The live spindle should be enlarged at the face plate end, and tapered
at both ends, as indicated in the engraving.
The pulleys, which are of hard wood, are made of three pieces glued
together, bored, and driven on the spindle, secured by a pin passing
through both it and the spindle, and turned off. The bars forming the
shears may be either cold rolled iron or round machinery steel; they
will require no labor except perhaps squaring up at the ends. The
castings having been fitted to the bars, and provided with set screws
for clamping them, the two standards that support the live spindle and
the support for the opposite end of the bars are put in position, when
the bars are made truly parallel, and a little clay or putty is placed
around each bar and over the annular cavity that surrounds it, and is
formed into a spout or lip at the upper side to facilitate the pouring
of Babbitt metal. The metal must be quite hot when poured, so that
it will run sharp and fill the cavity. To guard against a possible
difficulty in removing the castings from the bars it might be well to
cover the side of the bar next the screw with a thin piece of paper.
The pieces of the tail stock and tool rest support are fitted to the
bars by means of Babbitt metal, the metal being poured first in one
half and then in the other. The bolts which clamp the two parts of the
rest support and tail stock together are provided with lever handles.
After fitting the parts to the two bars by means of Babbitt metal, the
tail spindle, which is threaded for half its length, is placed in the
tail stock parallel with the bars and Babbitted. A binding screw is
provided for clamping the tail spindle, and the spindle is drilled at
one end to receive the center, and has at the other end a crank for
operating it. A steel or bronze button is placed in the hole in the
standard that supports the smaller end of the live spindle, and the
spindle is supported in its working position and Babbitted.
The thread on the spindle should be rather coarse, so that wooden or
type metal face plates and chucks may be used.
The table shown in Fig. 1 is simple and inexpensive. It consists of
two pairs of crossed legs halved together and secured to a plank top.
A small rod passes through the rear legs near their lower ends, and
also through a piece of gas pipe placed between the legs. A diagonal
brace is secured to the top near one end, and is fastened to the lower
end of the rear leg at the other end of the table.
Public-domain text, read in full here on John Shaqi.
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