This historic book may have numerous typos and missing text.
Purchasers can usually download a free scanned copy of the original
book (without typos) from the publisher. Not indexed. Not
illustrated. 1903 edition. Excerpt: ...The Fellows Gear Shaper goes
back to first principles and generates its tooth form from flat and
circular surfaces which can be made absolutely true and can be
proven to be so. The work is done automatically, by a circular
cutter of the correct pitch. An example of the work produced is
shown in fig. 160. This is effected as follows: The blank to be cut
is securely fixed on the work arbor and the machine being started,
the cutter reciprocating vertically on its center line is fed
towards the blank, and cuts its way to the proper depth; at this
point both cutter and blank begin to revolve, the cutter
maintaining its reciprocating motion; this revolution of the cutter
and blank is obtained by external mechanism, which insures that the
movement SHAPING MACHINES. shall be as though the cutter and blank
were two complete gears in correct mesh; fig. 161 shows a section
through the centers of blank and cutter which will explain the
process of cutting an external-toothed gear wheel; internal gears
can be cut with equal ease and regularity. Fig. 161 shows the
action of the gear cutter, also each cut and the wedge form of the
gear shaper chips. The combined result of rotary and reciprocatory
motions is that the cutter teeth generate conjugate teeth in the
blanks which mesh correctly with the cutter teeth and with each
other. Fig. 162 illustrates a device for setting planing or shaper
tools; it consists of a body containing a spirit level, the bubble
of which appears through an elongated opening DEVICE FOR SETTING
TOOLS. formed in the top plate, attached to the body and provided
at its side with linear graduations having their zero points
coinciding with the zero point of the bubble. The body is provided
with a downwardly extending web terminating in...
|Country of origin:
||246 x 189 x 3mm (L x W x T)
||Paperback - Trade
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