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Full text of "Modern Mechanical Engineering Vol-I"

EXAMPLES  OF  WORK

Kg- 59-—A Segmental Pattern for building up a Toothed King

flanges, for use on revolving cranes, turntables, and swing bridges,
are  by Messrs.  Ernest                  .. ..

M.   Brown   &   Co.   of
Huddersfield.

4. MACHINE-MADE
WHEELS

The economies of
this kind of work are
associated chiefly with
the larger gears, and for
those casual orders when
only two or three cast-
ings are required, for
which the cost of com-
plete patterns would be
prohibitive.

The employment of
a few teeth from which
to mould an entire wheel
rim, and of a core box
to include the arms, had
been practised long be-
fore the wheel-moulding
machines were invented.
Teeth attached to a seg-
ment are worked round,
and rammed in succes-
sive stages, at the end of
a radius bar centred on a
pin (fig. 60). Another

These

Fig. 60.-—Segmental Block moulding a Spur Wheel