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Full text of "Modern Mechanical Engineering Vol-I"

ESSENTIAL MACHINES  AND  APPLIANCES

163

Mention has been made on a previous page of the loss of time involved
in the preparation of a dummy box of sand, on which the parting joint is

Fig. 66.—Valve Body Patterns of Wood mounted on Wooden Plate.   The plate, cleated at the ends, has
open joints and strips of hoop iron to secure box pins.

made in moulding by turning over.    This wasteful method is avoided in
all machine moulding, as it is also in all odd-side work, and in the plating of

______________/5\______________

\£/
Fig. 67.—Cock Body Patterns of Metal with Ingate and Runners mounted on Iron Plate
patterns, an immense amount of which is done without any assistance from
machines. As these are more widely utilized the value of the odd-side lessens,
while that of plating grows. Its basis is the plain bottom or joint board