8 in. When the arm is in its
highest position there is room for a piece of work 4 ft. high between
the circular table and the lower end of the spindle. The circular
table serves as a compound table for ordinary work, and the machine is
altogether a very useful one for boiler-makers.
The plate-bending rolls, which are illustrated on first page, are 10 ft.
long, and are made of wrought iron, the top roll being 12 in. and the
two bottom rolls 10 in. in diameter. Each of the bottom rolls carries
at its end a large spur-wheel, these spur-wheels, which are on opposite
sides of the machine, each gearing into a pinion on a shaft which runs
from end to end below the rolls, and which is itself geared to the shaft
carrying the belt pulleys, as shown. This is a very simple and direct
mode of driving, and avoids the necessity for small wheels on the rolls.
There is no swing frame, but the top roll is arranged to draw through
between the arms of the spur-wheels, a very substantially framed machine
being thus obtained.
[Illustration: IMPROVED BOILER PLATE BENDING ROLLER.]
The chief novelty in the machine is the additional roll provided
under the ordinary bottom rolls.
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