]
This radial drill, which is a tool of substantial proportions, is
adapted not only for ordinary drilling work, but also for turning the
ends of boiler shells, for cutting out of flue holes tube boring, etc.
As will be seen from our engraving, the pillar which supports the radial
arm is mounted on a massive baseplate, which also carries a circular
table 6 ft. in diameter, this table having a worm-wheel cast on it
as shown. This table is driven by a worm gearing into the wheel just
mentioned. On this table boiler ends up to 8 ft. in diameter can be
turned up, the turning tool being carried by a slide rest, which is
mounted on the main baseplate, as shown, and which is adjustable
vertically and radially.
For cutting out flue holes a steel boring head is employed, this head
having a round end which fits into the center of the table. When this
work is being done the radial arm is brought into the lowest position.
Flue holes 40 in. in diameter can thus be cut out.
The machine has a 4 in. steel spindle with self-acting variable feed
motion through a range of 10 in., and the radial arm is raised or
lowered by power through a range of 2 ft.
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