They may be filed into shape and
afterward tempered. They are slotted and held to their places on the
head by means of quarter-inch machine screws. It is not absolutely
necessary to use two knives, but when only one is employed a
counterbalance should be fastened to the head in place of the other.
All kinds of moulding, beading, tonguing, and grooving may be done
with this attachment, the gauge being used to guide the edge of the
stuff. If the boards are too thin to support themselves against the
action of the knives they must be backed up by a thick strip of wood
planed true. The speed for this cutter head should be as great as
possible.
Fig. 5 shows an attachment to be used in connection with the cutter
head and saw table for cutting straight, spiral, or irregular flutes
on turned work. It consists of a bar, D, carrying a central fixed arm,
and at either end an adjustable arm, the purpose of the latter being
to adapt the device to work of different lengths. The arm projecting
from the center of the bar, D, supports an arbor having at one end a
socket for receiving the twisted iron bar, E, and at the other end a
center and a short finger or pin. A metal disk having three spurs, a
central aperture, and a series of holes equally distant from the
center and from each other, is attached by its spurs to the end of the
cylinder to be fluted, and the center of the arbor in the arm, D,
enters the central hole in the disk while its finger enters one of the
other holes.
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