BANDSAW OPERATIONS - OD1646 - LESSON 1/TASK 1
selected. The blade should be as wide as possible for straight-line sawing.
Then the desired speed is set on the bandsaw machine.
The workpiece is
positioned at the desired angle in one of the bandsaw machine attachments.
Then the cable is connected to the power feed mechanism (if the power feed
is to be used).
The bandsaw machine is then started.
The workpiece is
lightly fed into the blade to start the cut. Once the cut has been started,
the feed can be increased. If the feed is being done by hand, the pressure
applied to the workpiece by the operator can be varied to find the best
cutting conditions.
Straight-line sawing is performed on the bandsaw machine by using one or a
combination of several mechanisms or attachments: the miter guide
attachment, with or without a power feed; the screw feed device, with or
without the work holding jaw device; and the work holding jaw device with
power feed and the angular blade guide attachment.
(a) The Miter Guide Attachment.
The miter guide attachment on some
machines can be connected to the power feed mechanism. On other machines,
feeding must be done by hand when using the miter guide. The workpiece is
clamped or hand-held against the miter guide attachment, and the workpiece
and attachment are moved against the bandsaw blade.
The miter guide
assembly moves on a track parallel to the blade, thereby assuring a
straight-line cut.
(b) The Screw Feed Device. The screw feed device is used to push the
workpiece against the bandsaw blade in a direction parallel to the blade.
The feed screw may be applied directly to the workpiece, or may be used to
push the work holding jaw device in which the workpiece can be positioned at
various angles.
(c) The Work Holding Jaw Device. The work holding jaw device (figure 17
on the following page) can be connected, on some machines, to the power feed
to produce straight-line cuts.
(d) The Angular Blade Guide Attachment.
The angular blade guide
attachment is used for straight-line sawing when the workpiece cannot be cut
in the normal manner because it is too large or too long to clear the column
of the bandsaw machine frame.
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