BANDSAW OPERATIONS - OD1646 - LESSON 1/TASK 1
TABLE 4. BANDSAWING SPEEDS
(CONTINUED).
All metal cutting bandsaw machines have several cutting speeds which can be
selected.
Since the diameter of the drive wheel of the bandsaw machine
establishes a fixed ratio between the motor or transmission speed in
revolutions per minute to the blade speed in feet per minute, it is not
necessary to convert revolutions per minute into feet per minute as with
most other machine tool operations. The speeds are identified in feet per
minute on the bandsaw machine speed selector controls. Some machines have a
speed indicator with which a careful check of sawing speeds may be made when
the machine is operating with or without a load.
(8) Bandsaw Feeds.
The feed of a vertical bandsaw machine is the
pressure applied to the bandsaw blade by the material being cut.
With
vertical bandsaw machines, the feed is applied to the workpiece instead of
the saw blade. The workpiece may be hand fed or power fed, depending upon
the operation to be performed. Cutting curves or special contours requires
that the workpiece be fed into the bandsaw blade by hand.
(a) Power Feeding. The power feed on a bandsaw machine is operated by
adjustable weights in the machine pedestal.
The weights are connected by
cables to one of the work holding attachments of the sawing machine to pull
the workpiece against the bandsaw blade.
To operate the power feed, the
weights are raised by depressing a pedal and the cables are then fixed to
the work holding attachment. When the pedal is released, the weights pull
the piece into the blade.
(b) General Rules for Feeding Workpieces.
A number of general rules
apply to feeding workpieces on bandsaw machines. The feed should be light
when starting a cut. The pressure can be increased
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