BANDSAW OPERATIONS - OD1646 - LESSON 1/TASK 1
c. Internal Sawing.
Internal sawing is performed in the same way as
contour sawing, except that the bandsaw blade cannot start cutting from the
edge of the workpiece but must start cutting from a drilled hole in the
workpiece (refer to figure 16 on page 21). With the pattern laid out on the
workpiece and with the starting hole drilled, an unwelded bandsaw blade of
the proper length is inserted through the starting hole. Then the two ends
of the blade are brought together at the butt welder of the bandsaw machine.
The blade is then welded into a continuous band. The bandsaw blade is then
installed onto the bandsaw machine. When the sawing operation is completed,
the bandsaw blade is cut so that it can be removed from the workpiece.
d. Cutting and Welding the Band. When installing a bandsaw blade, or
when cutting and rewelding the blade for internal sawing operations, the
blade and the welder must first be properly prepared; then the blade can be
welded. Follow this procedure to cut and weld a bandsaw blade.
NOTE
In the description that follows, the model 2612-1M
bandsaw machine with integral welder is used as an
example.
The procedures for welding a bandsaw blade
are similar for all models.
(1) General.
The butt welder on the model 2612-1M bandsaw machine is
capable of welding 3/4 inch wide by .032 gage carbon or Dart saw bands. The
two clamping jaws of the welder hold the butted band ends together. When
the welding switch lever is pressed, an electric current is induced through
the butted ends of the blade, creating enough heat to soften the metal and
join the ends. Pressing the welding lever (figure 24 on the following page)
also releases a spring which causes the jaws to force the band ends
together. When the movable jaw has moved .065 inches toward the stationary
jaw, the electric current is automatically cut off. The spring force on the
jaws is released when the welding lever is released.
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