BANDSAW OPERATIONS - OD1646 - LESSON 1/TASK 1
(9) Annealing the Welded Band. Directly above the grinding wheel is the
When the band is heated up in the welding and
grinding process, the steel at the point of the weld air-hardens and is
brittle. Therefore, it is necessary to anneal the weld by reheating it and
allowing it to cool slowly.
This returns the band to an approximation of
its original temper. Use these steps to anneal the weld:
(a) Clean the welder jaws.
(b) Press the spring clip behind the weld lever, and move the lever up
all the way.
(c) Clamp the band just back of the teeth.
(d) Set the ANNEAL HEAT selector switch (refer to figure 24 on page 32)
at either the 1/16 inch to 1/2 inch or the 5/8 inch to 3/4 inch position,
according to the width of the blade being annealed.
(e) The next step in the annealing process depends on the type of blade
being annealed. It is very important that this step be performed carefully:
1 Carbon Blades. If a carbon blade is being annealed, press and jog
the anneal switch pushbutton until the weld is a dull cherry to cherry red
Then allow the blade to cool slowly by decreasing the jogging
2 Dart Blades.
For a Dart blade, heat the blade slowly until the weld
becomes a deep blue
color. Continue to heat by jogging the anneal switch
pushbutton until the
width of the blue color is one-half the length of the
band exposed between
the jaws. Do not overheat or the temper of the band
adjacent to the weld
will be damaged. Cool quickly by releasing the button.
bandsaw machine using a band file and the band file attachment.
sawing operations, the quality of filing and the economical wear of the band
file depend upon proper selection of files and filing speeds for different
materials and conditions.