
BAND SAW BLADES
A band saw blade is a delicate piece of steel that is subjected to
tremendous strain. You can obtain long use from a band saw
blade if you give it proper treatment. Be sure you use blades of
the proper thickness, width and temper for the type of material to
be cut.
Always use the widest blade possible. Use the narrow blades
only for sawing small pieces, abrupt curves and for fine, delicate
work. This will save blades and will produce better work. Band
saw blades may be purchased welded, set, sharpened and
ready for use.
File and set the cutting blade whenever you find it requires
pressure to make a cut. If a blade is broken, it can be brazed or
welded. However, if it has become work-hardened, it will soon
break in another place. If you are not equipped to file, set and
braze or weld blades, take them to a saw filer for reconditioning.
Under average conditions, blades should be resharpened after 4
hours of operation.
Many conditions may cause a band saw blade to break. Blade
breakage is in some cases unavoidable. However, operator
error often causes blades to break. The most common causes of
blade breakage are: (1) Faulty alignment and adjustment of the
guides, (2) Forcing or twisting a wide blade around a
short-radius curve, (3) Feeding stock too quickly, (4) Dullness of
the teeth or absence of sufficient set, (5) Excessive tightening of
the blade, (6) Top guide set too high above the work being cut,
(7) Using a blade with a lumpy or improperly finished braze or
weld and, (8) Continuous running of the saw blade when not in
use for cutting.
New blades for the standard band saw should be 77 1/2"
(1968mm) length, 5/8" (16mm) width.
OPERATING THE BAND SAW
Before starting the machine, make sure that all adjustments are
properly made and the guards are in place. Turn the pulley by
hand to make sure that everything is correct BEFORE turning on
the power.
Keep the top guide down close to the work at all times. Do not
force the material against the blade too hard. Light contact with
the blade will permit easier following of the line and prevent
undue friction, heating and work-hardening of the blade at its
back edge.
KEEP THE SAW BLADE SHARP and you will find that very little
forward pressure is required for average cutting. Moving the
stock into the blade at a steady speed will provide an easy
cutting movement.
Avoid twisting the blade by trying to turn sharp corners.
Remember you must saw around corners.
CUTTING CURVES
When cutting curves turn the stock carefully so that the blade
can follow without being twisted. If a curve is so abrupt that it
necessary to repeatedly back up and cut a new kerf, either a
narrow blade or a blade with more set is required. The more set
a blade has, the easier it will allow the stock to be turned.
However, the cut is usually rougher than a blade with a medium
amount of set. In order to change the cut, the operator must be
careful that he does not accidentally draw the blade off the
wheels. In most cases it is easier and safer to turn the stock and
saw with a series of cuts to protect the blade.
HOW TO ORDER
REPLACEMENT PARTS
Even this high quality power tool may need occasional
replacement parts to maintain good working condition over the
years. To order replacement parts, contact or write Northern
Tool & Equipment Co.
Please give the following information:
1. Model No. and Serial No. and specifications on the Model
No./Serial No. plate.
2. The number or numbers as shown in the replacement parts
list supplied with your power tool.
3. A brief description of the trouble with the power tool.