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Set
The term “set” refers to the way in which the
saw teeth are bent or positioned. Bending the
teeth creates a kerf that is wider than the back
of the blade.
Set patterns are usually selected depending
upon the type of material that needs to be cut.
Three common set patterns are shown in Figure
37.
Generally, the Raker set is used for cutting
metal workpieces; the Wave set, when the
thickness of the workpiece changes, such as
cutting hollow tubing or structurals. The Straight
set is most often preferred when cutting wood or
plastics.
Material
Band saw blades can be made from different
types of materials. Some of the most common
include spring steel, carbon steel, bimetal
(carbon steel equipped with a high speed cobalt
steel edge welded to it), or carbide tips.
Because of the importance of blade selection, it
is recommended that you use the blade
selection guide on page 28.
Blade Breakage
Band saw blades are subject to high stresses
and breakage may sometimes be unavoidable.
However, many factors can be controlled to help
prevent most blade breakage. Here are some
common causes for breakage:
1. Misalignment of the blade guides.
2. Feeding workpiece too quickly.
3. Using a wide blade to cut a tight radius
curve.
4. Excessive tension.
5. Teeth are dull or improperly set.
6. Upper guides are set too high off the
workpiece.
7. Faulty weld on blade.
Figure 37