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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