Shape; Set; Material; Blade Breakage - Jet JWBS-15 Operating Instructions And Parts Manual

General rule: Use a blade that will have no fewer
than 6 and no more than 12 teeth in the workpiece
at any given time.
Figure 9-6

9.9 Shape

Figure 9-7 shows common types of tooth shape.
Tooth shape has an effect on cutting rate, and with
few exceptions, the Skip and Hook types are used
to obtain higher feed rates when cutting thick
workpieces. Variable-tooth
available, which combine features of the other
styles.
Figure 9-7

9.10 Set

The term "set" refers to the way in which the saw
teeth are bent or positioned. Set patterns are usually
selected depending on the type of material that
needs to be cut. Three common set patterns are
shown in Figure 9-8.
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.
blades are also
24
Figure 9-8

9.11 Material

Band saw blades can be made from different types
of materials. Some of the most common include
spring steel, carbon steel, carbon steel equipped
with a high speed or welded edge (bi-metal), or
carbide tips. A special type of saw blade is made
from "high speed steel"; these should not be used
on band saws with low rates of speed.
Because of the importance of blade selection, it is
recommended that you use the Blade Selection
Guide in sect. 11.0.

9.12 Blade breakage

Band saw blades are subject to high stresses and
breakage may sometimes
However, many factors can be controlled to help
prevent most blade breakage. Here are some
common causes for breakage:
1. Misalignment of blade guides
2. Feeding work too fast
3. Using a wide blade to cut a short radius curve
4. Excessive tension
5. Teeth are dull or improperly set
6. Upper guides are set too high off workpiece
7. Faulty weld on blade
be unavoidable.