South Bend Tools SB1123, Руководство пользователя

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-40-
For Machines Mfd. Since 7/21
South Bend Tools
Model SB1123
O P E R A T I O N
Bi-metal Blade: A strip of high-speed tool steel is
precision welded to a flexible carbon blade, then
teeth are ground into the blade to provide good
edge-holding qualities for blades taking a lot of
abuse (see Figure 58).
Carbon Steel Blade
Weld
High-Speed Steel
Figure 58. Bi-metal blade composition. Bi-metal blade composition.
Tooth Set
Two common tooth sets for wood bandsaw blades
are alternate and raker. Each different type of
tooth set removes material in a different manner,
leaving cuts with different characteristics (see
Figure 56).
Alternate Raker
Figure 56. Common woodcutting bandsaw blade tooth Common woodcutting bandsaw blade tooth
sets. sets.
• Alternate: An all-purpose arrangement
where the teeth are bent evenly left and
right of the blade.
• Raker: Three teeth in a recurring group—one
bent left, one bent right, and then one that
is not bent. The raker set is ideal for most
contour cuts.
Tooth Pitch
Measured as TPI (teeth per inch), tooth pitch
determines the number of teeth. More teeth per
inch (fine pitch) will cut slower, but smoother;
while fewer teeth per inch (coarse pitch) will cut
rougher, but faster. As a general rule, choose
blades that will have at least two teeth in the
material at all times. Use fine-pitched blades on
harder woods and coarse-pitched blades on softer
woods.
Carbon Steel
Carbide Impregnated Steel
Figure 57. Carbide-tooth blade composition. Carbide-tooth blade composition.
Blade Material
Bandsaw blades must meet two requirements:
flexibility and hardness. The flexibility of a blade
allows it to travel on the wheel as a band, while
hardness allows the teeth to cut and hold an
edge. Modern material technology has allowed
bandsaw blades to meet these requirements in
various ways.
Carbon Steel:
These blades are differentially
heat treated to provide hard teeth that will hold
an edge, and yet be flexible in the back.
Carbide Tooth:
Extremely hard carbide is either
welded onto or impregnated into the carbon
steel blades, providing superior edge-holding
characteristics (see Figure 57).