Band Saw Cutting - A Practical Guide - KBC BAH-1010AVS Instruction Manual

I
BAND SAW CUTTING
-
A PRACTICAL GUIDE
Section 6
The regular or raker set is most common and consists of a pattern of one tooth to the left. Set
to the right, to the left and one which is straight, or unset. This type of set is generally used
where the material to be cut
is
uniform in size and for contour cutting.
Wavy set has groups of teeth set alternately to right and left, forming a wave-like pattern.
This reduces the stress on each individual tooth, making it suitable for cutting thin material or
a variety of materials where blade changing is impractical. Wavy set is often used where tooth
breakage is a problem. This is shown in Fig. 6.1 as follows:
Right
/ -
WJS
Fig. 6.1 The saw set
Blade Speed and Feed:
Blade speed is generally limited by vibration and the ability to keep the blade sufficiently cool to
avoid dulling the
teeth.^
blade which is running fast and taking a iery light cut will dull quickly
because the tips of the teeth will overheat from the rubbing action. If, however, we force the blade
teeth deeper into the material, the blade will be less sensitive to
heat,
because the teeth are cutting
more and rubbing less.
Blade selection:
There are five types of blade material generally used:
Hard-back carbon
Semi-high speed
High speed
Carbon
Electron-welded blade
In most high speed production cutting either the semi-high speed or the electron-welded band are
used. Electron welded blade is the best blade. But it is also the most expensive. To construct the
electron-welded blade, M-2 tool steel is welded to the blade back. Therefore the blade is capable
of very high surface speed. The semi-high speed blade is used more in structural because it is
capable of taking a great deal more abuse. The hard-back carbon blade's teeth does not have red-
hardness but if the blade is run slowly it can be very economical. We do not recommend carbon
blades because the back of the blade is not sufficiently strong to stand adequate tension and
because it has poor resistance to heat and abrasion. Usually, the coarse hook tooth blade will give
better results, but accurate feed control is a must with a coarse tooth blade.
ack
.
.
i
."
. ,
A
M-Z
Tooth Steel
Fig. 6.2 Electron Welded Blade