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7. MAKE PROPER TOOTH SELECTION
For maximum cutting efficiency and lowest cost
per cut, it is important to select the blade with the right
number of teeth per inch (TPI) for the material being
cut. The material size and shape dictate tooth selection.
TOOTH SELECTION
You need to consider:
The width of the cut - That is, the distance in the cut
that each tooth must travel from the point it enters
the work-piece until it leaves the work-piece, and
1. The shape of the work-piece.
Squares, Rectangles, Flats (Symbol : ■)
Locate the width of cut on the chart.
(Inches on the outer circle and millimeters
on the inner circle.) Select the tooth pitch
on the ring marked with the square shape
which aligns with the width of cut.
EXAMPLE: 6" (150mm) square, use a 2/3
Vari-Tooth.
Round Solids (Symbol : ●)
Locate the diameter of your work-piece on
the chart. Select the tooth pitch on the
ring marked with the round shape which
aligns with the size of stock you are cutting.
EXAMPLE: 4" (100mm) round, use a 3/4
Vari-Tooth.
Tubing, Pipe, Structural ( Symbol : O H ^ )
Determine the average width of cut by
dividing the area of the work-piece by the
distance the saw blade must travel to finish
the cut. Locate the average width of cut on
the chart. Select the tooth Ditch on the ring
marked with the tubing and structural
shape, which aligns with the average width
you are cutting.
EXAMPLE: 4"(100mm) outside diameter, 3"(75mm)
inside diameter tubing.
4"(100mm) OD
3"(75 mm ) ID
Area= 5.5 sq.ln. (35cm
2
5.5 sq.ln. (35cm
) / 4" (100mm) distance
=1.38(35mm) average width
1.38" (35mm), use a 4/6 Vari-Tooth
NOTE: The band speed and cutting rate
recommendations presented on this chart are
approximations and are to be used as a starting point
for most applications. For
=12.5 sq.ln. (79cm
= 7.0 sq.ln. (44cm
2
)
exact sawing parameters' consult your saw blade
supplier.
8. BI-METAL SPEEDS AND FEEDS
These figures are a guide to cutting 4"(100mm) material
(with a 314 Vari-Tooth) when using a cutting fluid.
Increase Band Speed:
1/4"(6.4mm) material (l0/l4 Vari-Tooth)
3/4"(19 mm) material (6/10 Vari-Tooth)
1/4"(32 mm) material(5/8 Vari-Tooth)
1/2" (64 mm) material(4/6 Vari-Tooth)
Decrease Band Speed:
material(2/3 Vari-Tooth)
ALLOY ASTM
MATERIAL
NO.
Copper
173,932
Alloy
330,365
623,624
230,260,272
280,264,632,655
2
)
101,102,110,122,172
2
)
1751,182,220,510
625,706,715,934
630
811
Carbon
1117
Steel
1137
1141,1144
1141 HI STRESS
1030
Carbon
1008,1015,1020,1025
Steel
1035
10
15% When cutting
12% When cutting
10% When cutting 1-
5% When cutting 2-
12% When cutting 8"(200mm)
BAND SPEED
FT./MI
M/MIN
N
314
96
284
87
264
81
244
74
244
74
234
71
234
71
234
71
229
70
214
65
339
103
289
88
279
85
279
85
329
100
319
97
309
94
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