Promac SX-823DGB, Manual

Page: 9 / 53

9
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 =12.5 sq.ln. (79cm
2
)
3"(75 mm ) ID = 7.0 sq.ln. (44cm
2
)
Area= 5.5 sq.ln. (35cm
2
)
5.5 sq.ln. (35cm
2
) / 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
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:
15% When cutting
1/4"(6.4mm) material (l0/l4 Vari-Tooth)
12% When cutting
3/4"(19 mm) material (6/10 Vari-Tooth)
10% When cutting 1-
1/4"(32 mm) material(5/8 Vari-Tooth)
5% When cutting 2-
1/2" (64 mm) material(4/6 Vari-Tooth)
Decrease Band Speed:
12% When cutting 8"(200mm)
material(2/3 Vari-Tooth)
MATERIAL
ALLOY ASTM
NO. BAND SPEED
FT./MI
N
M/MIN
Copper
Alloy 173,932 314 96
330,365 284 87
623,624 264 81
230,260,272 244 74
280,264,632,655 244 74
101,102,110,122,172
234 71
1751,182,220,510 234 71
625,706,715,934 234 71
630 229 70
811 214 65
Carbon
Steel 1117 339 103
1137 289 88
1141,1144 279 85
1141 HI STRESS 279 85
1030 329 100
Carbon
Steel
1008,1015,1020,1025
319 97
1035 309 94