Hafco BS-13LS, Instruction Manual

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8
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.
z
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)
BAND SPEED MATERIAL ALLOY
ASTM NO.
FT./MIN M/MIN
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
Copper
Alloy
811 214 65
1117 339 103
1137 289 88
1141,1144 279 85
Carbon
Steel
1141 HI STRESS 279 85
10 Instruction Manual for BS-13LS (B031) 30/03/2016