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Making proper tooth selection continued....
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 workpiece until it leaves the workpiece,
and the shape of the workpiece.
• Squares, Rectangles, Flats
Locate the width of cut on the chart (previous page). Select the TPI with the square shape which corresponds to the width of cut of your workpiece.
Example: 5" (127mm) square, use a 2/3 Vari-Tooth blade.
• Round Solids
Locate the diameter of your workpiece on the chart (previous page). Select the TPI with the round shape which corresponds to the diameter of
your workpiece.
Example: 4" (100mm) round, use a 3/4 Vari-Tooth blade.
• Tubing, Pipe, Structural
Determine the average width of cut by dividing the area of the workpiece by the distance the saw blade must travel to finish the cut. Locate the
average width of cut on the chart (previous page). Select the TPI with the tubing and structural shape which corresponds with the average width
you are cutting.
Example: 4" (100mm) outside diameter, 3" (75mm) inside diameter tubing.
4" (100mm) OD = 12.5 sq.In. (79 cm
- 3" (75 mm) ID = 7.0 sq.In. (44 cm
Area = 5.5 sq.in. (35 cm
1.38" (35mm), use a 4/6 Vari-Tooth
Bi-metal speeds and feeds
These figures are a guide to cutting 4" material with a 3/4 Vari-Tooth blade when using the coolant system.
Increase blade speed:
15% when cutting 1/4" (6.4mm) material (10/14 Vari-Tooth)
12% when cutting 3/4" (19mm) material (6/10 Vari-Tooth)
10% when cutting 1-1/4" (32 mm) material (5/8 Vari-Tooth)
5% when cutting 2-1/2" (64mm) material (4/6 Vari-Tooth)
Decrease blade speed:
12% when cutting 8" (200mm) material (2/3 Vari-Tooth)
Material
Copper Alloy
280, 264,0 632, 655
101, 102, 110, 122, 172
1751, 182, 220, 510
625, 706, 715, 934
Material
Ni-Cr-Mo
Alloy Steel
MAKING PROPER TOOTH SELECTION &
)
2
)
2
)
2
5.5 sq.in. (35 cm
Blade Speed
Alloy ASTM No.
Ft/min
173, 932
314
330, 365
284
623, 624
264
230, 260, 272
244
244
234
234
234
630
229
811
241
Blade Speed
Alloy ASTM No.
Ft/min
8615, 8620, 8622
239
8640
199
E9310
174
BI-METAL SPEEDS AND FEEDS
) / 4" (100mm) distance = 1.38 (35mm) average width
2
M/min
Material
96
Carbon
87
Steel
81
74
74
71
1008, 1015, 1020, 1025
71
71
70
65
M/min
73
61
53
Blade Speed
Alloy ASTM No.
Ft/min
1117
339
1137
289
1141, 1144
279
1141 Hi-Stress
279
1030
329
319
1035
309
1018, 1021, 1022
299
1026, 1513
299
A36 (Shape), 1040
299
1042, 1541
249
1044, 1045
219
1060
199
1095
184
M/min
103
88
85
85
100
97
94
91
91
82
76
67
61
56
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