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11.4. Running-in New Saw Blades
The running-in refers to new saw blades. The sharp cutting edges with extremely small edge radii enable high cutting power. In order
that the maximum tool life may be achieved, it is necessary to run in the saw blade to the optimum. Depending on the correct cutting
speed and the workpiece feed and the quality of its material, the saw blade must be run in only with 50% of currently used feed. In this
way the breaking of extremely sharp edges particularly in big workpiece sections will be prevented. These micro-fragments cause
destruction of further teeth. Should vibrations or sounds due to oscillations manifest themselves when a new saw blade has been
fitted, reduce the cutting speed slightly. In small workpiece sections it is recommended to run in the saw blade with a reduced power
for 15 minutes, in big sections for 30 minutes. Then increase the feed slowly to the optimum value.
Correctly run-in cutting edge
11.5. Factors Influencing Saw Blade Life
inappropriate saw blade tooth size • inappropriate saw blade speed and saw blade lowering speed in the cutting position • the saw
blade (the whole band saw head) bears against the workpiece when the band saw is not in the cutting position • the workpiece is not
clamped as recommended • the saw blade tension is not correct (mostly too little tension) • the saw blade is not correctly fitted on the
guide wheels (the saw blade touches the wheel shoulder) • the saw blade guide heads are not correctly adjusted • the distance
between the saw blade guide heads and the workpiece is too big • the oil content of the coolant is too low • the saw blade is not
correctly run in • saw blade maintenance is bad, the metal chips have not been removed from the band saw.
The a.-m. faults cause inaccurate cut, reducing the saw blade life and/or causing even its damage.
11.6. Values Recommended for Cutting
The selection of values depends on the material class and the material section. The table data serve only as a guide; they have to be
adjusted to the material for certain ranges. The numbers of the CSN-Standards serve for information only. They define only the guide
for the material properties for which the respective saw blade type is designed.
ČSN
11 107 - 11 110
11 301 - 11 420 / 12 010 - 12 020
11 500 - 11 600 / 12 020 - 12 060
13 250 / 14 260 / 15 260
14 100 / 15 220
14 220 / 15 124
17 020 - 17 042
17 115
17 253 - 17 255
19 063 - 19 083 / 15 142 / 16 142
19 150 / 19 192 - 19 312
19 422 / 19 452 / 19 721 / 19 740
19 436
19 662
19 721
19 802 - 19 860
INCONEL, HASELLOY, NIMONIC, INCOLOY
Heat treated steel
1000 - 1500 N/mm
Cast steel
Grey cast iron
Copper, bronze, tin bronze
Red bronze
Aluminium bronze
Aluminium alloy castings
99% aluminium, thermoplastics, plastics
Material
In general
Free-cutting steel
Structural steel
Carburizing steel
Spring steel
Bearing steel
Alloy steel
NIRO steel
Valve steel
Heat-resisting steel
Quenched and tempered steel
Unalloyed tool steel
Special alloy steel
Hammer steel
Nitriding steel
Tool steel
High-speed steel
Observe the saw blade
running-in at all times
Micro-chips in high starting feed
Recommended saw blade
speed, m/min for
o 0-100 mm
o 100-290 mm
70-90
70-90
60-90
60-80
60-90
50-70
50-70
40-60
50-70
30-60
50-80
40-70
40-50
30-40
40-60
30-50
30-40
30
60-90
40-70
50-70
30-60
40-50
30-50
30-40
30-40
40-50
30-40
30-40
30
40-60
30-50
30
30
30
30
30-70
30-60
40-80
30-70
70-90
60-90
70-90
60-90
40-70
30-60
80-90
80-90
50-90
50-80
Band saw head descent
speed, m/min
o 0-100 mm
o 100-290 mm
190-60
55-20
190-60
55-30
125-38
35-25
125-30
28-15
125-30
28-15
125-35
30-20
75-15
12-4
90-23
21-10
40-7
6-1
125-35
30-25
120-25
20-8
100-20
18-2
62-15
14-5
76-25
23-12
70-1
16-6
90-23
21-10
25-5
4-2
25-5
4-2
190-60
55-25
190-60
55-30
300-90
85-55
230-75
70-45
230-75
70-45
450-150
140-55
450-150
140-55
Cooling,
oil content
(%)
10-15
10-15
10-15
5-10
3
10
10-15
3
15
5-10
5-10
5-10
No cooling
5
5
3
15-20
15-20
40
No cooling
3
10
10-15
25
No cooling
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