HARVEY Axminster Trade AT220TSM, Руководство пользователя, Страница: 31 / 48

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Cutting Speed
The linear cutting speed should be selected from 40 m/s to 70 m/s to minimize the risk of
kickback. Cutting speed is related to the wood properties, shapes and worker’s habits. The user
can calculate the approximate cutting speed based on the following formula:
In this formula ： V — Cutting speed (m/s)
b — Cutting height of wood (mm)
e
1
— Cutting thickness of wood (mm)
V
H
— Feeding speed (m/s)
P — Power (kw)
K — Unit cutting resistance (N/mm
2
)
Usually, the value K depends on the direction of the wood fiber, the type of wood, the shape of
the cutter and so on. The K value can be written as the following formula:
Kc
—
The basic cutting coefficient related to the cutting type;
Cutting Type
Cutting Angle
45
°
50
°
60
°
70
°
80
°
90
°
End Grain Cutting 1.75 2.1 2.5 3.5 4.4 5.3
Rip Cutting 0.5 0.7 1.0 1.4 1.85 3.0
Cross Cutting 0.3 0.31 0.33 0.35 0.45 0.6
Kg
—
Resistance coefficient of different tree species;
Tree Species Kg Tree species Kg
Pine Tree 1 Birch 1.25
Spruce 1 Oak 1.7
Dahurian Larch 1.1 Beech 1.5
Poplar 0.85 Bass 0.8
0thers 1
Ko
—
Consider the coefficient of the sharpness of the cutter;
K
B —
Coefficient taking into account wood humidity;
Wood state Humidity K
B
Wood State Humidity K
B
Very dry 5-8% 1.1 Newly Milled 50-70% 0.89
Dry 10-15% 1.0 Transported in Water
＞
70% 0.87
Air dry 20-30% 0.93
Working Hour 0 1 1.5 2 3 4 5 6
Ko 1 1.2 1.25 1.3 1.4 1.5 1.6 1.7
P
v e b K
V
H
⋅ ⋅ ⋅
=
1
B o g c
K K K K K
⋅ ⋅ ⋅ =