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As shown in Fig. 15.16, when performing drill processing, the blade is mounted to the main axis and ro-
tated, opening a hole in the material being processed, so the motive force P
using the following formula. The load torque M differs depending on the material, and the ratio of the drill
radius D: Feed speed f, so care must be applied.
M ⋅ 2πn
P
=
D
60 × 100 × 1000 × η
M:
Drill load torque (N
n:
Main axis speed (min
:
Machine efficiency 0.7 to 0.85
η
D
D:
Drill radius (mm)
f:
Feed speed (mm/min.)
S
:
Cutting efficiency (i.e., cutting amount per 1 kW per minute) (CC/kW/min.)
D
D
Fig 15.16
Example of Drill Processing
Gravity Load Drive
J
The motive force required to move a load such as a crane or loader vertically differs greatly depending on
whether or not a counterweight is used. The motive force in each case can be expressed using the following
formulas.
Without counterweight
With counterweight
Vertical travel speed (m/min.)
V:
Machine efficiency
η:
m
:
Load mass (kg)
L
m
:
Counterweight mass (kg)
C
Motor
(a) Without Counterweight
Fig 15.17
Gravity Loads
2
f
πD
=
4 × 1000 × S
D
⋅
cm)
−1
)
f
m
V
L
P
=
(kW)
GL
6120η
(m
)V
− m
L
C
P
=
(kW)
GLC
6120η
Drum
Motor
Speed
V (m/min)
m
L
Load
(kg)
15 -13
15.3 Determining Drive Capacity
required can be expressed
D
(kW)
η
D
D
Speed
V (m/min)
m
L
(kg)
(b) With Counterweight
15
m
C
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