Fagor DDS Series Hardware Manual page 208

  Selection criteria
5.
224
DDS
HARDWARE
Ref.1912
· 208 ·
In the case of a drill, the bit is mounted on the spindle itself and turns with this
to drill the material. See figure F. H5/5
The power required in this case Pd may be calculated with the following
formula:
D
f
M· 2·n
P =
d
60·100·1000·
F. H5/5
Drilling. Required power.
M
Drilling load torque in N·cm
n
Spindle turning speed in rpm
D
Hole diameter in mm
f
Feedrate in mm/min

Mechanical efficiency (varies from 0.7 to 0.85)
d
Cutting efficiency. Cutting volume per kilowatt every minute
S d
(cm³/kW)/min
In the event of governing a gravitational load, the power required depends
very much on the presence on absence of balance weights (crane or
elevator). See figure F. H5/6
The power required in this case, P
M o t o r
D r u m
S pe e d
L o a d
m ·V
L
(kW)
=
P
GL
6120·
F. H5/6
Gravitational load. Required power.
V
Linear speed in m / min
m
Table mass in kg
L
Governing a frictional load, this is the case of horizontal movements such as
a conveyor belt or a movable table, the required power depends on the
friction coefficient µ. See figure F.
.
D
f
·D²·f
=
4·1000·S ·
d d d
.
& P may be calculated as follows:
GL GLC
M o t o r
B a l a n c e
w e i g h t
(m
L
=
P
GLC
6120·

Mechanical efficiency
m
Counterweight mass in kg
C
H5/7.
(kW)
D r u m
S p e e d
L o ad
-m )·V
c
(kW)