Specifications

DS - 8 Design Ver. 0002
In the case of a drill, the bit is mounted on the spindle itself and turns with this to drill the
material as shown in the Illustration. The power required in this case, P
D
, is calculated as
below:
where:
M is the drill load torque in N·cm.
n is the spindle turning speed in r.p.m.
D is the diameter of the hole in mm. n is the spindle speed in r.p.m.
f is the feedrate in mm/min.
ηη
ηη
η
D
is the mechanical efficiency (varies from 0.7 to 0.85).
S
D
is the cutting efficiency, that is, cut volume per kilowatt each minute in cm
3
/kW/min.
In the event of governing a gravitational load, the power required depends very much on the
presence or absence of balance weights. (crane or elevator). The power required in this case,
P
GL
, is calculated in the following way:
where:
V is the linear speed in m/min.
ηη
ηη
η is the mechanical efficiency.
m
L
is the load mass in kg. m
C
is the balance weight mass in kg.
Governing a
frictional load. This is the case of horizontal movements such as a conveyor
belt or a movable table. For a friction coefficient m, the power required in this case, P
F
, is
calculated as follows:
where:
µµ
µµ
µ is the friction coefficient.
m
L
is the load mass in kg.
V is the linear speed in m/min.
ηη
ηη
η is the mechanical efficiency.
P
mV
GL
L
=
*
*6120 η
(kW) P
mmV
GLC
LC
=
−()*
*6120 η
(kW)
P
Mn Df
S
D
DDD
=
*
** * * **
2
60 100 1000 4 1000
2
π
η
π
η
= (kW)
P
mV
F
L
=
µ
η
*
*6120
(kW)