2 - Fagor Automation

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:
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
d Mechanical efficiency (varies from 0.7 to 0.85)
S d
D
Cutting efficiency. Cutting volume per kilowatt every minute
(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 GL and P GLC may be calculated as follows:
F. H5/6
Gravitational load. Required power.
f
M· 2·n ·D²·f
Pd =
=
60·100·1000·d 4·1000·Sd ·d Motor
Drum
Speed
D
V Linear speed in m / min Mechanical efficiency
mL Table mass in kg mC Counterweight mass in kg
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. H5/7.
f
Motor
(kW)
Drum
Selection criteria
Speed
Balance
weight
Load
Load
mL ·V
PGL = (kW)
6120·
(mL-mc )·V
P =
GLC 6120·
(kW)
SELECTING CRITERIA
Asynchronous spindle motor and servo drive selection 5.
DDS
HARDWARE
Ref.1307
213