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PRECAUTIONS FOR USE
q Do not block the heat radiation pore at the time of instration because the temperature inside of the
control unit increases and disturb the cooling function when the fun runs in a high speed.
w When Reset Switch works, it is a sign for overload so that use the motor with the load not Reset
Switch actuates.
e When using the motor with loaded condition continuously, use it less than the maximam torque
0.45cN ・ m ( primary current 0.9A ) .
r ASTRO-E 250 is not a hand tool. Use it installing on a lathe, NC lathe, automatic machine, special
purpose machine, etc.
t Do not hit or drop the motor spindle because it creates the cause of rotating malfunction, heat
generation and the deformation of sheath.
y Clean the collet chuck often because debris and grinding powder sticking in the collet chuck and
spindle may hurt them and creates the cause of run out.
u Tighten the collet chuck firmly not the bur is thrown out while it is running.
i Do not tighten the collet chuck and collet cap without mounting a bur because they may apart and
very dangerous.
o When using cooling and dust protection air, always use clean air because if the dust and water are
penetrated into the motor and spindle they will create the cause of malfunction.
!0 When using cutting lubricant, be sure to supply cooling and dust protection air.
◆ FEATURES OF ASTRO-E 250
q Brushless DC motor eliminates the nuisance of carbon brush replacement.
w Precise digital display accurately indicates motor speed.
e Variable speeds at constant torque of 2,000 to 25,000min
r Sequence control terminal of control unit on NE-72 can be assembled to a machine to make a
automatic machine.
t Alminium ( A6061B ) is used for motor and the outside diameter isφ30A with an air inlet for cooling
and dust protection.
y Torque can be increased with the combination of Speed Reducers.
u Wide selection of collet chucks are available.
i Spindles and Speed Reducers from ASTRO system can be used.
◆ SPECIFICATIONS
Unit
Model
NE-72
Power Source
120V, 230V
Power Consumption
75W
3.2kg ( 7.05Lbs )
Weight
Dimensions ( A )
W225×D195×H97
-1
made possible of precision work.
Motor & Spindle
Model / Motor
EM-250, EM-255
Model / Spindle
NR-302
Speed
2,000〜25,000min
Weight
481g w / Cord
P. 1
ASTRO-E 250 Torque Characteristic Graph
6
5
4
3
2
1
0
◆ NOMENCLATURE
① Control Unit NE-72
② Motor Handpiece
-1
Torque
Output
5
10
15
20
Speed ( x 10
)
3
min
-1
⑤ Power Source Switch
⑥ Power Source LED Lamp
⑫ Manual / Automatic Select Switch
Forward / Reverse Select Switch
⑪
( Circuit Breaker Release Switch )
⑩ Reset Switch ( Red )
⑨ LED Speed Display
⑧ Speed Control Knob
③ Handle
⑦ Motor Output Power Connector
④ Motor Cord Plug
（EM-250・NR-302
EM-255）
Fig. 1
P. 2
120
100
80
60
40
20
0
25
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