10. CONNECTION OF THE MOTOR CORD
CAUTION
• Before connecting to the Motor Cord Connector, make sure the Main Power Switch in the
CONTROLLER is turned OFF. If the Main Power Switch on the CONTROLLER is ON while
connecting the Motor Cord Connector, damage may cause to the CONTROLLER.
• Install the Connector Cap (Protective Cap etc.) to prevent damage or contamination to the Motor
Cord Connector when not in use.
①
Remove the Protective Cap of the Motor Cord.
Protective Cap
Protective Cap
Motor Power
Line
Motor Signal
Line
Take out
Take out
Fig. 9
②
Ensure the Alignment Pin (Motor Spindle Side) and Alignment Hole (Motor Cord Side) are located (12 o-clock)
upward. Carefully insert the alignment pin into the alignment hole and push straight into the Connector of the
Motor Cord.
Motor Spindle Side
Motor Cord Side
Alignment Pin
Alignment Hole
Alignment Hole
Alignment Pin
Fig. 10
③
Tighten the Connector Nut with clockwise.
④
Insert the air hose of the Motor Cord Side
to the air joint of the Motor Spindle Side.
11. INSTALLATION OF THE MOTOR SPINDLE
WARNING
When installing a electric motor spindle to a fixed base, make sure the fixed base is grounded in
order to avoid the risk of an electric shock.
CAUTION
• When installing a motor spindle, do not hit, drop or cause shock to the motor spindle. This may
cause damage to internal components and result in malfunctions.
• When mounting the motor spindle, be sure to mount within clamping area etched on the motor
spindle. If the motor spindle is installed incorrectly, this will cause and damage to the motor spindle.
• Cautions when tightening the securing bolt of the Split Type Holder
Do not over tighten the bolt. This may cause damage to motor spindle's precision.
Tighten the bolt until the motor spindle body can not be turned by hand within the fixture.
Extreme tightening is not necessary or recommended.
Apply working force and check that the motor spindle is tight before using.
①
When mounting a motor spindle, refer to the Clamping Area etched on the motor spindle. (Fig. 13)
CLAMPING AREA
(40)
(80)
（
Clamping Area
）
Fig. 13
* When installing a motor spindle, use a "Grip Ring
GR-50 (sold separately (Fig. 14))" recommended.
If the Grip Ring GR-50 (sold separately) cannot
be used due to the restriction of dimension and
space, install as shown in
②
below.
②
When installing a motor spindle to the holder, recommended installation method is shown in Fig. 15. Refer to "
③
How
to fabricate the Split Type Holder". If this is not possible, install as shown in Fig. 16.
Fastening Bolt
Fastening Bolt
Fastening Bolt
Slit of Bushing
Split Type Holder
Bushing with Slit
Slit
Spacer
Fig. 15
Fig. 16
Fig. 17
CAUTION
Do not allow set screws to come directly
in contact with the motor spindle body
as shown in Fig. 17, as this will result in
damage to the motor spindle housing
and internal components.
When installing, never clamp directly
over the bearings, as this will result in
bearing damage. (Refer to Fig. 18)
③
How to fabricate the Split Type Holder
（
1
）
Roughly process (carve) the inside
diameter of the Split Type Holder.
（
2
）
Cut a slit. (Ex. Slit 2 mm)
（
3
）
Twist the Screw for Removal and
Broaden the Slit Area.
（
4
）
Insert spacer (ex t = 2 mm) into the
Slit Area.
（
5
）
Loosen the Screw for Removal, and
tighten the fastening bolt with the
specified torque.
（
6
）
Finish the Split Type Holder so that
the inside diameter of the Split Type
Holder is
φ
50 with its tolerance range
from - 0.015 mm to - 0.025 mm, and
its roundness and cylindricity of less
than 5 µm.
（
7
）
When inserting the motor spindle
loosen the Fastening Bolt and twist
the Screw for Removal, and broaden
the Slit Area.
CAUTION
•
How to confirm the tightening standard of the holder by the clamp meter
Measure the current value of the CONTROLLER's power cord by the clamp meter.
Fasten the holder so that the increase in the no-load current value (during rotation at the
maximum rotation speed) with the motor spindle fastened is 50 mA (for type 200 V - 240 V) or
less, compared to the no-load current value (during rotation at the maximum rotation speed)
without fastening the motor spindle. Do not overtighten the Fastening Bolt. It may damage motor
spindle's precision and shorten the life of the bearings.
•
The final responsibility for ensuring holder
ʼ
s safety for use in a given application is left to the
designer of the equipment in which NAKANISHI's motor spindle is installed.
NAKANISHI offers motor spindles with a wide variety of capabilities and specifications.
Please carefully check the motor spindle's specifications against the requirements of your
equipment and verify suitability and safety of the Holder prior to initial use.
Motor Cord Side
Motor Spindle Side
Tighten
Connector Nut
Fig. 11
Insert
Fig. 12
Grip Ring GR-50 (Sold separately)
CLAMPING AREA
Fig. 14
Bearing
Fastening Bolt
Fastening Bolt
Deformation
Damage of Internal
Components
Fig. 18
Fastenig Bolt
Fastening Bolt
Spacer
Slit
Front View
Side View
Screw for Removal
Screw for Removal
Fastening Bolt
Spacer
Spacer
Fig. 19
12. BREAK-IN PROCEDURE
During transportation, storage or installation the grease inside the bearings will settle. If the spindle is suddenly run
at high-speed excessive heat will cause bearing damage. After installation, repair, initial operation, or long periods of
non operation please follow the break-in procedure detailed in Table. 3.
Table. 3
Steps
1
2
3
4
Rotation speed
（
min
-
1
）
2,500
5,000
7,500
10,000
Rotation Time (min)
15
10
10
15
Items to Check
No Abnormal Noises The motor spindle housing temperature
during the break-in process should not
exceed 20 degrees C (36 degrees F) above
ambient temperature. Should the motor
spindle exceed this limit, rest the motor
spindle for at least 20 minutes and re-start
the break in procedure from the beginning.
If the housing temperature rises again and
exceeds 20 degrees C (36 degrees F)
above ambient temperature, check the
motor spindle for proper installation.
The motor spindle
housing temperature
during the break-in
process should not
exceed 20 degrees C
(36 degrees F) above
ambient temperature.
13. CAUTIONS WHEN USING CUTTING TOOLS
CAUTION
Refer to the following formula for the maximum spindle rotation speed when using a drill or an
end mill.
Rotation speed (min
-1
) =
1,000 x Cutting speed (m/min)
3.14 x Cutting drill diameter (mm)
①
The spindle RPM depends on the tool diameter and the workpiece material.
②
Please follow the manufacturer's recommended rotational speed. Applying tools outside of manufacturer's
maximum recommended rotational speed may cause damage to the spindle or injury to the operator.
③
For improved machining accuracy, Keep the overhang length to a minimum when installing the tool.
④
When increasing the cutting tool overhang, reduce the motor speed. (Table. 4, Table. 5)
⑤
Keep the cutting tool shank and collet clean. Any contaminants in the collet or collet nut will cause excessive
runout and will therefore cause damage to the cutting tool and or spindle.
⑥
Do not strike or drop the spindle.
Table. 4 Relationship Between Drill Overhang Length and RPM
Overhang Length (mm)
Max RPM
Drill diameter
×
10
100 % of the RPM
Drill diameter
×
20
70 % of the RPM
Drill diameter
×
20 or more
50 % or less of the RPM
Table. 5 Relationship Between End Mill Overhang Length and RPM
Overhang Length (mm)
Max RPM
Shank diameter x 5
100 % of the RPM
Shank diameter x 10
50 % of the RPM
Shank diameter x 10 or more
30 % or less of the RPM
14. CAUTIONS IN USING GRINDSTONES
CAUTION
The maximum surface speed or rpm is always specified for a grindstone. Do not exceed the
maximum speed with reference to the calculating chart below. Always follow the grindstone
manufacturers recommendations.
Surface Speed (m/s) =
3.14 x Diameter (mm) x rotation speed (min
-1
)
1,000 x 60
①
The proper surface speed for general grindstones is 10 - 30 m/s.
②
Do not exceed 13mm of overhang for mounted grindstones. (Fig. 21)
③
For improved machining accuracy, Keep the overhang length to a minimum when installing the tool.
④
When increasing the cutting tool overhang, reduce the motor speed. (Table. 6)
⑤
Dress the grindstone prior to use.
⑥
Do not use cutting tools with bent or broken shanks, cracks or excessive run - out.
⑦
For grinding, the maximum depth of cut should not exceed 0.01mm radially or axially. Reciprocate the tool
several times after each pass to eliminate tool pressure.
⑧
Keep the cutting tool shank and collet clean. Any contaminants in the collet or collet nut will cause excessive
runout and will therefore cause damage to the cutting tool and or spindle.
⑨
Do not strike or drop the spindle.
Table. 6 Relationship Between Overhang and RPM
Overhang (mm)
Max RPM (mm
-1
)
20
N x 0.5
25
N x 0.3
50
N x 0.1
※
N=Max. Operating Speed with 13mm overhang.
15. TROUBLESHOOTING
If a problem or concern occurs, please check the following prior to consulting your dealer.
Trouble
Cause
Inspection/Corrective Action
Spindle does not
run.
The ball bearings are damaged.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
Motor is broken.
Replace the motor.
(Return to NAKANISHI dealer service.)
Overheating
during rotation.
Cutting debris has contaminated
the ball bearing, and the ball
bearing is damaged.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
Low air pressure.
Check air hose connection and air pressure.
Abnormal
vibration or noise
during rotation.
Using bent tool.
Replace the tool.
Cutting debris has contaminated
the ball bearing.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
The ball bearings are worn.
Tool slippage.
Collet or collet nut are not
correctly installed.
Check and clean the collet and collet nut. And,
tighten the collet accurately again.
The collet and the collet nut are
worn.
Replace the collet and the collet nut.
High run-out.
The tool is bent.
Change the tool.
Collet nut is not correctly installed. Secure the collet and the collet nut correctly.
The collet and the collet nut are
worn.
Replace the collet and the collet nut.
Inside of the spindle is worn.
Replace the spindle shaft.
(Return to NAKANISHI dealer service.)
Contaminants inside the collet
and the collet nut or the spindle.
Clean the collet, collet nut and the inside of the
taper and spindle.
The ball bearings are worn.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
16. DISPOSAL OF THE AIR BEARING
When disposal of an Air Bearing Turbine Spindle is necessary, follow the instructions from your local
government agency for proper disposal of industrial components.
Fig. 20
Overhang Length (mm)
Fig. 21
13
