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10 . REPLACING THE COLLET
CAUTION
Collet will be worn and torn if it will be opened and colsed about 5,000 - 10,000 times. Replace it
with the new collet at this time.
① Stop the coolant air of motor.
② Supply air pressure : from 0.55 - 0.6MPa (79.8 - 87psi)
to Air Inlet Joint to keep the collet opened.
Do not take off the tool when the air pressure is supplied.
③ Place the provided wrench 9mm on the wrench hook of
the spindle shaft, and tighten the Spindle.
④ Place the provided wrench 6.1mm on the collet and
turn it counterclockwise to loosen the collet. And take
off the collet with the tool from the spindle shaft.
⑤ Remove the tool from another collet.
⑥ Insert the tool into another collet and turn it clockwise
to be attached on the spindle shaft.
Spindle Shaft
⑦ Tight it lightly with the provided wrench 9mm and
wrench 6.1mm (Speci¿ed tightening torque : 1.0 N・m).
⑧ Exhaust the air through 3-way valve.
⑨ After the chuck is replaced, supply the coolant air of
motor to the motor.
11 . INSTALLATION OF THE SPINDLE
WARNING
When installing a Spindle to a ¿xed base, make sure the ¿xed base is grounded in order to avoid
the risk of an electric shock.
CAUTION
・
When installing a Spindle, do not hit, drop or cause shock to the Spindle. This may cause
damage to internal components and result in malfunctions.
・
When mounting the Spindle, be sure to secure within Clamping Area etched on the Spindle O.D.
If the Spindle is installed incorrectly, damage to the internal components is possible.
・
Cautions when tightening the securing bolts on to a Split Type Holder
Do not over-tighten the bolt. This will cause damage to Spindle's precision.
Tighten the bolt until the Spindle body can not be rotated by hand within the ¿xture.
Extreme tightening is not necessary or recommended.
Apply working force and check that the Spindle is tight before using.
① When mounting a Spindle, refer to the Clamping
15
Area etched on the Spindle (Fig. 5).
② When installing a Spindle to the holder, recommended installation method is shown Fig. 6. Refer to " ③ How to
fabricate the Split Type Holder ". If this is not possible, install as shown in Fig. 7.
Fastening Bolt
Slit of Bushing
Fastening Bolt
Spacer
Slit
Split Type Holder
Bushing with Slit
Fig. 6
Fig. 7
CAUTION
Do not allow set screws to come directly in contact
with the Spindle body as shown in Fig. 8, as this
will result in damage to the Spindle housing and
internal components.
When installing, never clamp directly over the
Fastening Bolt
bearings, as this will result in bearing damage.
(Refer to Fig. 9)
③
How to fabricate the Split Type Holder
( 1 ) Rough bore the inside diameter of the Split Type Holder.
( 2 ) Cut a slit. (Ex. Slit 2 mm) wide.
( 3 ) Tighten the Screw for Removal and Force Open the Slit Area.
( 4 ) Insert a spacer (Ex. thickness = 2 mm) into the Slit Area.
( 5 ) Loosen the Screw for Removal, and tighten the fastening bolt with its speci¿ed torque.
( 6 ) Finish the Split Type Holder so that the inside diameter of the Split Type Holder is
range from - 0 . 01 mm to - 0 . 015 mm, and its roundness and cylindricity of less than 5 μm.
( 7 ) When inserting the Spindle loosen the Fastening Bolt, and tighten the Screw for Removal, widening
the Slit Area.
Tool
Collet
Loosen
Tighten
Fig. 4
CAUTION
・
How to con¿rm the correct tightening or clamping of the Spindles in the holder:
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 Spindle fastened is 10mA (for type 200V / 230V) or less,
compared to the no-load current value (during rotation at the maximum rotation speed)
without fastening the Spindle. Do not over-tighten the Fastening Bolt. It may damage Spindle's
precision and shorten the life of the bearings.
・
The ¿nal responsibility for ensuring holder's safety for use in a given application is left to the
designer of the equipment in which NAKANISHI's spindle is installed.
NAKANISHI offers Spindles with a wide variety of capabilities and speci¿cations.
Please carefully check the Spindle's speci¿cations against the requirements of your
equipment and verify suitability and safety of the Holder prior to initial use.
12 . BREAK - IN PROCEDURE
During transportation, storage or installation, the grease inside the bearings will settle. If the Spindle is suddenly run
55
at high-speed, the grease will be ejected from the bearings, causing excessive heat that will cause bearing damage.
(Clamping Area)
After installation, repair, initial operation, or long periods of non operation, please follow the break-in procedure
detailed in Table. 2.
Table. 2
Steps
CLAMPING AREA
-1
Rotation Speed (min
Rotation Time（min）
Fig. 5
Items to Check
Fastening Bolt
13 . CAUTIONS WHEN USING GRINDSTONES AND TOOLS
CAUTION
The maximum surface speed or rpm is always speci¿ed for a grindstone. Do not exceed the maximum
speed with reference to the calculating chart below. Always follow the grindstone manufacturer's
Fig. 8
recommendations.
Surface Speed ( m / s ) =
Deformation
① The proper surface speed for general grindstones is 10 - 30 m / s .
Damage of internal
② Do not exceed 13mm of overhang for mounted grindstones as shown in Fig. 11. If the overhang must
Components
exceed 13mm, reduce the motor speed in accordance with Table. 3.
③ Dress the grindstone prior to use.
④ Do not use cutting tools with bent or broken shanks, cracks or excessive run-out.
⑤ 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.
⑥ Always operate cutting tools within the allowable recommended speed of the cutting tools. Use of a cutting
tool outside of the allowable speed of the cutting tools could cause damage to the Spindle and injury to the
Bearing
operator.
⑦ Keep the cutting tool shank and collet clean. If contaminants are left in the collet, excessive run-out will cause
damage to the cutting tool and or Spindle.
⑧ Do not strike or disassemble the Spindle.
Fig. 9
⑨ Please set the cutting tools to minimize the overhang amount. 13mm is the maximum amount of overhang to
maintain high accuracy and safety.
40 with its tolerans
Fastening Bolt
Screw for Removal
Screw for Removal
Fastening Bolt
Fastening Bolt
Spacer
Slit
Front View
Side View
Fig. 10
1
2
3
) (rpm)
15,000
30,000
40,000
15
10
10
No Abnormal
The spindle housing temperature during
The spindle housing
Noises
the break-in process should not exceed 20
temperature during
degrees C (36 degrees F) above ambient
the break-in process
temperature. Should the spindle exceed this
should not exceed
limit, rest the spindle for at least 20 minutes
20 degrees C
and re-start the break in procedure from
(36 degrees F)
the beginning. If the housing temperature
above ambient
rises again and exceeds 20 degrees C (36
temperature.
degrees F) above ambient temperature,
check the spindle and motor for proper
installation.
3.14 x Diameter ( mm ) x rotation speed ( min
-1
) (rpm)
1,000 x 60
Table. 3 Overhang and Speed
Overhang (mm)
Max. Speed (min
20
N x 0.5
25
N x 0.3
50
N x 0.1
*N = Max. Operating Speed with 13mm overhang.
14 . TROUBLESHOOTING
If a problem or concern occurs, please check the following prior to consulting your dealer.
Trouble
Cause
Spindle does not rotate
The Spindle ball bearings have been
or rotate smoothly.
damaged.
The motor has been damaged.
Overheating during
Cutting debris has contaminated the
ball bearings, and the ball bearings
rotation.
are damaged.
Abnormal vibration or
The tool shank is bent.
noise during rotation.
Cutting debris has contaminated the
ball bearing.
The Spindle ball bearings have been
damaged.
Tool slippage.
Collet is not correctly installed.
The collet is worn.
High run-out.
The tool is bent.
Collet is not correctly installed.
The collet is worn.
Inside of the Spindle is worn.
Contaminants inside the collet or the
Spindle.
The Spindle ball bearings have been
damaged.
Check can not be
Poor the air hose.
opened and closed.
The air hose have been damaged.
Low air pressure.
Error connection of the air circuit.
Refer to the brushless motor and the E3000 CONTROLLER Operation Manuals.
15 . DISPOSAL OF THE SPINDLE
When disposal of a Spindle is necessary, follow the instructions from your local government agency for proper
disposal of industrial components.
4
50,000
15
Contents are subject to change without notice.
-1
) (rpm)
13
Fig. 11
Inspection/Corrective Action
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
Replace the motor.
(Return to NAKANISHI dealer service.)
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
Replace the tool.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
Check and clean the collet. Reinstall the collet.
Replace the collet.
Change the tool.
Secure the collet correctly.
Replace the collet.
Replace the spindle shaft.
(Return to NAKANISHI dealer service.)
Clean the collet and the inside of the taper and
Spindle.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
Check all threaded joints and re-tighten if
necessary.
Replace the air hose.
Check and adjusting the air circuit.
2015 . 07 . 20 003
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