Trouble
Cause
Inspection / Corrective Action
Spindle does not
rotate or rotate
smoothly.
The Spindle ball bearings have
been damaged.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
The motor has been damaged.
Replace the motor.
(Return to NAKANISHI dealer service.)
Overheating
during rotation.
Cutting debris has contaminated
the ball bearings, and the ball
bearings are damaged.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
Abnormal
vibration or noise
during rotation.
The tool shank is bent.
Replace the tool.
Cutting debris has contaminated
the ball bearing.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
The Spindle ball bearings have
been damaged.
Tool slippage.
Collet chuck is not correctly
installed.
Check and clean the collet chuck. Reinstall the
collet chuck.
The collet chuck is worn.
Replace the collet chuck.
High run-out.
The tool is bent.
Change the tool.
Collet chuck is not correctly
installed.
Secure the collet chuck correctly.
The collet chuck is worn.
Replace the collet chuck.
Inside of the Spindle is worn.
Replace the Sspindle shaft.
(Return to NAKANISHI dealer service.)
Contaminants inside the collet
chuck or the Spindle.
Clean the collet chuck and the inside of the taper
and Spindle.
The Spindle ball bearings have
been damaged.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
14. 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.
①
When mounting a Spindle, refer to the
Clamping Area etched on the Spindle (Fig. 5).
CLAMPING AREA
(Clamping Area)
41
32.7
* When installing the Spindle, it is recommended
to use a " GR - 30 Grip Ring (sold separately
(Fig. 6)) ". If the GR - 30 Grip Ring cannot be
used due to the restriction of dimension and
space, install as shown in
②
below.
CLAMPING AREA
Grip Ring GR - 30
(Sold Separately)
Fig. 5
Fig. 6
②
When installing a Spindle to the holder, recommended installation method is shown Fig. 7. Refer to "
③
How to
fabricate the Split Type Holder ". If this is not possible, install as shown in Fig. 8.
Slit
Fastening Bolt
Bushing with Slit
Fastening Bolt
Slit of Bushing
Split Type Holder
Spacer
Fastening Bolt
Fig. 7
Fig. 9
Fig. 8
Do not allow set screws to come directly in contact with the Spindle body as shown in Fig. 9, as
this will result in damage to the Spindle housing and internal components.
When installing, never clamp directly over the bearings, as this will result in bearing damage (Refer
to Fig. 10).
CAUTION
Fig. 10
Fastenig Bolt
Deformation
Damage of internal
Components
Bearing
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 2mm) wide.
（
3
）
Tighten the Screw for Removal and Force Open the Slit Area.
（
4
）
Insert a spacer (Ex. thickness = 2mm) 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
ȭ
30 with its tolerance
range from -0.01mm to -0.015mm, and its roundness and cylindricity of less than 5
ȝ
m.
（
7
）
When inserting the Spindle loosen the Fastening Bolt and tighten the Screw for Removal, widenig the Slit Area.
Slit
Spacer
Fastening Bolt
Front View
Side View
Spacer
Fastening Bolt
Screw for Removal
Spacer
Fastening Bolt
Screw for Removal
Fig. 11
11. BREAK-IN PROCEDURE
During transportation, storage or installation, the grease inside the bearings will settle. If the Spindle is suddenly
run at high-speed, the grease will be ejected from the bearings, causing excessive heat that will cause bearing
damage. After installation, repair, initial operation, or long periods of non operation, please follow the break-in
procedure detailed in Table. 2.
Steps
1
2
3
4
Air Pressure (MPa)
For Air Motor
0.1
0.2
0.3
0.4
Air Pressure (psi)
14.5
29
43.5
58
Rotation Speed (min
-1
)(rpm) For Brushless Motor
5,000
10,000
15,000
20,000
Rotation Time (min)
15
10
10
15
Items to Check
No Abnormal
Noises.
The Spindle housing temperature
during the break-in process
should not exceed 20 degrees
C (36 degrees F) above ambient
temperature. Should the Spindle
exceed this limit, rest the 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 Spindle and motor for
proper installation.
The Spindle
housing
temperature during
the break-in
process should not
exceed 20 degrees
C (36 degrees F)
above ambient
temperature.
12. CAUTIONS WHEN USING GRINDSTONES AND TOOLS
①
The proper surface speed for general grindstones is 10-30m/s.
②
Do not exceed 13mm of overhang for mounted grindstones as shown in Fig. 12. If the overhang must 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 operator.
⑦
Keep the cutting tool shank and collet chuck clean. If contaminants are left in the collet chuck or chuck nut,
excessive run-out will cause damage to the cutting tool and or Spindle.
⑧
Do not strike or disassemble the Spindle.
⑨
Please set the cutting tools to minimize the overhang amount. 13mm is the maximum amount of overhang to
maintain high accuracy and safety.
Overhang (mm)
Max. Speed (min
-1
)(rpm)
20
N x 0.5
25
N x 0.3
50
N x 0.1
* N = Max. Operating Speed with 13mm overhang.
Table. 3 Overhang and Speed
13
Fig. 12
13. TROUBLESHOOTING
If a problem or concern occurs, please check the following prior to consulting your dealer.
2015.11.20 002
Table. 2
CAUTION
・
How to con
¿
rm the correct tightening or clamping of the Spindles in the holder : In case of use
a brushless motor.
Measure the current value of the
CONTROLLER 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.
CAUTION
1,000 x 60
3.14 x Diameter (mm) x Rotation Speed (min
-1
)(rpm)
Surface Speed (m/s)
=
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
recommendations.
In case of using a Brushless Motor, refer to Brushless Motor and E3000 CONTROLLER Operation Manuals..
10. INSTALLATION OF THE SPINDLE
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.
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.
Contents are subject to change without notice.
