Nakanishi NRR-2651 User manual

5. CHANGING THE TOOL
OPERATION MANUAL OM-K0430E
NRR-2651
Lever Type Spindle
002
Thank you for purchasing the Lever Type Spindle NRR-2651. This spindle has a simple lever operated collet chuck.
No wrenches are required for tool changing. This spindle is designed for cutting PC boards. The E2550 <Control
Unit>, <Brushless Motor>, and <Air Line Kit (AL-0201)> are required to drive this spindle. Read this Operation
Manual carefully before use. Also read E2550 <Control Unit>, <Brushless Motor>, and <Air Line Kit (AL-0201)>
Operation Manuals.
1. CAUTIONS FOR HANDLING AND OPERATION
■Read these warnings and cautions carefully and only use in the manner intended.
■ These warnings and cautions are intended to avoid potential hazards that could result in personal injury or
damage to the device. These are classified as follows in accordance with the seriousness of the risk.
WARNING
①The spindle is not a hand tool. It is designed to be used on CNC machines or special purpose
machines.
②Do not touch the cutting tool while it is running. It is very dangerous.
③Wear safety glasses, dust mask, and use a protective cover around the spindle whenever the
spindle is rotating.
④Never connect, disconnect or touch the Power Cord Plug and Motor Cord Connector with wet
hands. This may cause an electric shock.
⑤Stop the motor prior to operating the chuck release lever.
⑥Never operate or handle the spindle until you have thoroughly read the owner's manual and
safe operation has been confirmed.
1) To prevent injuries/damages, check the spindle and cutting tool for proper installation,
bofore operating the spindle.
2) Before disconnecting the spindle, always turn the control power off and turn the compressed
air supply to the control unit off. Then it is safe to remove the spindle.
⑦Make sure that lever position is LOCK before rotating with mounting cutting tool.
⑧Do not use bent, broken, chipped, out of round or sub-standard tools as they may cause
shatter or explode. Tool with fractures or a bent shank will cause injury to the operator.
When using a new tool, rotate it in a low speed and increase speed gradually for safety.
⑨Do not exceed the maximum recommended allowable tool speed. For your safety, use speeds
below the maximum allowable speed.
⑩Do not apply excessive force. This may cause tool slippage, tool damage, injury to the operator
or loss of concentricity and precision.
CAUTION
①Do not drop or hit the spindle, as shock can damage to the internal components.
②Do not connect this spindle to the reduction gear. This may cause collet chuck breakage by
overload.
③Be sure to clean the collet chuck, the inside of the spindle before replacing the tool. If ground
particles or metal chips stick to the inside of spindle or the collet chuck, damage to the collet
chuck or spindle can occur due to the loss of precision.
④When cleaning a spindle, stop the motor and remove debris with a soft brush or a cloth. Do not
blow air into the spindle with compressed air as foreign particles or cutting debris may get into
the ball bearing.
⑤Always clean the tool shank before installing the tool in the spindle.
⑥ When sizing the correct collet chuck size to the tool shank diameter, a tolerance of +0 〜-0.01mm
is strongly recommended. A tool shank within the +0 〜
-
0.1mm range is mountable, however,
this may cause poor concentricity and or insufficient tool shank gripping force.
⑦Select suitable products or tools for all applications. Do not exceed the capabilities of the
spindle or tools.
⑧Carefully direct coolant spray to the tool. Do not spray directly on the spindle body.
⑨Stop working immediately when abnormal rotation or unusual vibrations are observed.
Afterwards, please check the content of section 11 "TROUBLESHOOTING".
⑩Always check if the tool, collet chuck are damaged before and after operating.
⑪If the collet chuck show signs of wear or damage, replace it before a malfunction or additional
damage occurs.
⑫After installation, repair, initial operation, or long periods of non operation, please refer to
section 9. "BREAK-IN PROCEDURE" detailed in Table 1. When checking the spindle, no
vibration or unusual sound should be observed during rotation.
⑬Do not disassemble, modify or attempt to repair this spindle. Additional damage will occur
to the internal components. Service must be performed by NSK NAKANISHI or an authorized
service center.
⑭When using the spindle for mass production, please purchase the another spindle as a spare
in case of emergency.
2. FEATURES
①This spindle has a simple lever operated collet chuck. No wrenches are required for tool changing.
②The spindle housing is made from precision ground, hardened, stainless steel (SUS) with an outside diameter
of ȭ25 mm.
③Various sizes of collet chucks are available CHB-2.0mm, 3.0mm, 3.175mm and 4.0mm. Standard collet chuck
is CHB-3.175mm. (For U.S. market CHB-3.175mm.)
Class Degree of Risk
WARNING
A safety hazard could result in bodily injury or damage to the device if the
safety instructions are not properly followed.
CAUTION A hazard that could result in light or moderate bodily injury or damage
to the device if the safety instructions are not followed.
3 - 2 Outside view
CAUTION
Always stop the motor before operating the collet chuck release lever.
①Stop the motor and check that the motor is not rotating
before replacement.
②Turn the Lever counterclockwise to loosen the collet chuck
and to remove the tool.
③Inset the replacement tool into the collet chuck.
Turn the Lever clockwise all the way until it snaps to tighten
the collet chuck.
Fig. 4
ȭ26.8 0
-0.01
7.5
(2.6)
2.4
13.3
78.15.5
ȭ6.9
25.4
ȭ25
ȭ29.8
(35.8)
30
38.8
20
(39.3)
3. SPECIFICATIONS AND DIMENSIONS
3 - 1 Specifications
Model NRR - 2651
Maximun Motor Rotation Speed 50,000min-1
Applicable Motor
※This spindle can not use the reduction gear.
EM25N - 5000 - 4M / 5M / 8M
EM25N - 5000 - J4 / J5 / J8
Milling Capacity *Note 1
(Cutting or Milling PC boards with an end mill)
End Mill Size : Less than ȭ1.0mm
Work : PC board (ex. Glass Epoxy Resin)
Thickness : Less than 1.6mm
f : Less than 5,000mm/min-1
Weight 330g
*The collet chuck is attached to the spindle.
Standard Accessories
・Collet Chuck* ȭ3.175mm (CHB-3.175)・・1pc. ・Wrench (6.1 ×8) ・・1pc.
(For U.S. market ȭ3.175mm (CHB-3.175))
・Wrench (10 ×10) ・・1pc.
・Wrench (22 ×27) ・・1pc.
・Operation Manual ・・1 set.
Note 1: You may need to lower feed rate (mm/min) depending on the shape of tools being used or the thickness
of work. Always check the milling condition before working.
Collet Chuck (CHB- □□ )ȭ2.0mm, ȭ3.0mm, ȭ3.175mm, ȭ4.0mm
<Option>
Fig. 1
4. CONNECTING TO THE MOTOR
RECOMMENDATION
Please set the tools to minimize the overhang amount for
maintaining high accuracy.
Align the threads on the front end of the motor and the rear end of the spindle, and turn the spindle clockwise.
If the drive shaft of the motor does not engage the drive dog on the spindle, the spindle could not be turned.
DO NOT FORCE. Turn the spindle back a few threads, rotate the tool by hand to engage the drive shaft and the
drive dog, and make the final turns with provided 22mm wrench. (Fig. 3)
Transmission Clutch
22
Turn
22
Tighten
Fig. 3
6. REPLACING THE COLLET CHUCK
Fig. 5
①Turn the Lever counterclockwise.
②Place the provided 10mm wrench on the spindle
shaft to be fastened.
③Place the provided 6.1mm wrench on the collet
chuck and turn it counterclockwise to loosen the
collet chuck. And remove the collet chuck from
the spindle shaft together with the tool.
④Remove the tool from the collet chuck.
⑤Insert the replacement collet chuck and turn it
clockwise to tighten.
⑥
Tighten lightly with the provided 10mm and 6.1mm
wrenches.
⑦Turn the Lever to the Lock position.
Tool
Loosen
Tighten
Spindle Shaft
8
6.1
10
10
Collet Chuck
OPEN
LOCK
Transmission Clutch
The connection part
“+” is “concave”
The connection part
“+” is “convex”
OK Not OK Not OK
Transmission Clutch Transmission Clutch
The connection part
“+” is “concave”
The connection part
“-” is “convex”
The connection part
“-” is “concave”
The connection part
“+” is “convex”
Fig. 2
CAUTION
・Make sure your hands and all interlocking parts of the spindle and motor are clean before
connecting the motor to the spindle. This is critical to prevent contaminants from entering the
motor or spindle.
・The new drive clutch is (+) configuration. The (+) drive spindles were designed to be used with (+)
drive motors.

CAUTION
8. INSTALLATION OF THE SPINDLE
WARNING
When installing a spindle to a fixed base, make sure the fixed base is grounded in order to avoid
the risk of an electric shock.
・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 mounting within clamping area etched on the spindle. If
the spindle is installed incorrectly, this will cause and damage to the spindle.
・Cautions when tightening the securing bolt of the Split Type Holder
Do not over tighten the bolt. This may cause damage to spindle's precision.
Tighten the bolt until the 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 spindle is tight before using.
①When mounting a spindle, refer to the Clamping Area
etched on the spindle. (Fig. 7)
Clamping Area
(35.8)
CLAMPING AREA
Fig. 7
②When installing a spindle to the holder, recommended installation method is shown Fig. 8. Refer to " ③How to
fabricate the Split Type Holder ". If this is not possible, install as shown in Fig. 9.
Spacer
Fastening Bolt
Slit
Fastening Bolt Fastening Bolt Buching Split
Bushing with Slit
Split Type Holder
Fig. 8 Fig. 9 Fig. 10
9. 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 1.
Table 1.
Steps 1234
Rotation Speed (min-1) 15,000 30,000 40,000 50,000
Running 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.
11. TROUBLESHOOTING
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.)
Lever posotion is OPEN. Set the lever to LOCK position.
Overheating during
rotation.
Cutting debris has contaminated the
ball bearing, and the ball bearing are
damaged.
Replace the ball bearings.
(Return to NAKANISHI dealer service.)
The lever is not set to LOCK position. Replace parts.
(Return to NAKANISHI dealer service.)
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 chuck is not correctly installed.
Check and clean the collet chuck. And,
tighten the collet chuck accurately
again.
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 spindle shaft.
(Return to NAKANISHI dealer service.)
Contaminants inside the collet chuck
or the spindle.
Clean the collet chuck and the inside of
the spindle.
The ball bearings are worn. Replace the ball bearings.
(Return to NAKANISHI dealer service.)
If a problem or concern occurs, please check the following prior to consulting your dealer.
CAUTION
Do not allow set screws to come directly in contact with the spindle body as shown in Fig. 10, 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. 11)
Deformation
Damage of Internal
Components
Fastening Bolt
Bearing
Fig. 11
(1) Roughly process (carve) the inside diameter of
the Split Type Holder.
(2) Cut a slit. (Ex. Slit 2mm)
(3) Twist the Screw for Removal and Broaden the
Slit Area.
(4) Insert spacer (ex t = 2mm) 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 isȭ 25 with its
tolerance range from
-
0.01 to
-
0.015mm, and
its roundness and cylindricity of less than 5μm.
(7) When inserting the spindle loosen the
Fastening Bolt and twist the Screw for
Removal, and broaden the Slit Area.
③How to fabricate the Split Type Holder
Front View
Spacer
Fastening Bolt
Screw for Removal
Spacer
Slit
Fastening Bolt Fastening Bolt
Side View
Screw for Removal
Spacer
Fig. 12
CAUTION
・How to confirm the tightening standard of the holder by the clamp meter.
Measure the current value of the Control Unit'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 20mA (for type 100V / 120V) / 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 overtighten the Fastening Bolt.
It may damage spindle's precision and shorten the life of the bearings.
・The final 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 specifications.
Please carefully check the spindle's specifications against the requirements of your equipment
and verify suitability and safety of the Holder prior to initial use.
CAUTION
Do not over tighten the screw. This may cause damage to the spindle's precision.
7. INSTALLATION OF DUST COLLECTOR
①Align the screw of dust collector with V-shaped
groove.
②Tighten the screw (cup point screw or truncated
cone point screw) with less than 50cN・m.
Screw (M4) Dust Collector
Fig. 6
Table 2. Overhang and Speed
Overhang (mm) Max. Speed (min-1)
20 N x 0.5
25 N x 0.3
50 N x 0.1
※N = Max. Operating Speed with 13mm overhang. Fig. 13
3.14 x Diameter (mm) x rotation speed (min-1)
1,000 x 60
Surface Speed (m/s)
=
10. CAUTIONS IN USING GRINDSTONES AND TOOLS
①The proper surface speed for general grindstones is 10 -30 m/s.
②Do not exceed 13mm of overhang for mounted grindstones as shown in Fig. 13. If the overhang must
exceed 13mm, reduce the motor speed in accordance with Table 2.
③Dress the grindstone prior to use.
④Do not use tools with bent or broken shanks, cracks or excessive run - out.
⑤For 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.
⑥Always operate tools within the allowable recommended speed of the tools. Use of a tool outside of the
allowable speed of the tools could cause damage to the spindle and injury to the operator.
⑦Keep the 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 tool and or spindle.
⑧Do not strike or disassemble the spindle.
⑨Please set the tools to minimize the overhang amount. 13mm is the maximum amount of overhang to
maintain high accuracy and safety.
13
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.
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2015.07.20 002