Nakanishi NR-303 Operation Manual

Spindle
NR-303
OPERATION MANUAL
Thank you for purchasing this spindle. This spindle is designed for grinding, small diameter drilling and milling.
Control unit, electric motor and air line kit are required to drive this spindle. Please read this Operation Manual
carefully before use.
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.
Class
A safety hazard could result in bodily injury or damage to the device if the
WARNING
safety instructions are not properly followed.
A hazard that could result in light or moderate bodily injury or damage
CAUTION
to the device if the safety instructions are not followed.
WARNING
① The spindle is not a hand tool. It is designed to be used on CNC machines or special purpose
machines.
② Do not touch the cutting tool while it is running. It is very dangerous.
③ Wear safety glasses, dust mask and hearing protection, and use a protective cover around the
spindle whenever the spindle is rotating.
④ Never touch the power cord with wet hands. This may cause an electric shock.
⑤ Never 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, then
operate the spindle.
2 ) Before disconnecting the spindle, always turn the control power off and turn the compressed
air supply to the control unit off. It is then safe to remove the spindle.
⑥ When installing a tool, tighten the collet chuck correctly and check again the collet chuck and
chuck nut before use. Do not over tighten the collet chuck. This may cause damage to the
spindle.
⑦ Do not use bent, broken, chipped, out of round or sub-standard tools as they can shatter or
explode. It shatters, it cracked, and the tool that bends and breaks disperses and it causing
injures. When using a new tool, rotate it in a low speed and increase speed gradually for safety.
⑧ Do not exceed the maximum recommended allowable tool speed. For your safety, use speeds
below the maximum allowable speed.
⑨ Do not apply excessive force. This may cause tool slippage, tool damage, injury to the
operator, loss of concentricity and precision.
CAUTION
① Do not drop or hit the spindle, as shock can damage to the internal components.
② Do not connect this spindle to the air motor AM-600. This cause damage to the spindle, or
brekage by heat generation.
③ Be sure to clean the collet chuck and chuck nut, 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.
④ When cleaning a spindle, stop the motor and remove dirt with a brush or a cloth. Do not blow
air to a dust proof cover area (refer to Section 3 - 2 "Outside view" ) with compressed air,
foreign particles or cutting chips might get into the ball bearing.
⑤ Always clean the tool shank before installing the tool in the spindle.
⑥ Use only tools with shank diameters within the tolerance of the selected collet chuck.
⑦ Select suitable products or tools for all applications. Do not exceed the capabilities of the
spindle or tools.
⑧ Carefully direct coolant spray to the tool. Do not spray directly on the spindle body.
⑨ Stop working immediately when abnormal rotation or unusual vibration are observed.
Afterwards, please check the content of Section 10 "TROUBLESHOOTING".
⑩ Always check if the tool, collet chuck or chuck nut are damaged before and after operating.
⑪
If the collet chuck or chuck nut show signs of wear or damage, replace them before a
malfunction or additional damage occurs.
⑫ After installation, repair, initial operation, or long periods of non operation, please refer to
Section 8. "BREAK-IN PROCEDURE" detailed in Table 1. When checking the spindle, no
vibration or unusual sound should be observed during rotation.
⑬ Do not disassemble, modify or attempt to repair the spindle. Additional damage will occur to
the internal components. Service must be performed by NSK NAKANISHI or an authorized
service center.
⑭ When using the spindle for mass production, please purchase the another spindle as a spare
in case of an emergency.
2 . FEATURES
① The spindle housing is made from precision ground, hardened, stainless steel ( SUS ) with an outside diameter
of 22.8mm.
② This spindle utilizes precision bearing. Designed to minimize the radial and axial plays.
③ Various sizes of collet chucks are available CHK 0.5 mm - 6.35 mm.
Standard collet chuck is CHK 3.0mm or CHK 3.175mm. (For U.S. market CHK-3.175mm.)
OM-K0466E 001
Degree of Risk
3 . SPECIFICATIONS AND DIMENSIONS
3 - 1 Specifications
Model NR-303
-1
Allowable Motor Speed 30,000min
Spindle Accuracy Less than 2μm
Weight 215g
Standard Accessories
3.0mm ( CHK-3.0 ) or 3.175mm ( CHK- 3.175 ) ・・1pc.
・ Collet Chuck
3.175mm ( CHK-3.175 )
(For U.S. market :
・ Chuck Nut ( K -265 ) ・・1pc.
・ Wrench ( 20 × 24 ) ・・1pc.
< Option >
Collet Chuck ( CHK- □□ )
0.5mm - 6.0mm in 0.1mm incremants and
Chuck Nut
K-265
3 - 2 Outside View
Dust Proof Cover Area
（16.9）
4 . CONNECTING TO THE MOTOR
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.
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 cutting tool by hand to engage the drive shaft and the drive
dog, and make the final turns with wrench 20mm provided. ( Fig. 2 )
5 . CHANGING THE CUTTING TOOL
CAUTION
Do not tighten the collet chuck without inserting a tool or dummy bur, as this will damage the
collet chuck, spindle or chuck nut, causing difficulty remove the collet chuck.
① Set the provided 12 mm wrench on the spindle.
② Place the provided 14mm wrench on the chuck nut and turn it counterclockwise to loosen the collet chuck and
remove the cutting tool. ( The first turn will loosen the chuck nut, but the tool will not release and turning will
become stiff. Keep turning through the stiffness and the collet chuck will open. )
③ Inset the new cutting tool and tighten the collet chuck by turning clockwise.
Chuck Nut
・ Wrench ( 12 × 14 ) ・・2pcs.
・ Operation Manual・・1set.
※ The collet chuck and the chuck nut are attached to the spindle.
2.35mm, 3.175mm,
13.3
76.6
（106.8）
Fig. 1
Transmission Clutch
Tighten
Turn
20
Fig. 2
Cutting Tool
Loosen
Spindle Shaft
Tighten
Fig. 3
6.35mm.