Thank you for purchasing this spindle. This spindle is suitable for grinding,
small diameter drilling and milling. The air motor or electric motor and air
line kit are required to drive this spindle. Read this Operation Manual
carefully before use to ensure years of trouble-free operation
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
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.
WARNING
The spindle is not a hand tool. It is designed to be used on CNC machines or special purposemachines.
Do not touch the cutting tool while it is running. It is very dangerous.
Wear safety glasses, dust mask, and use a protective cover around the spindle whenever thespindle is rotating.
Never touch the power cord with wet hands. This may cause an electric shock.
Never operate or handle the spindle until you have thoroughly read the owner’s manual andsafe operation has been confirmed.
To prevent injuries/damages, check the spindle and cutting tool for proper installation, thenoperate the spindle.
Before disconnecting the spindle, always turn the control power off and turn the compressedair supply to the control unit off. Then it is safe to remove the spindle.
When installing a tool, tighten the collet chuck correctly and check again the collet chuck andchuck nut before use. Do not over tighten the collet chuck. This may cause damage to thespindle.
Do not use bent, broken, chipped, out of round or sub-standard tools as they may causeshatter or explode. The tool with cracked, bended may cause some injury to operator.
When using a new tool, rotate it in a low speed and increase speed gradually
for safety.
Do not exceed the maximum recommended allowable tool speed. For your safety, use speedsbelow the maximum allowable speed.
Do not apply excessive force. This may cause tool slippage, tool damage, injury to theoperator, loss of concentricity and precision.
CAUTION
Do not drop or hit the spindle, as shock can damage to the internal components.
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.
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.
Always clean the tool shank before installing the tool in the spindle.
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.
Select suitable products or tools for all applications. Do not exceed the capabilities of the spindle or tools.
Carefully direct coolant spray to the tool. Do not spray directly on the spindle body.
Stop working immediately when abnormal rotation or unusual vibration are observed. Afterwards, please check the content of Section 10 “TROUBLESHOOTING”.
Always check if the tool, collet chuck or chuck nut are damaged before and after operating.
If the collet chuck or chuck nut show signs of wear or damage, replace them before a malfunction or additional damage occurs.
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.
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.
When using the spindle for mass production, please purchase the another spindle as a spare in case of an emergency.
FEATURES
The spindle housing is made from precision ground, hardened, burned stainless steel (SUS) with an outside diameter of φ25mm /φ25.4mm.
The NR-2551/H2551 utilize ceramic bearings for 50,000min -1.
Various sizes of collet chucks are available CHK 0.5mm-6.35mm. Standard collet chuck is CHK 3.0mm or CHK 3.175mm. (For U.S. market CHK 3.175mm.)
Spindle