OPERATION MANUAL
003
OM-K0394E
Spindle
NR-2551
・
NR-H2551
NR-2532
・
NR-H2532
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
2
. FEATURES
①
The spindle housing is made from precision ground, hardened, burned stainless steel (SUS) with an outside
diameter of
ȭ
25mm /
ȭ
25.4mm.
②
The NR-2532/H2532 utilize angular bearings for 30,000min
-1
. The NR-2551/H2551 utilize ceramic bearings for
50,000min
-1
.
③
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.)
3
. SPECIFICATIONS AND DIMENSIONS
3 - 1 Specifications
Model
NR-2532 / NR-H2532
NR-2551 / NR-H2551
Allowable Motor Speed
30,000min
-1
50,000min
-1
Spindle Accuracy
Within 1μm
Weight
258g
253g
Outside Diameter
ȭ
D
ȭ
25mm (NR-2532)
ȭ
25.4mm (NR-H2532)
ȭ
25mm (NR-2551)
ȭ
25.4mm (NR-H2551)
Standard Accessories
・
Collet Chuck
ȭ
3.0mm (CHK-3.0) or
ȭ
3.175mm (CHK-3.175
）・・
1pc.
・
Chuck Nut (K-265)
・・
1pc.
・
Wrench (12
×
14)
・・
2pcs.
・
Wrench (22
×
27)
・・
1pc.
・
Operation Manual
・・
1set.
Collet Chuck (CHK-
□□
)
ȭ
0.5 mm
〜
ȭ
6.0 mm in 0.1 mm increments and
ȭ
2.35mm
、
ȭ
3.175mm
、
ȭ
6.35mm
Chuck Nut
K-265
<Option>
※
The collet chuck and chuck nut are attached to the spindle.
3 - 2 Outside View
（
106.8
）
㱢
15.9
（
16.9
）
76.6
13.3
㱢
D
㱢
17.1
Dust Proof Cover Area
Fig. 1
4
. CONNECTION TO THE MOTOR
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 22mm
provided.
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
5
. CHANGING THE TOOL
Spindle Shaft
14
12
Loosen
14
12
Tighten
Tool
Chuck Nut
Turn
22
22
Transmission Clutch
Tighten
Fig. 3
Fig. 4
①
Set the provided 12mm 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 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 tool and tighten the collet chuck by
turning clockwise.
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
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.
CAUTION
①
Do not drop or hit the spindle, as shock can damage to the internal components.
②
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.
③
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.
④
Always clean the tool shank before installing the tool in the spindle.
⑤
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.
⑥
Select suitable products or tools for all applications. Do not exceed the capabilities of the
spindle or tools.
⑦
Carefully direct coolant spray to the tool. Do not spray directly on the spindle body.
⑧
Stop working immediately when abnormal rotation or unusual vibration are observed.
Afterwards, please check the content of Section 10 "TROUBLESHOOTING".
⑨
Always check if the tool, collet chuck or chuck nut are damaged before and after operating.
⑩
If the collet chuck or chuck nut show signs of wear or damage, replace them before a
malfunction or additional damage occurs.
⑪
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.
⑫
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.
⑬
When using the spindle for mass production, please purchase the another spindle as a spare
in case of an emergency.
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 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. Then it is 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 may cause
shatter 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.
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
・
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 and speed reducers.
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.