NAKANISHI MSS-25 Series Air Motor Spindle Owner’s Manual

NAKANISHI MSS-25 Series Air Motor Spindle Owner's Manual

Thank you for purchasing Air Motor Spindle MSS – 25 series. This Air Motor Spindle is designed for grinding, small diameter drilling and milling with a NC lathe or special purpose machine. The Air Line Kit and compressor are required to drive this Air Motor Spindle. Read this and all the associated component Operation Manuals carefully before use. Always keep this Operation Manual in a place where a user can referred to for reference at any time.

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 to the operator or damage to the device. These are classified as follows in accordance with the seriousness of the risk.

⚠ WARNING

1. This Air Motor 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 Air Motor Spindle whenever the Air Motor Spindle is rotating.
4. Never operate or handle the Air Motor Spindle until you have thoroughly read the Operation Manuals and safe operation has been confirmed.

1. To prevent injuries / damages, check the Air Motor Spindle and cutting tool for proper installation, before operating the Air Motor Spindle.
2. Before disconnecting the motor spindle, always turn the control power off and turn the compressed air supply off. Then it is safe to remove the Air Motor Spindle.

5. When installing a tool, tighten the collet chuck correctly and check again the collet chuck and chuck nut before use.
6. Do not over – tighten the collet chuck. This may cause damage to the spindle. Do not use bent, broken, chipped, out of round or sub-standard tools, as this may cause them to shatter or explode. Tools 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.
7. Do not exceed the maximum recommended allowable tool speed. For your safety, use speeds below the maximum allowable speed.
8. Do not apply excessive force. This may cause tool slippage, tool damage, injury to the operator or loss of concentricity and precision.

⚠ CAUTION

1. Do not drop or hit this Air Motor Spindle, as shock can damage to the internal components.

2. Before use, carefully read ” Air Line Kit Operation Manuals ” regarding the correct connection, operation and cautions when using the Air Line Kit.

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 Air Motor Spindle, stop the Air Motor Spindle and remove debris with a soft brush or a cloth. Do not blow air into the dust proof cover area (refer to section 3 – 2 ” Outside View “) with compressed air as foreign particles or cutting debris may get into the ball bearing.

5. Always 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.

7. Select suitable products or tools for all applications. Do not exceed the capabilities of the Air Motor Spindle or tools.

8. Carefully direct coolant spray to the tool. Do not spray directly on the Air Motor Spindle body.

9. Stop working immediately when abnormal rotation or unusual vibration are observed. Immediately, please check the content of section 11 “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 carry out break – in as follow. Start rotating slowly and over a short period of 15 – 20minutes, increase speed gradually until allowable maximum speed.

13. Do not disassemble, modify or attempt to repair this Air Motor Spindle. Additional damage will occur to the internal components. Service must be performed by NSK NAKANISHI or an authorized service center.

14. When using this Air Motor Spindle for mass production, please consider the purchase of an additional Air Motor Spindle to be used as a back-up in case of emergency.

2. FEATURES

1. No heat is generated for long continuous use due to air driven operation.
2. The Air Motor Spindle housing is made from precision ground, hardened, stainless steel (SUS) with an outside diameter of 25mm.
3. By mounting a silencer on the back air / oil hose, the quiet operation of Air Motor Spindle is remarkably improved.
4. 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

3 – 2 Outside View

3 – 3 Torque Characteristics

4. CHANGING THE 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 removing the collet chuck.

⚠ RECOMMENDATION
Please minimize the tool overhang amount to maintaining high accuracy.

1. Set the provided 12mm wrench on the spindle.
2. Place the provided 14mm wrench on the chuck nut and turn it counter clockwise 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. Clean the collet chuck and chuck nut, then insert the new tool and tighten the collet chuck by turning clockwise. Do not overtighten.

5. REPLACING THE COLLET CHUCK

⚠ CAUTION
When installing the collet chuck in the chuck nut, make sure to fully engage the latch inside the chuck nut to the groove on the collet chucks outer circumference area. In addition, remember that if the collet chuck is attached without being engaged with the latch of the chuck nut, the collet chuck cannot be removed and this may cause damage to the collet chuck or the spindle.

1. Remove the tool according to the section ” 4. CHANGING THE TOOL” procedure above and remove chuck nut assembly. (Fig. 9)
2. The collet chuck and chuck nut are secured by a groove in the collet chuck and a flange in the chuck nut. To remove the collet chuck hold the chuck nut in one hand and push diagonally down on the collet chuck. The collet chuck should be released.(Fig. 10).
3. To install the collet chuck, hold the collet chuck at a slight angle, and insert it into the chuck nut (Fig. 11). Press the collet chuck in the chuck nut by positioning the collet chuck in the chuck nut and pressing down on flat surface (Fig. 10). Be sure to fully engage the latch inside the chuck nut into the groove on the collet chucks outer circumference area (Fig. 12).

6. INSTALLATION OF THE AIR MOTOR SPINDLE

⚠ CAUTION

• When installing a Air Motor Spindle, do not hit, drop or cause shock to the Air Motor Spindle. This may cause damage to internal components and result in malfunctions.
• When mounting the Air Motor Spindle, be sure to mounting within clamping area etched on the Air Motor Spindle. If the Air Motor Spindle is installed incorrectly, this will cause and damage to the Air Motor Spindle.
• Cautions when tightening the securing bolt of the Split Type Holder Do not over-tighten the bolt. This may cause damage to Air Motor Spindle’s precision. Tighten the bolt until the Air Motor 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 Air Motor Spindle is tight before using.

1. When mounting a Air Motor Spindle, refer to the Clamping Area etched on the Air Motor Spindle. These Air Motor Spindle have 2 Clamping Area refer to ” 3 – 2 Outside View (Fig. 1 – Fig. 6).
2. When installing a Air Motor Spindle to the holder, recommended installation method is shown Fig 13. Refer to ” How to fabricate the Split Type Holder “. If this is not possible, install as shown in Fig. 14.

⚠ CAUTION
Do not allow set screws to come directly in contact with the Air Motor Spindle body as shown in Fig. 15, as this will result in damage to the Air Motor Spindle housing and internal components. When installing, never clamp directly over the bearings, as this will result in bearing damage. (Refer to Fig. 16)

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 the specified torque.
(6) Finish the Split Type Holder so that the inside diameter of the Split Type Holder is Air Motor Spindle’s outside diameter (Refer to Table 3). The correct tolerance range for the holder is -0.01mm to -0.015mm and a roundness and cylindricity of less than 5m.

(7) When inserting the Air Motor Spindle loosen the Fastening Bolt and twist the Screw for Removal, and widen the Slit Area.

7. INSTALLATION OF 90ANGLE TYPE (RA) MOTOR SPINDLE

⚠ CAUTION
The standard length of Air / Oil Inlet Hose is 2m, and Outlet Air / Oil Hose is 1m. When the both hose is longer than the standard length, the rotating speed is decreased.

1. Remove Air Inlet and Outlet Pipes from the Air Motor Spindle.
2. After pipes are removed, insert straight Air Motor Spindle from the front side of holder and fix it properly.
3. Mount Air Inlet and Outlet Pipes on the Air Motor Spindle fixed on the holder and connect air / oil hose to the quick disconnect Joint of Air Inlet and Outlet Pipes. Air Inlet air / oil hose (6 x 4) and Air Outlet air / oil hose ( 8 x 6).

8. CONNECTION OF AIR LINE KIT

⚠ CAUTION

• Make sure to turn the compressed air supply to the Air Line Kit OFF, before replacing the Lubricating Oil or draining the water in Lubricating Oil.

1. Connect the Filter Joint to the Secondary Joint (6 One – Touch Joint) of the Air Line Kit.
2. Fill Oil Reservoir through the Oil Filler Cap with recommended NAKANISHI Lubricating Oil (K – 211 : Air Line Kit’s Standard Accessories) to Upper Limit of the Fig. 21. Disconnect from air supply prior to opening Oil Filler Cap. Do not over or under fill.
3. Connect the 6mm air hose (Air Line Kit’s Standard Accessories) to the Primary Joint of the Air Line Kit and Compressor.
4. Supply air from the air compressor and turn the Regulator Knob (clockwise : increased) to set air pressure between 0.3 – 0.5 MPa.
5. Turn the ON / OFF Valve and rotate the Air Motor Spindle with recommended proper air pressure. Adjust the Oil Drip Rate to the recommended volume which is 1 to 3 drops / min. (Commercially Air Line Kit is same Oil Drip Rate). *If using the ” AL – 0304 ” or ” K – 239 ” Air Line Kit, adjust the proper Oil Drip Rate to 30 – 40 drops / min. (Refer to ” AL – 0304 ” or ” K – 239 ” of the Air Line Kit Operation Manuals.
6. Be sure to adjusted to proper Oil Drip Rate before using the Air Motor Spindle.

⚠ CAUTIONS IN USING AIR LINE KIT

• When connecting the Compressor and Air Line KIt, recommended install the air filter or air dryer to between Compressor and Air Line Kit in order to supply clean dry air to the Air Motor Spindle. Using compressed air containing excessive moisture could result in malfunction or failure of the Air Motor Spindle. If excessive moisture or condensation are found in Air Filter Bowl, it will be necessary to install a dryer and larger Air Filter on the Primary Joint side of the Air Line Kit to prevent and remove excessive moisture.
• Connect the air / oil hose securely to avoid accidental disconnection during use. Input pressure should never exceed 1.0MPa. Pressure exceeding 1.0MPa may cause the air / oil hose to rupture.
• Make sure operation air pressure is less than 1.0MPa before connecting the air / oil hose. If operation air pressure is exceeded the 1.0MPa, this may cause injury to the operator by accidental disconnection during use.
• Before use, carefully read ” Air Line Kit Operation Manuals ” regarding the correct connection, operation and cautions when using the Air Line Kit.

9. AIR LINE KIT OPERATION

1. Draining from Air Filter (Fig. 20)
   Opening and closing the Drain Valve.
   Counter clockwise direction : Draining
   Clockwise direction : Stop draining

⚠ CAUTION

• Make sure to turn the compressed air supply to the Air Line Kit is OFF, before replacing the Lubricating Oil or draining the water in Lubricating Oil.
• Check the Lubricating Oil level everyday and before use. If Lubricating Oil level is low, Fill the oil bowl with Lubricating Oil up to the Upper Oil Limit on the bowl.
• If collected water in the lubricator taints Lubricating Oil, replace the Lubricating Oil immediately.

Oil Amount (Fig. 21) Check the Oil Amount in the Window. If the Lubricating Oil level is low, add additional oil. Supply Lubricating Oil to Upper Oil Level Limit of Fig. 21.

Adjustment of Oil Drip Rate (Fig. 22)
Set the air pressure to the Air Motor Spindle recommended maximum air pressure. Turn the adjusting dome and adjust the Oil Drip Rate to the recommended volume which is 1 to 3 drops / min (If using the ” AL – 0304 ” or ” K – 239 ” Air Line Kit, adjust the proper Oil Drip Rate to 30 – 40 drops / min).
Counter clockwise direction : Increase
Clockwise direction : Decrease

Lubricating Oil
Use ISO VG15 Liquid Paraffin (Shell Ondina Oil #15) in the Air Line Kit lubricator bowl. (For U.S.A. specification, use Chevron Superla #9).

10. CAUTIONS WHEN USING GRINDSTONES AND TOOLS

⚠ 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 manufacturer’s recommendations.

Surface Speed (m / s) = 3.14 x Diameter (mm) x Rotation Speed (min-1) (rpm)
                                                                     1,000 x 60

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. 23. If the overhang must exceed 13mm, reduce the motor speed in accordance with Table 4.
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 minimize the tool overhang amount to maintaining high accuracy. 13mm is the maximum amount of overhang to maintain high accuracy and safety.

Table 4. Overhang and Speed

11. TROUBLESHOOTING

If a problem or concern occur, please check the following items prior to consulting your dealer.

12. DISPOSAL OF THE AIR MOTOR SPINDLE

When disposal of an Air Motor Spindle is necessary, follow the instructions from your local government agency for proper disposal of industrial components.

NAKANISHI INC,
700 Shimohinata, Kanuma
Tochigi 322-8666 Japan
www.nakanishi-inc.com

NSK America Corp.
1800 Global Parkway
Hoffman Estates
IL 60192, USA
www.nskamericacorp.com

NSK Europe GmbH
Elly-Beinhorn-Strasse 8
65760 Eschborn
Germany

NSK United Kingdom Ltd.
UK Authorised RpntHntative
Office 4, Gateway 1000
Arlington Business Park, Whittle Way
Stevenage,SG1 2FP, UK

Contents are subject to change without notice.

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