Air-Speed
FAQ
You can search for frequently asked questions.
Air-Speed
Specifications
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Is it safe to run a motor spindle in wet conditions using machining coolants and oils?
Yes. All Nakanishi motor spindles have an IP57 Rating by using purging air. However, the coolant should be directed to the cutting tool and not directly towards the motor spindles.
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What is the proper procedure to maintain spindle accuracy under normal operating conditions?
Any time a tool or collet is being replaced, it is recommended to remove the collet and collet nut, then clean them as well as the spindle taper with an alcohol swab to remove any cutting debris. This will help maintain spindle accuracy and improve longevity.
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What is the advantage of an integral motor/spindle?
Nakanishi motor spindles have no gears. Gears generate heat, vibration and thermal growth, all of which are a deterrent to high speed rotation.
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What is the difference between Nakanishi motor spindles and other companies' spindle speeders?
Nakanishi motor spindles are integrated motor and spindle that do not use the machine spindle rotation.
Other companies’ spindle speeders are driven by the machine spindle with gears to increase or decrease the rotation speed. -
What is the difference between electric motor spindles and air motor spindles?
We recommend the electric system for its rotation speed control function, load factor visualization, excellent automation compatibility, and stable processing performance.
The air system is less expensive in terms of initial cost, but the electric system is more economical in terms of operating cost, considering the power consumption of the compressor that produces the air.
In addition, the electric system is also an energy-saving and environmentally friendly measure. -
What is the maintenance period and expected life of motor spindles?
Motor spindles are used under a variety of conditions, such as processing method, processing load, workpiece material, and tools used. For this reason, we do not specify a specific maintenance period and expected life. The internal parts, especially the bearings, will wear out gradually. Have your motor spindles overhauled regularly.
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What are the high precision type AA collets?
The runout accuracy of the high precision type AA collets are within 2 μm.
Only the CHK and CHA groups have the high precision type AA collets as listed below.
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How do I use grease for reducers?
Be sure to use our specified greases as listed below. Inject approximately 0.5 mL of grease at every 70–100 hours.
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What is the IP rating (protection class for dustproof and waterproof performance) of the products?
• Electric motor spindles
It is IP57 when air is supplied for dustproofing and cooling.• Air motor spindles
It is equivalent to IP57 when air is supplied to the air motor (when the air motor is rotating).Coolant should be directed at the cutting tool and not directly at the electric/air motor spindles.
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What is the definition of motor rotation direction?
It is defined by the motor model as follows:
• Motor model R/RA: forward rotation (clockwise)
• Motor model L/LA: reverse rotation (counterclockwise)
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What lubricating oil is used in the air line kit?
Be sure to use ISO VG 15 liquid paraffin (Shell Ondina Oil 15). To purchase it, contact our distributor near you.
For USA specification, use FUCHS Superla #9 White Oil.
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What is oil mist lubrication?
Air motor spindles require an oil mist supply from the air line kit with lubricator. The function of the lubricator in the air line kit is to suspend lubricating oil in the compressed air in the form of a mist. This oil mist lubricates the inside of the air motor, greatly extending the life of the air motor.
Our recommended lubricator is used with the drop volume set at approximately 1–3 drops per minute, as well as commercially available lubricators. -
How do I connect the air motor to the air line kit?
The filter joint is attached to the end of the air motor’s air intake hose (on the side that connects to the air line kit). The tip of the filter joint is φ6 mm and can be easily connected to the quick air fitting of the air line kit.
The length of the air intake hose for the air motor is set to 2 m. Changing the length of the air intake hose may reduce performance.
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What are the specifications (outer and inner diameter) of the air intake and exhaust hose for the air motor?
Hose sizes are detailed in the Air-Speed catalog.
＞Link to catalog
Depending on the model of air motor, there are two types of hose sizes: commercially available and our original.
Our original sizes are as follows (O.D. × I.D.):
• φ5.7 mm × φ3.7 mm and φ6.5 mm × φ5.0 mm: K-221 Hose (Code No. 2049)
• φ6.7 mm × φ4.5 mm and φ7.5 mm × φ5.5 mm: K-204 Hose (Code No. 2030) -
What is the tightening torque for the collet?
It varies depending on the type and size of the collet.
For CHK collet φ3.0–6.35, the appropriate tightening torque is 7.0 N·m. For the other sizes, refer to the chart below.
For CHA collet φ3.0–4.0, the appropriate tightening torque is 6.0 N·m. For the other sizes, refer to the chart below.
For CH16 collet, the appropriate tightening torque is 8.0 N·m.
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How can I obtain the product dimensions?
Refer to the each catalog.
＞Link to catalogsAs for the motor spindles, CAD drawings (DXF/STEP) can be downloaded from the products list page.
＞Link to products list -
What are the advantages of electric motors compared with air motors?
Electric motors are driven by electricity. The rotation speed can be adjusted in a wide range by a high-performance microcomputer. In addition, the rotation speed can be accurately displayed by a high-precision rotation detector.
Air motors are driven by air pressure from 0.3 MPa to 0.5 MPa. The rotation speed can be adjusted, but it cannot be fine-tuned and displayed. -
What is the difference between motor spindles and micro grinders?
Motor spindles are designed to be mounted on machines. Be sure to use them mounted on the machines.
Micro grinders are designed to be used by hand. Be sure to use them as hand tools. -
What is the allowable rotation speed of spindles and reducers?
It is the maximum input speed of spindles and reducers. It is marked MAX xxxxx min-1 on the housing of each product. Be sure to use them within the allowable rotation speed.
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What is the spindle accuracy?
It is the runout value measured at the tapered inner diameter of the collet mating part of the spindle.
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What is the purpose of a reducer?
It is used to reduce the rotation speed and increase the torque. By attaching a reducer, the rotation speed is reduced and the torque is increased by the reduction ratio.
For example, if a 1/4 ratio reducer is attached to a 30,000 min-1 motor, the rotation speed is reduced to approximately 7,500 min-1 and the torque is increased approximately 4 times. -
How do I replace collets and tools for the spindles?
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How do I install the grip ring to the spindle?
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How do I fabricate the split type holder?
- Rough processing the inner diameter of the holder.
- Make a slit in the holder (e.g., 2 mm slit).
- Tighten the screw for removal and widen the slit.
- Insert the spacer (e.g., 2 mm thick) into the slit.
- Loosen the screw for removal, and tighten the fastening bolt to the specified torque.
- Finish the inner diameter of the holder to a tolerance of -0.01 to -0.015 mm to the outer diameter of the spindle, and the surface of the inner diameter to a roundness and cylindricity of 5 µm or less.
- Loosen the fastening bolt and tighten the screw for removal. Then widen the slit to insert the motor spindle.
*Due to the wide variety of dimensions and materials of the holders to be fabricated, the suitability of the holders should be determined by the system designer or specifier after analysis and testing as necessary. The suitability of the holder, the desired characteristics of the motor spindle, and the safety assurance are the responsibility of the person determining the suitability of the system, so these should be carefully considered prior to fabricate.
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How do I mount the spindle?
We have the grip rings for spindle sizes φ22.8, φ30, φ40, and φ50, which eliminate failure due to overtightening of screws and greatly reduce setup time.
If the grip rings cannot be used due to dimensional or space limitations, we recommend mounting as shown in Figure A. If this is not possible, try mounting as shown in Figure B.
Do not mount the spindle directly with screws as shown in Figures C-1 and C-2. The outer housing of the spindle will be deformed, resulting in rotation failure and overheating.
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How do I discuss the selection of Nakanishi products?
Contact our distributor near you.
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How can I try Nakanishi products before purchase?
Contact our distributor near you to check availability.
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How can I obtain operation manuals?
Contact the dealer which you purchased.
You can also download it from the links below.
＞Link to products list -
How can I obtain the latest catalog?
You can download it from the link below.
＞Link to catalogs -
How can I purchase Nakanishi products?
Contact our distributor near you, as we do not sell our products directly.
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What is the warranty on Nakanishi products?
Our products have a limited warranty. We will replace or repair the products free of charge under the following conditions:
- If there is a manufacturing defect.
- If there is a shortage of contents.
- If the product is damaged when the package is opened. This does not apply if the damage was caused by the customer’s negligence.
Please contact us or the dealer which you purchased.
NAKANISHI INC.
Industrial Sales Dept.
Business hours: 8:00 a.m.–5:00 p.m. JST
Closed on Saturdays, Sundays, and public holidays
TEL: +81 289 64 3520
webmaster-ie@nsk-nakanishi.co.jp -
How do I send my Nakanishi product for repair?
Send your product through the dealer which you purchased. If this is not possible, contact our distributor near you.