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Air BearingsCompanies - 205

Air Bearings

ASHOKA MACHORD

Greater Noida

Ashoka technologies supplying and manufacturing cement plant that includes separators, ball mills, air slides, packing equipment, steel rolling mills, trunion bearings, cement plants with vertical shaft kilns, rotary kiln cement plants and mill headers.

About Us View Products View Video

Send EnquiryAddress:  D- 62-67, Epip Site- V, Kasna, Greater Noida, Uttar Pradesh - 201 301, IndiaMobile / Cell Phone:  +(91)-9810296963Website:  http://www.millgears.com/industrial-machineries.html

Shree Technologies Mumbai

Wholesaler & trader of pigment ink & epson pigment ink, brother photo ciss ink, silky pigment ink, hp-27-28-22-21-818-852-air removal stand. Also deals in bearings & bearing assemblies, gears, gear boxes, gear shafts, parts & related products.

Send EnquiryAddress: No. 71/73, 1st Floor, Office No-1 A, Bazar Gate Street, Opposite V. T. Station, Mumbai, Maharashtra - 400 001, IndiaPhone:  +(91)-(22)-22692020 / 40025224 / 66105224   Fax:  +(91)-(22)-22692020Mobile / Cell Phone:  +(91)-9892218963 / 9821929426Website: http://www.shreecartridge.com/printer-products-accessories.html

Star Newstar Bearing & Automotive Co. Delhi

Reputed exporter & importer of tn series polymide cage bearings,air condition,air compressor bearing series and air

bearings. Send EnquiryAddress: No. 1/1068, Bara Bazar, Kashmere Gate, Delhi, Delhi - 110 006, IndiaPhone:  +(91)-(11)-23915454 / 23967135   Fax:  +(91)-(11)-23932782Mobile / Cell Phone:  +(91)-9811008007 / 9312606648Website: http://www.indiamart.com/starmnrbearing/automotive-bearings.html

Track & Tracto Kolkata

We are manufacturer of air filters, loader spare parts, excavator buckets, mechanical bearings etc.

Send EnquiryAddress: No. 5, Khairu Place, Near Chandani Chowk, Metro Station, Kolkata, West Bengal - 700 072, IndiaPhone:  +(91)-(33)-22116496 / 22112896Mobile / Cell Phone:  +(91)-9831733179 / 9433402573Website: http://www.indiamart.com/track-tracto/earthmoving-equipment-parts.html

Kay Iron Works (Jorian) Private Limited Yamunanagar

Deals in supplying of cement plant that includes industrial cement plants, cement making plants, cement plant with grinding units, cement plant with mill bearings and air lifted cement plant.

Send EnquiryAddress: Radaur Road, Opposite Power House Jorian, Yamunanagar, Yamunanagar, Haryana - 135 001, IndiaPhone:  +(91)-(1732)-203163 / 203164   Fax:  +(91)-(1732)-203169Mobile / Cell Phone:  +(91)-9896000622 / 9896000458Website: http://www.kayironjorian.com/

Janak Enterprises Thane

Engaged in manufacturing and supplying of air bearing spindles that includes electric air bearing spindles, pipe cutting machine,tube cutting machine,bar cutting machine,tube end facing machinehigh frequency air bearing spindles and automatic air bearing

Send EnquiryAddress: Vadkun, College Road, Dahanu Road, Thane, Maharashtra - 401 602, IndiaPhone:  +(91)-(2528)-222463 / 654952 / 223970   Fax:  +(91)-(2528)-222463Mobile / Cell Phone:  +(91)-9975669481 / 8087337171Website: http://www.indiamart.com/janakenterprises/industrial-machines.html

Shri Ram Engineers Rajkot

Manufacturer and supplier of shipping spare parts which include compressor spares, refrigeration compressor spares and air compressor spares including crankshafts, piston assemblies, bushes, bearings, liners, connecting rods and valve plates.Send EnquiryAddress: Shri Ram Estate, Gondal Road, Outside Railway Crossing, Opposite Shivalik - 4, Rajkot, Gujarat - 360 004, IndiaPhone:  +(91)-(281)-2360530 / 2368362   Fax:  +(91)-(281)-2360414 / 2380310

Mobile / Cell Phone:  +(91)-9974041892Website: http://www.indiamart.com/srengineers/engine-generator-parts.html

Dhruman Engineering Company Mumbai

Offering compressor spares, compressor parts, compressor valve plates, compressor oil pumps, refrigeration compressor spares, air compressor spares, compressor bearing, compressor gasket, gasket sets, compressor piston pins, compressor piston, oil filters

Send EnquiryAddress: No. 26, 29- B, 2nd Floor, Navalkar Building, Kennedy Bridge, Opera House, Mumbai, Maharashtra - 400 004, IndiaPhone:  +(91)-(22)-65002410   Fax:  +(91)-(22)-66367141Mobile / Cell Phone:  +(91)-9867682233 / 9322236170Website: http://www.indiamart.com/dhrumanengg/compressor-spares.html

Air & Gas Compressor Spares (india) Private Limited New Delhi

Manufacturing and exporting bearings, bearings assembles, designed bearings, aluminium bearings, iron bearings. Also engaged in air compressor pump, pneumatic air compressor, air compressor spare parts, air cooled heat exchanger etc.Send EnquiryAddress: E-10-12, Triveni Complex, Jawahar Park, Laxmi Nagar, New Delhi, Delhi - 110 092, IndiaPhone:  +(91)-(120)-2897304 / 2897306 / 2897276   Fax:  +(91)-(120)-4134182Mobile / Cell Phone:  +(91)-8802234555Website: http://www.compressor-spares-manufacturer.com/

System Engineering Works Nashik

Established in 1999 we are a leading manufacturer of high frequency drilling spindles, air bearing spindles & from India.Send EnquiryAddress: W-160, M. I. D. C. Ambad, Nashik, Maharashtra - 422 010, IndiaPhone:  +(91)-(253)-6614185Mobile / Cell Phone:  +(91)-8007865449 / 9762005449Website: http://www.systemengg.net/high-frequency-spindles.html

Industrial Compressor Component Mumbai

Engaged in manufacturing compressor spares, air compressor spares and refrigeration compressor spares including piston assemblies, valve plates, connecting rods, liners, bearings, bushes and crankshafts.

Send EnquiryAddress: Gala no.B-1, aeka Apartment, Rani Sati Marg, Malad (E), Mumbai, Maharashtra - 400 097, IndiaPhone:  +(91)-(22)-40214595   Fax:  +(91)-(22)-28769485Mobile / Cell Phone:  +(91)-9819821666 / 9320520201Website: http://www.industrialcompressorcomponent.com/compressor-spares.html

M. T. Ind Mark Fans Private Limited Pune

Manufacturer & supplier of air bearings, air cooled bearings. Also offering bearing, bearing assemblies, water cooled pillow block, air cooled bearings, air cooled bearings and water cooled pillow block.

Send EnquiryAddress: No. 001, Raghukul Nagri - 38, Aundh Road, Bopodi, Pune, Maharashtra - 411 020, IndiaPhone:  +(91)-(20)-25823252Mobile / Cell Phone:  +(91)-9011063750Website: http://www.indiamart.com/mt-indmark-fans/fan-accessories.html

Mehta Brothers Mumbai

We are a company of 10 employees, offering bearing. We also offering power tools, hand tools, cutting and threading tools, fasteners, bearings, v-belt, grinding wheel and measuring instrument.

Send EnquiryAddress: B-3, Kailash Explande, Opposite Shreyash Cinema, L. B. S Marg, Ghatkopar West, Mumbai, Maharashtra - 400 086, IndiaPhone:  +(91)-(22)-25002020 / 25001393   Fax:  +(91)-(22)-25001393Mobile / Cell Phone:  +(91)-9820092052Website: http://www.indiamart.com/mehta-brother/automotive.html

S. D. Industries Ahmedabad Our product range includes graphite bearing. We are leading manufacturer of air bearings from India.Send EnquiryAddress: A/17, Chinai Baug Industrial Estate, Near Water Tank, Behind Bank Of Baroda, Dhudheshwar, Ahmedabad, Gujarat - 380 004, IndiaPhone:  +(91)-(79)-25620778 / 25620788   Fax:  +(91)-(79)-25621364Mobile / Cell Phone:  +(91)-9898369786 / 9898569786Website: http://www.indiamart.com/sd-industries/graphite-bearings.html

Machaero Company Private Limited Bengaluru Manufacturer of air bearings.Send EnquiryAddress: Veerapura Village, Doddadallatur Area, Bengaluru, Karnataka - 561 203, IndiaMobile / Cell Phone:  +(91)-9972092501Website: http://www.indiamart.com/company/4649801/

Jei Bearings, Rajkot Rajkot Exporters and manufactures air bearings like taper roller bearings, needle roller bearings, ball bearings, spherical roller bearings, cylindrical roller bearings, clutch bearings, clutch release bearings, four point contact bearings, etc.Send EnquiryAddress: Plot No. 138-141, Vavdi Survey No. 43/1, Near Akash Marble Behind Perfect Auto, Gondal Road, Rajkot, Gujarat - 360 004, IndiaPhone:  +(91)-(281)-2370110   Fax:  +(91)-(281)-2370157Mobile / Cell Phone:  +(91)-9824228157Website: http://www.indiamart.com/jei-bearings/

Hi Tech Transpower Private Limited

Rajkot Dealers of air bearings, automotive bearings and ball bearings.Send EnquiryAddress: 10, Navarangpara, Mavdi Plot Opp. Prima Product, Rajkot, Gujarat - 360004, IndiaPhone:  +(91)-(281)-2368376Website: http://www.indiamart.com/company/840848/

Vijaya Auto Products Bengaluru Manufacturer of air bearings.Send EnquiryAddress: 89, Near Bangalore Press, Mysore Road., Bengaluru, Karnataka - 560018, IndiaPhone:  +(91)-(80)-41313609 / 25502238Mobile / Cell Phone:  +(91)-9886767891Website: http://www.indiamart.com/company/3037234/

Jai Krishi Udyog Shamli Deals in exporting and manufacturing air bearings, ball bearings and plain ball bearings.Send EnquiryAddress: Muzaffarnagar Road, Shamli, Uttar Pradesh - 247 776, IndiaPhone:  +(91)-(1398)-250039 / 253263   Fax:  +(91)-(1398)-253263Mobile / Cell Phone:  +(91)-9758203922Website: http://www.indiamart.com/company/834668/

Padmasons Mumbai Engaged in manufacturing and exporting of air bearings.Send EnquiryAddress: 14-15 Commercial Chambers, 1st Floor 179 Yusuf Meherali Road, Mumbai, Maharashtra - 400003, IndiaPhone:  +(91)-(22)-23466699   Fax:  +(91)-(22)-23466699Mobile / Cell Phone:  +(91)-9820970777Website: http://www.indiamart.com/padmasons-bearings/

Mayur Bearing Center Vadodara Trader of air bearings.Send EnquiryAddress: Amul Building, Laheripura New Road, Vadodara, Gujarat - 390 001, IndiaPhone:  +(91)-(265)-2438880 / 2438880Mobile / Cell Phone:  +(91)-9428766377 / 9428766378Website: http://www.indiamart.com/company/3977285/

Matru Enterprise Vadodara Engaged in production of air bearings, ball bearings and plain ball bearings.Send EnquiryAddress: No. 856- 4, G I D C, Makarpura, Vadodara, Gujarat - 390 010, IndiaPhone:  +(91)-(265)-2633164   Fax:  +(91)-(265)-2633162Website: http://www.indiamart.com/company/835628/

Multi Dimensions Mumbai Selling and exporting air bearings, ball bearings, linear motion bearings and polymer bearings.

Send EnquiryAddress: E/19, Lijjat Godavari Socty, M. G. Road Kandivli West, Mumbai, Maharashtra - 400 067, IndiaPhone:  +(91)-(22)-32924154   Fax:  +(91)-(22)-27897304Mobile / Cell Phone:  +(91)-9821217472Website: http://www.indiamart.com/company/818201/

Global Bimetal Rajkot Engaged in manufacturing and selling air bearings, ball bearings and industrial bearings.Send EnquiryAddress: 102, Amrut Comm. Center Sardarnagar Main Road, Rajkot, Gujarat - 360 001, IndiaPhone:  +(91)-(281)-2465427   Fax:  +(91)-(281)-2464328Mobile / Cell Phone:  +(91)-9825481607

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spacer Air Bearing Components and Systems Services Application Examples What is an Air Bearing? Design Resources Buy Air Bearings Buy Air Bearings

Home > About Air BearingsProducts

Linear Air Bearings Rotary Air Bearings Air Bearing Spindles Spherical Air Bearings Air Bearing Bushings Flat Pad Air Bearings

Air Bearing Products

Linear Air Bearings

Rotary Air Bearings

Air Bearing Spindles

Spherical Air Bearings

Air Bearing Bushings

Flat Pad Air Bearings

Motorized Linear Air Bearing Stages

Motorized Rotary Air Bearing Tables

Fully Integrated XY Air Bearing Stages

Air Bearing Basics

What are Air Bearings?

Basically, air bearings use a thin film of pressurized air to support a load, the same way the puck on an air hockey table "floats" on air. This type of bearing is called a "fluid film" bearing. Fluid film bearings have no solid-to-solid contact under typical running conditions; instead, a film of lubricating fluid (in our case pressurized air) forms a layer between the solid machine elements and serves to transfer forces from one to the other. To compare this with ball bearings, in ball bearings the balls are in constant contact with and form a solid bridge between the machine elements.

Approximate Pressure Profilein an Air Bearing

The fluid is able to transfer forces because as the fluid is pushed through the bearing gap it generates a pressure profile across the bearing area. The force the bearing can support is then:

Air Bearing Benefits:

No solid to solid contact- No wear, particles orlubricants

Zero static friction Zero running friction High Stiffness Self Centering Error Averaging

Force = Avg. Pressure x Area

The actual pressure distribution in the bearing varies based on the bearing design and other parameters but a good rule of thumb is to expect 30% efficiency.

Force = 0.3 x Supply Pressure x Area

For flat pads and rectangular bearings this calculation is quite straightforward, but for journal and spherical bearings we use a few other approximations to estimate load capacity.

Fluid film bearings offer a number of advantages over mechanical bearings. First, because there is no contact, air bearings do not suffer from wear or heat generation due to friction. They also exhibit no starting or running friction, even under their highest design loading. In addition, the fluid film acts to center and average out small scale errors in the components resulting in motion which can be more accurate than the individual bearing components. Air bearings also offer much higher stiffness than rolling element bearings because the air film fully supports the components, as opposed to balls or rollers which have point or line contact and are therefore limited due to Hertzian contact stiffness.

Why Use Air?

While most people are familiar with oil fluid film bearings - for example the crankshaft journal bearings in car engines - most people have not been exposed to air bearings. Remembering our high school physics class, there are two basic types of fluids - liquids and gasses. In terms of fluid film bearings, the difference between these two is essentially the viscosity - liquids have much higher viscosity than gasses. When applied to a fluid film bearing, this difference has a number of implications.

Why we use air (instead of oil):

Air is clean, contaminant free Zero friction - no heat

generation at high speeds Small bearing gap means

high accuracy components,high accuracy motion

Air nitrogen of any othergas can be used

First, lower viscosity means that for the same working pressure gas bearings have lower load capacity (liquid fluid film bearings typically support five times the load of gas bearings for the same pad area). Second, because of the extremely low viscosity of gasses, gas film bearings operate with essentially zero static and running friction where liquid fluid film bearings have much higher friction and pumping losses within the bearings, which can cause heat generation. And third, gas bearings require very tight bearing gaps for proper operation (10 µm for gas compared to up to 100 µm for liquid bearing) which translates into extremely high accuracy requirements on the components.

What this means for air bearings is that although they have a lower load capacity, gas bearings have essentially zero friction at all speeds and because the tight bearing clearances demand high accuracy components this results in extremely high accuracy motion. Another benefit is the cleanliness of using air as a lubricating fluid as opposed to oil, water, or another fluid. Since compressed air is very common in industrial environments it is probably the most often used gas, however other gasses such as nitrogen can be used where they are available (such as in clean room environments).

Hydrostatic vs. Hydrodynamic?

The first question is how to generate the pressurized supply of fluid for the bearing. There are two ways to do this - one is using an external pressurized supply (hydrostatic) and the other is to use the relative motion of the machine components to generate the pressure internally (hydrodynamic or "self-generating"). While hydrodynamic bearings are common for oil

fluid film bearings, which generate internal pressures quite easily due to the relatively high viscosity of oil, it is much rarer to see this technique used for air bearings because the pressure generated is quite low (although Nelson Air has built bearings of this type for low load, high speed rotary applications such as optical scanners).

Hydrodynamic:Relative Motion

Generates Pressure

Hydrostatic: External Pressure Supply

Our typical air bearings are hydrostatic (or in our case aerostatic) and use a compressed air supply to create the fluid film. This supply should be clean and regulated to a constant pressure - simple off the shelf air handling components are more than adequate for most applications to clean, dehumidify, and regulate the supply. Typical operating pressures run as low as 20 psi up to 120 psi depending on the stiffness, load capacity, and air consumption requirements.

How does the air get into the bearing?

Porous Carbon Flat Pad

Drilled Nozzles withPocketed Compensation

("Setbacks")

Jewel Nozzle withPocketed Compensation

After entering the bearing and being routed though internal passages, the next step is to feed the pressurized air to where it is needed - namely directly into the bearing gap. There are two basic ways to accomplish this, orifices and porous media. For orifices, the air flows through a small hole (typically .004" to .015" dia.) into the bearing area. Porous media bearings use a porous material (typically carbon, bronze, or steel) which the air penetrates through into the bearing area.

The relative benefits of each approach are debatable. While orifices typically do not generate as uniform a pressure profile as can be achieved with porous media, there are ways to improve the pressure profile using a technique called "pocketed compensation". Porous media feeding provides more inherent damping than orifices, however proper sizing of the orifices can adjust damping. Orifices can become plugged if a very large particle gets into the air supply (this is extremely rare), where the porous media acts as a filter for the air. However, because of this filtering effect, over time the porous media itself can become clogged (oil vapor in the air is particularly bad) and a clogged porous bearing is much more difficult to clear than a clogged orifice.

Orifice fed bearings can be made from one piece of material (particularly when using drilled nozzles) where porous bearings are necessarily made using varying materials and adhesives.

At Nelson Air we have used both orifice and porous media feeding. Most of our standard products use pocket compensated orifices, however our LB series of linear bushings use porous bronze. Our typical orifice bearings are made using a special technique we have developed to drill the small orifices directly into the bearing, instead of using pressed in or glued in jewel nozzles. We believe that this technique reduces cost and complexity while increasing long term stability and reliability. However, jeweled nozzles are used when the design precludes drilled nozzles either because of geometry or because especially small orifice sizes (.004" for example) are required.

Geometry, Geometry, Geometry!

Air Film Averages out Local Variations

Because of the very small gaps that are required for air bearings, the single most important factor in their manufacture is absolutely flawless geometry. Any variation in part size, straightness, squareness or out of roundness will result in a closing of the gap and will cause the bearing to lose its frictionless nature as well as degrade accuracy and load capacity. Typical tolerances on our rectangular bearings which run air gaps of ~0.0005" are part deviations less than ±0.0001" overall. This same tolerance applies over the entire length of the bearing, which for some models can be over 60".

In addition, the part geometry is what determines the accuracy of the final bearing motion - even though local deviations are averaged out by the air film, the overall accuracy is dictated by how well the parts are made. Because of this, Nelson

Air has developed a variety of techniques and equipment which allow us to meet these stringent tolerances with repeatability and relatively low cost.

On Accuracy, Precision and Repeatability

Accuracy

Precision

Repeatability

Typical Air Bearing Specs:

Linear Accuracy:10 µin/in, 100 µin/36 in

Rotary Accuracy:±1 µin TIR

Roll/Pitch/Yaw: 0.25 arcsec/in

Linear Repeatability: ±10 µin

Rotary Repeatability: 1 µin

Positioning Resolution: to ±1 encoder count

To start this discussion it is best to briefly define what accuracy, precision and repeatability mean.

Accuracy is the measure of how closely the motion follows an ideal profile.Precision is the measure of how small the motion increments can be.Repeatability is the measure of how well the motion moves along the same path.

Air bearings offer the best of all worlds because they have excellent accuracy, precision and repeatability. They offer high accuracy because the components are manufactured with extremely tight tolerances and because of the air film's averaging effects. Typical linear accuracies are 10 µin/in with maximum deviation of 100 µin/36 in. Rotary runout can be as low ±1 µin. Air bearings also offer extremely good tilt characteristics - 0.25 arcsec/in.

Because air bearings exhibit no stiction or running friction, the precision achievable is only limited by the abilities of the motor/controller/encoder. Positioning precision of ±1 encoder count can easily be achieved using linear motors.

The repeatability of air bearings far exceeds that of mechanical bearings for the simple reason that they have no contact or wear. Heat generation in mechanical bearings sometimes require "warm up" periods during which there is thermal movement. Also, the mechanical preload on roller bearings can vary with temperature and cause the bearings to operate differently (varying friction for example) and lack repeatability. When working at the highest accuracy levels, these effects can cause mechanical bearings to lose their accuracy from hour to hour, day to day, or month to month. Because the accuracy of our air bearings is built into its solid metal components (made from one type of material for uniform thermal expansion), they can operate for years without any degradation in accuracy. This way, a calibration done one day will "stick". They also can be run at top speed without any need for warm-up time (excluding motor heating effects) and maintain their best accuracy.

Preloading Air Bearings

Method 1: Weight used topreload bearing

Method 2: Vacuum Preloaded

Method 3: Magnetic Preload

Method 4: OpposingAir Bearing Preload

While some configurations of air bearings are self-preloading (e.g. journal bearings) others such as flat pads and linear rectangular bearings can benefit from preload. Air bearings can be used without any preload (such as a simple flat pad riding on a granite surface), however, in order to maximize the stiffness of the air bearing and help maintain constant air gap it is typical to preload it using one of four basic methods:

Weight Preload Vacuum Preload Magnetic Preload Opposing Air Bearing Preload

The simplest method is weight. Using a weight much heavier than the expected variation in the loading of the bearing preloads the air bearing so it rides at a smaller (and stiffer) air gap and makes it less prone to height variations. This method has the drawback of adding moving mass but can work very will with systems which already have a large amount of mass and low forces (such as parts inspection). Needless to say, this only works for bearings which operate horizontally.

The second method is using a vacuum preload. A vacuum is used to apply a preloading force to the air bearing (instead of using a weight). This is accomplished by providing an area of the bearing surface over which a vacuum is applied. Because vacuum is limited to around negative 14 psi (atmospheric pressure) and typical air bearing pressures are 40-80 psi the net effect is still a lifting of the bearing, even when the bearing and vacuum areas are equal. Vacuum preload enhances the stiffness and helps to maintain constant air gap, without adding unnecessary moving mass. The main drawbacks to this method are the need for a larger bearing area to accommodate both pressure and vacuum and the requirement of a vacuum source. This method has been used successfully in many applications, especially for flat pads and planar systems which do not lend themselves to other forms of preload.

The third method of preloading is magnetic preload. Magnetic attraction between a magnet on the moving part and a magnetic material on the stationary part of the bearing loads the bearing and adds stiffness. This configuration works well for linear bearings and can be very cost effective because it reduces the tolerances required for the air bearing components (as compared to air bearing preloaded systems). However, because many air bearings are made from nonmagnetic materials, it requires adding other materials to the bearing (such as iron). Another drawback is that at high speeds, the magnet generates eddy currents in the iron which oppose the motion and add a drag force (eliminating the "zero friction" of air bearings). However, in many applications magnetic preload provides an effective method of preloading air bearings.

The final method is opposing air bearing preload. This method uses opposing air bearings to preload each other. This method provides twice the stiffness of a single air bearing, although the load capacity is reduced by almost half (the other preload methods also reduce load capacity, based on the amount of force they apply) and is very effective in producing the most accurate and reliable air bearings. Because there are two air bearings working in parallel it also has the effect of averaging any errors on either bearing (centering) and can therefore deliver higher accuracy than any other method. In addition, air bearing preloaded bearings can be operated in any orientation. The majority of Nelson Air's standard bearings use this method because we believe it provides the highest quality, accuracy and versatility. However, this method does require higher accuracy components with more precision surfaces.

Various Configurations for Air Bearings:

Now that you understand the basics of how air bearings work, here are some of the most common configurations for using them to create motion with a variety of degrees of freedom. If you have any additional questions, please contact us and we would enjoy assisting you.

Flat Pad: Planar (XY) and Rotary Motion

Air Bushing/Journal Bearing: Linear and Rotary Motion

Rectangular Air Bearing: Linear Motion Only

Dovetail Air Bearing: Linear Motion Only

Air Bearing Spindle: Radial Motion Only, High Radial Loads

Rotary Air Bearing Table: Radial Motion Only, High Axial Loads

Spherical Air Bearing: 3 Rotational Degrees of Freedom

 

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Linear Air Bearings Rotary Air Bearings Air Bearing Spindles Spherical Air Bearings Air Bearing Bushings Flat Pad Air Bearings

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About Air Bearings

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About Nelson Air

Contact Nelson Air

Nelson Air Corp

559 Rt 13 South

PO Box 2

Milford, NH 03055

 

Tel: 603-673-3908

Fax: 603-672-3008

 

e-mail: info@nelsonair.com

web: www.nelsonair.com  

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Air bearings

AIR BEARINGS

IBS Precision Engineering is exclusive representative of New Way Air Bearings in Europe,

offering porous media air bearings, the answer when precision motion is required.

Unique strength of porous media air bearings are:

Porous material, considerably better than conventional orifice air bearings due to better air distribution, Reliable,

Better crash resistance and damping, Zero friction, Zero wear, Straighter motion, Silent and smooth operation,

Eliminates oil, High speeds and acceleration, Low air consumption, Offering both standard and customised solutions

PRODUCTS

Flat

air

bearings

Flat Round Air Bearings New Way Flat Round porous media air bearings allow anyone to design and build their own custom air bearing assemblies. Read more >

Select your product

Flat air bearings - Round

200mm

150mm

125mm

100mm

80mm

65mm

50mm

40mm

25mm

Flat air bearings - Rectangular

150mm x 300mm

125mm x 250mm

100mm x 200mm

75mm x 150mm

50mm x 100mm

40mm x 80mm

40mm x 50mm

25mm x 50mm

20mm x 40mm

15mm x 30mm

12mm x 24mm

Air

bushings

Air Bushings The New Way air bushing is designed to make air bearing technology readily available to engineers with pre-existing designs based on round shaft guides. Read more >

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Air bushings - Metric

75mm

50mm

40mm

25mm

20mm

13mm

Air bushings - English

3.00 Inch ID

2.00 Inch ID

1.50 Inch ID

1.00 Inch ID

0.75 Inch ID

0.50 Inch ID

0.25 Inch ID

Vacuum

preloaded air

bearings

For applications where pre-loading is difficult or impossible, Vacuum Preloaded Air Bearings (VPLs) add vacuum to New Way Porous Media™ Technology. Read more >

Select your product

VPL 90mm

90 mm

VPL 75mm

75 mm

VPL 50mm

50 mm

Radial air

bearings

Radial air bearings are the ideal components for building frictionless rotary motion. Read more >

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Conveyor

air

bearings

New Way offers a line of modular air bearing components specifically designed to meet the non-contact glass-handling requirements of the Flat Panel Display and Solar Module manufacturing processes. Read more >

Select your product

Transition Zone Air Bar

Conveyor air bearings - H-series

Conveyor air bearings - L-Series

Flat Panel Display precision chucks

Air

slides

New Way manufactures an array of standard slides designed to enable the easy application of linear motion. Read more >

Select your product

Dovetail air slides

End supported air slides

Boxway air slides

Spherical

air

bearings

IBS Precision Engineering has expanded it's air bearings portfolio with spherical air bearings from New Way. Read more >

Select your product

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Introduction to Air Bearings

Home / Technical / Introduction to Air Bearings

Advances in engineering and technology frequently place severe new demands upon the support systems for

machine components required to be in relative motion both in regard to improved performance and increasingly

exacting operating conditions. The great majority of these demands are met by some combination of clever design of

'conventional' bearing systems, the development of improved liquid lubricants for a great diversity of specialized

applications, and the devising of effective sealing techniques for circumstances in which it is essential to minimize the

leakage of lubricant liquids or their vapors.

However, in a growing number of applications it is becoming necessary to achieve a result which is either technically

or economically impracticable with conventional lubricants. Numerous alternative classes of bearing systems have

en

been devised to meet new requirements by means which are tailored to like circumstances. For example, in a

vacuum, a magnetic support may be employed (for low temperatures); for handling almost any liquid, the liquid itself

may be used as a lubricant although it may lack numerous convenient qualities available with lubricating oils; and for

numerous special purposes, including some very high temperature applications, solid lubricants such as graphite, or

molybdenum or tungsten disulfide, may be employed. Another alternative class of bearings is that which makes use

of a gas (air) as the lubricant. Air lubrication offers certain unique advantages, as in their own manner and place do

the other alternatives, but likewise air bearings themselves have their own inherent limitations which must be clearly

recognized in advance if the aspiring user is to avoid unwarranted failure.

In particular it must be recognized that air bearings of practically every type are somewhat more prone to instability

difficulties than are liquid bearings, although most of these instabilities are to a huge extent the same general type

that occur in liquid-lubricated systems; for example, the important case of half-speed whirl in self-acting 360 degree

journal. Pressurized bearings also have their instability problems although these are sometimes of a very different

type.

Classes of Air Bearings

Air bearings fall into two main classes, which indeed correspond to the two major representative classes in liquid film

lubricated bearings: aerostatic bearings, which require a feed of pressurized air for their operation, and aerodynamic

bearings, which generate their own internal pressure differentials. The latter generate this pressure by the action of

simultaneously shearing and squeezing the environmental gas between the surfaces in relative motion, whereas the

former require an external pump to produce the pressure. Both these types of bearing can be employed to sustain

either axial or radial loads in rotating systems (or direct loads in linear configurations), or to combine the functions in a

single member. A bearing can operate either entirely aerostatically or entirely aerodynamically throughout its

operating speed range, or the bearing can start its movement in one mode of operation and transfer to the other as

the speed changes, or it can operate with a combination of both aerostatic and aerodynamic pressure generation.

Under certain circumstances, moreover, it may be necessary to supply externally pressurized gas to a self-acting

bearing to prevent instabilities from arising. The flow regime in either type is usually laminar, but turbulent flow

conditions can occur.

In general, the externally pressurized bearings (aerostatic), for many purposes suffer an inherent disadvantage

through requiring a pressure source and an exhaust sink; but they can be made to relaxed manufacturing tolerances

and can provide support at low speeds, and sustain intermittent or stationary loads. The self-acting bearings

(aerodynamic), on the other hand, are able only to support a few pounds per square inch of bearing area depending

upon the speed, require careful manufacture and alignment and are only suitable for bearings whose surfaces are

always moving when under load. However, such bearings do not require auxiliary equipment and there is no problem

of disposing of the exhaust gas or arranging for appropriate pressure control of the working compartment. The

pressure gas for the externally pressurized type may, however, offer special advantages in particular circumstances.

For example, a pressure-fed bearing can work in a dust-laden atmosphere because the exhaust air prevents the

entry of solid particles from the environment.

Despite some limitations of load carrying capacity compared to other mechanical or rolling element bearings there are

numerous advantages, and some of them exclusive, that permit machine operation in conditions which would

otherwise be quite impracticable.

Exclusive Advantages of Air Bearings

The advantages which air lubrication can offer stem from the properties of gases: first, they are chemically stable

over a wide temperature range and second they have inherently low viscosities. However, even in this category it is

often practical to design an alternative device by a fundamentally different approach to the same job without air

bearings, and so it is really not feasible to draw a hard line between exclusive advantages and advantages of degree.

Nevertheless, it is believed that this way of thinking of the advantages available does avoid some confusion of

thought since it focuses attention upon aspects of a proposed application in which the gas really may be doing

something which no other lubricant could possibly do for fundamental reasons and those in which there is merely

competition in regard to convenience or cost.

Low Friction

Of the more important exclusive advantages which are offered by air lubrication are those cases where the low

viscosity of gases as compared with liquids can be exploited to special benefit. Particularly straightforward examples

of this class of application are those which occur in near-static apparatus such as gimbal support, dynamometers,

wind-tunnel balances and other specialized mechanical instruments which benefit from the extremely low static

frictional torque which externally pressurized bearings can offer. The use of a gas permits a torque orders of

magnitude smaller than could be achieved by liquids, but perhaps in practice often of more importance is the fact that

a low-torque bearing with an appropriately large operating clearance can be made in a very simple and clean fashion

using gas lubrication. Air is usually employed, since the exhaust from the bearing can be released to the

surroundings and quite large flow rates can be employed.

In semiconductor machine tools, high-speed, acceleration and damping are key to product throughput. The use of air

bearings in such an application has found widespread use. Experimental high speed linear slides of a composite

lightweight structure have operated at 14g acceleration for thousands of hours or repeated because of the low friction

aspects of air bearings. A mechanical rolling element-type bearing would never be able to satisfy such a requirement.

This low friction also finds uses in torque measuring equipment, dynamic balancing machinery, semiconductor

positioning systems, micro or zero gravity trajectory simulators and other instruments requiring near-static conditions.

High Accuracy

The high accuracy of motion that can be obtained with air bearings is equally important in some applications.

Considerable differences in motion accuracy exist between rolling element bearing supports and air bearing supports.

In linear slides, for example, rolling element bearings witness noise error (or rumbling) due to the ways' surface

roughness and/or eccentric rotation of the rollers or balls.

On the contrary, air bearings do not suffer from this difficulty. The reason for this lies in the absence of surface

contact between the bearing parts and the averaging action of the air film over the various local surface irregularities

present in the machined surfaces. Even the finest of rolling element bearings are orders of the magnitude less

accurate than air bearings. In rotating air bearings, this effect produces high orders of rotational accuracy and

smoothness of travel. Typical T.I.R. for air bearing spindles are less than 1.0 µinch. For linear slides, pitch, roll and

yaw errors of much less than a fraction of an arc second are attainable and straightness of travel errors on the order

of nanometers have been achieved.

High Stiffness

At zero speed, air bearings provide considerably high stiffness characteristics. This same effect is seen at zero or low

loads. For properly designed and manufactured aerostatic bearings, it is not uncommon to measure stiffness on the

order of several million pounds per inch.

Zero Wear

The advantage of zero wear can be seen greatly in externally pressurized or aerostatic bearings and to some large

degree in self-acting or aerodynamic bearings. Although some properly designed rolling element bearings can

achieve practical wear rates, none can match the zero wear characteristic of aerostatic bearings. With aerodynamic

bearings, starting and stopping causes some rubbing within the bearing clearance, but this can be alleviated by

introducing a pulse of air just as the bearing begins translation. Furthermore, as compared with rolling element

bearings, air bearings do not suffer from increased wear rates as the speed or load is increased. With proper care

and maintenance, infinite life can be expected from air bearings.

Note on crash resistance: allowing a bearing to crash or be overloaded to the grounded state should never be a

design feature.  Crashed bearings are a sign of a much wider system problem and should be corrected regardless of

the type of bearing used.  

Contamination

Gas lubrication has found a place of particular importance in circumstances where it is necessary to keep the

environment free from contamination by conventional lubricants. Such situations arise in semiconductor wafer

handling systems. In these situations, it may be costly or impractical to manufacture a system which can effectively

seal off contaminants from oil lubricants used in roller slides. The externally pressurized air bearing lends itself well to

harsh environments where liquids, dust and contaminants are present. The air bearing's great resilience stems from

the fact that with positive pressure existing inside the bearing, all foreign matter is repelled away from the critical

bearing surfaces. Externally pressurized bearings could operate while completely submerged in a liquid. Unlike some

rolling element bearing supports that require periodic maintenance, cleaning, the addition of oil lubricants and

sometimes the replacement or re-surfacing of guide ways, the air bearing's self-cleaning nature allows it to be

virtually maintenance-free.

Wide Temperature Range

Perhaps the most exclusive quality of gases as lubricants is their potential for operation over extremely wide ranges

of temperature. Indeed, it is the invulnerability of the solid components of the machine, not that of the lubricant, which

will set performance limits when simple gases are used for high temperature lubricated applications, although at the

lower end of the temperature scale condensation of the gas may become a limitation. Complex gases on the other

hand will have decomposition limitations at the upper end of their usable temperature range. No difficulty is seen, for

example, at the hot end end of the scale, in operating the bearings of small steam turbines or circulators upon

superheated steam, and, at the cold end, gases approaching their liquefaction temperatures could be employed to

lubricate the bearings of, for instance, gas liquefying turbines. In both examples considerable simplification of design

could thus be achieved in some situations. It is noted that whereas with liquids bearing performance falls off with rise

of temperature due to fall in viscosity, in the case of gases, the load-carrying performance will in general improve due

to a rise in viscosity.

Externally pressurized ceramic bearings were operated at temperatures of up to 1,500°F (800°C) at speeds of up to

65,000 rev/min. Low temperature applications of air bearings have been largely confined to various types of

expansion turbine gas liquefiers and to refrigeration plant. A small high-speed expansion turbine for liquefying helium

can operate at 350,000 rev/min. This unit employs bearings which are lubricated by helium gas at a temperature

between 50° and 13°K, and the output of liquid helium is maintained at a pre-selected temperature of between 3° and

4°K to an accuracy of 0.05°.

Technical Articles

Introduction to Air Bearings Aerostatic Bearings Aerodynamic Bearings Metrology Design Calculation Information

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Air BearingsCompanies - 205

Air Bearings

ASHOKA MACHORD

Greater Noida

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Ashoka technologies supplying and manufacturing cement plant that includes separators, ball mills, air slides, packing equipment, steel rolling mills, trunion bearings, cement plants with vertical shaft kilns, rotary kiln cement plants and mill headers.

About Us View Products View Video

Send EnquiryAddress:  D- 62-67, Epip Site- V, Kasna, Greater Noida, Uttar Pradesh - 201 301, IndiaMobile / Cell Phone:  +(91)-9810296963Website:  http://www.millgears.com/industrial-machineries.html

Star Newstar Bearing & Automotive Co. Delhi

Reputed exporter & importer of tn series polymide cage bearings,air condition,air compressor bearing series and air bearings. Send EnquiryAddress: No. 1/1068, Bara Bazar, Kashmere Gate, Delhi, Delhi - 110 006, IndiaPhone:  +(91)-(11)-23915454 / 23967135   Fax:  +(91)-(11)-23932782Mobile / Cell Phone:  +(91)-9811008007 / 9312606648Website: http://www.indiamart.com/starmnrbearing/automotive-bearings.html

Track & Tracto Kolkata

We are manufacturer of air filters, loader spare parts, excavator buckets, mechanical bearings etc.

Send EnquiryAddress: No. 5, Khairu Place, Near Chandani Chowk, Metro Station, Kolkata, West Bengal - 700 072, IndiaPhone:  +(91)-(33)-22116496 / 22112896Mobile / Cell Phone:  +(91)-9831733179 / 9433402573Website: http://www.indiamart.com/track-tracto/earthmoving-equipment-parts.html

Shri Ram Engineers Rajkot

Manufacturer and supplier of shipping spare parts which include compressor spares, refrigeration compressor spares and air compressor spares including crankshafts, piston assemblies, bushes, bearings, liners, connecting rods and valve plates.Send EnquiryAddress: Shri Ram Estate, Gondal Road, Outside Railway Crossing, Opposite Shivalik - 4, Rajkot, Gujarat - 360 004, IndiaPhone:  +(91)-(281)-2360530 / 2368362   Fax:  +(91)-(281)-2360414 / 2380310Mobile / Cell Phone:  +(91)-9974041892Website: http://www.indiamart.com/srengineers/engine-generator-parts.html

System Engineering Works

Nashik

Established in 1999 we are a leading manufacturer of high frequency drilling spindles, air bearing spindles & from India.Send EnquiryAddress: W-160, M. I. D. C. Ambad, Nashik, Maharashtra - 422 010, IndiaPhone:  +(91)-(253)-6614185Mobile / Cell Phone:  +(91)-8007865449 / 9762005449Website: http://www.systemengg.net/high-frequency-spindles.html

Air & Gas Compressor Spares (india) Private Limited New Delhi

Manufacturing and exporting bearings, bearings assembles, designed bearings, aluminium bearings, iron bearings. Also engaged in air compressor pump, pneumatic air compressor, air compressor spare parts, air cooled heat exchanger etc.Send EnquiryAddress: E-10-12, Triveni Complex, Jawahar Park, Laxmi Nagar, New Delhi, Delhi - 110 092, IndiaPhone:  +(91)-(120)-2897304 / 2897306 / 2897276   Fax:  +(91)-(120)-4134182Mobile / Cell Phone:  +(91)-8802234555Website: http://www.compressor-spares-manufacturer.com/

Dhruman Engineering Company Mumbai

Offering compressor spares, compressor parts, compressor valve plates, compressor oil pumps, refrigeration compressor spares, air compressor spares, compressor bearing, compressor gasket, gasket sets, compressor piston pins, compressor piston, oil filters

Send EnquiryAddress: No. 26, 29- B, 2nd Floor, Navalkar Building, Kennedy Bridge, Opera House, Mumbai, Maharashtra - 400 004, IndiaPhone:  +(91)-(22)-65002410   Fax:  +(91)-(22)-66367141Mobile / Cell Phone:  +(91)-9867682233 / 9322236170Website: http://www.indiamart.com/dhrumanengg/compressor-spares.html

Kay Iron Works (Jorian) Private Limited Yamunanagar

Deals in supplying of cement plant that includes industrial cement plants, cement making plants, cement plant with grinding units, cement plant with mill bearings and air lifted cement plant.

Send EnquiryAddress: Radaur Road, Opposite Power House Jorian, Yamunanagar, Yamunanagar, Haryana - 135 001, IndiaPhone:  +(91)-(1732)-203163 / 203164   Fax:  +(91)-(1732)-203169Mobile / Cell Phone:  +(91)-9896000622 / 9896000458Website: http://www.kayironjorian.com/

Industrial Compressor Component Mumbai

Engaged in manufacturing compressor spares, air compressor spares and refrigeration compressor spares including piston assemblies, valve plates, connecting rods, liners, bearings, bushes and crankshafts.

Send EnquiryAddress: Gala no.B-1, aeka Apartment, Rani Sati Marg, Malad (E), Mumbai, Maharashtra - 400 097, IndiaPhone:  +(91)-(22)-40214595   Fax:  +(91)-(22)-28769485Mobile / Cell Phone:  +(91)-9819821666 / 9320520201Website: http://www.industrialcompressorcomponent.com/compressor-spares.html

Janak Enterprises Thane

Engaged in manufacturing and supplying of air bearing spindles that includes electric air bearing spindles, pipe cutting machine,tube cutting machine,bar cutting machine,tube end facing machinehigh frequency air bearing spindles and automatic air bearing

Send EnquiryAddress: Vadkun, College Road, Dahanu Road, Thane, Maharashtra - 401 602, IndiaPhone:  +(91)-(2528)-222463 / 654952 / 223970   Fax:  +(91)-(2528)-222463Mobile / Cell Phone:  +(91)-9975669481 / 8087337171Website: http://www.indiamart.com/janakenterprises/industrial-machines.html

Shree Technologies Mumbai

Wholesaler & trader of pigment ink & epson pigment ink, brother photo ciss ink, silky pigment ink, hp-27-28-22-21-818-852-air removal stand. Also deals in bearings & bearing assemblies, gears, gear boxes, gear shafts, parts & related products.

Send EnquiryAddress: No. 71/73, 1st Floor, Office No-1 A, Bazar Gate Street, Opposite V. T. Station, Mumbai, Maharashtra - 400 001, IndiaPhone:  +(91)-(22)-22692020 / 40025224 / 66105224   Fax:  +(91)-(22)-22692020Mobile / Cell Phone:  +(91)-9892218963 / 9821929426Website: http://www.shreecartridge.com/printer-products-accessories.html

M. T. Ind Mark Fans Private Limited Pune

Manufacturer & supplier of air bearings, air cooled bearings. Also offering bearing, bearing assemblies, water cooled pillow block, air cooled bearings, air cooled bearings and water cooled pillow block.

Send EnquiryAddress: No. 001, Raghukul Nagri - 38, Aundh Road, Bopodi, Pune, Maharashtra - 411 020, IndiaPhone:  +(91)-(20)-25823252Mobile / Cell Phone:  +(91)-9011063750Website: http://www.indiamart.com/mt-indmark-fans/fan-accessories.html

Mehta Brothers Mumbai

We are a company of 10 employees, offering bearing. We also offering power tools, hand tools, cutting and threading tools, fasteners, bearings, v-belt, grinding wheel and measuring instrument.

Send EnquiryAddress: B-3, Kailash Explande, Opposite Shreyash Cinema, L. B. S Marg, Ghatkopar West, Mumbai, Maharashtra - 400 086, IndiaPhone:  +(91)-(22)-25002020 / 25001393   Fax:  +(91)-(22)-25001393

Mobile / Cell Phone:  +(91)-9820092052Website: http://www.indiamart.com/mehta-brother/automotive.html

Mayur Bearing Center Vadodara Trader of air bearings.Send EnquiryAddress: Amul Building, Laheripura New Road, Vadodara, Gujarat - 390 001, IndiaPhone:  +(91)-(265)-2438880 / 2438880Mobile / Cell Phone:  +(91)-9428766377 / 9428766378Website: http://www.indiamart.com/company/3977285/

Matru Enterprise Vadodara Engaged in production of air bearings, ball bearings and plain ball bearings.Send EnquiryAddress: No. 856- 4, G I D C, Makarpura, Vadodara, Gujarat - 390 010, IndiaPhone:  +(91)-(265)-2633164   Fax:  +(91)-(265)-2633162Website: http://www.indiamart.com/company/835628/

Jai Krishi Udyog Shamli Deals in exporting and manufacturing air bearings, ball bearings and plain ball bearings.Send EnquiryAddress: Muzaffarnagar Road, Shamli, Uttar Pradesh - 247 776, IndiaPhone:  +(91)-(1398)-250039 / 253263   Fax:  +(91)-(1398)-253263Mobile / Cell Phone:  +(91)-9758203922Website: http://www.indiamart.com/company/834668/

Vijaya Auto Products Bengaluru Manufacturer of air bearings.Send EnquiryAddress: 89, Near Bangalore Press, Mysore Road., Bengaluru, Karnataka - 560018, IndiaPhone:  +(91)-(80)-41313609 / 25502238Mobile / Cell Phone:  +(91)-9886767891Website: http://www.indiamart.com/company/3037234/

S. D. Industries Ahmedabad Our product range includes graphite bearing. We are leading manufacturer of air bearings from India.Send EnquiryAddress: A/17, Chinai Baug Industrial Estate, Near Water Tank, Behind Bank Of Baroda, Dhudheshwar, Ahmedabad, Gujarat - 380 004, IndiaPhone:  +(91)-(79)-25620778 / 25620788   Fax:  +(91)-(79)-25621364Mobile / Cell Phone:  +(91)-9898369786 / 9898569786Website: http://www.indiamart.com/sd-industries/graphite-bearings.html

Padmasons Mumbai Engaged in manufacturing and exporting of air bearings.Send EnquiryAddress: 14-15 Commercial Chambers, 1st Floor 179 Yusuf Meherali Road, Mumbai, Maharashtra - 400003, IndiaPhone:  +(91)-(22)-23466699   Fax:  +(91)-(22)-23466699Mobile / Cell Phone:  +(91)-9820970777Website: http://www.indiamart.com/padmasons-bearings/

Hi Tech Transpower Private Limited Rajkot Dealers of air bearings, automotive bearings and ball bearings.Send EnquiryAddress: 10, Navarangpara, Mavdi Plot Opp. Prima Product, Rajkot, Gujarat - 360004, IndiaPhone:  +(91)-(281)-2368376Website: http://www.indiamart.com/company/840848/

Multi Dimensions Mumbai Selling and exporting air bearings, ball bearings, linear motion bearings and polymer bearings.Send EnquiryAddress: E/19, Lijjat Godavari Socty, M. G. Road Kandivli West, Mumbai, Maharashtra - 400 067, IndiaPhone:  +(91)-(22)-32924154   Fax:  +(91)-(22)-27897304Mobile / Cell Phone:  +(91)-9821217472Website: http://www.indiamart.com/company/818201/

Machaero Company Private Limited Bengaluru Manufacturer of air bearings.Send EnquiryAddress: Veerapura Village, Doddadallatur Area, Bengaluru, Karnataka - 561 203, IndiaMobile / Cell Phone:  +(91)-9972092501Website: http://www.indiamart.com/company/4649801/

Jei Bearings, Rajkot Rajkot Exporters and manufactures air bearings like taper roller bearings, needle roller bearings, ball bearings, spherical roller bearings, cylindrical roller bearings, clutch bearings, clutch release bearings, four point contact bearings, etc.Send EnquiryAddress: Plot No. 138-141, Vavdi Survey No. 43/1, Near Akash Marble Behind Perfect Auto, Gondal Road, Rajkot, Gujarat - 360 004, IndiaPhone:  +(91)-(281)-2370110   Fax:  +(91)-(281)-2370157Mobile / Cell Phone:  +(91)-9824228157Website: http://www.indiamart.com/jei-bearings/

Global Bimetal Rajkot Engaged in manufacturing and selling air bearings, ball bearings and industrial bearings.Send EnquiryAddress: 102, Amrut Comm. Center Sardarnagar Main Road, Rajkot, Gujarat - 360 001, IndiaPhone:  +(91)-(281)-2465427   Fax:  +(91)-(281)-2464328Mobile / Cell Phone:  +(91)-9825481607

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