Transcription
Barden Super Precision Ball BearingsSpeciality Products
Table of ContentsCapabilitiesSpecial ApplicationsCommitted to Excellence. 4Introduction & Capabilities. 43Solid Lubrication. 72Mounting and Fitting. 120Global Reach. 4Vacuum Pumps. 44Bearing Cages. 73 – 77Shaft & Housing Fits. 121Barden’s Products. 5Emergency Touchdown/Auxiliary Bearings. 45Bearing Closures. 78 – 79Fitting Practice. 121Precision Standards. 5Medical and Dental - High Speed. 46 – 47Dental Handpiece BearingsAttainable Speeds & Limiting Speed Factors. 80Fitting Notes. 122 – 123Beyond ABEC. 6Medical and Dental - X-Ray. 48 – 49Internal Design Parameters. 81Shaft & Housing Size Determination. 123 – 124Sizes and Configurations. 6Aviation and Defense – Auxiliary. 50 – 51EquipmentBall Complement. 81Maximum Fillet Radii. 124Raceway Curvature. 81Shaft & Housing Shoulder Diameters. 125Radial Internal Clearance. 81 – 83Abutment Tables. 126 – 134Contact Angle. 84 – 85Random and Selective Fitting. 135Axial Play. 86 – 87Calibration. 135 – 136Ball Complement (Tables). 88 – 90Maintaining Bearing Cleanliness. 137 – 138Preloading. 91 – 95Handling Guidelines. 139Lubrication. 96 – 103Index. 140Applications. 7Quality Management. 8Product Engineering. 9Bearing TypesDeep Groove Bearings. 10Angular Contact Bearings. 11Nomenclature. 12 – 13Product TablesDeep Groove Instrument (Inch). 14 – 17Aviation and Defense – . 52 – 53Instrumentation and SensingAviation and Defense – Actuation. 54 – 55SystemsCanning Industry. 56Nuclear Power. 57Emerging Automotive Technologies. 58 – 59Thrust Washers. 60EngineeringBearing SelectionSelecting the Right Bearing. 64Operating Conditions. 64Deep Groove Instrument (Metric). 18 – 19Bearing Types. 65Deep Groove Flanged (Inch). 20 – 21Diameter Series. 66Deep Groove Thin Section (Inch). 22 – 25Sizes and Materials. 66Thin Section (Inch). 26 – 27Ball & Ring Materials. 66 – 67Deep Groove Spindle and Turbine. 28 – 33(Metric)Angular Contact (Inch). 34 – 35Angular Contact (Metric). 36 – 412Bearing ApplicationTolerances and Geometric Accuracy. 104 – 105Tolerance Tables. 106 – 109Bearing PerformanceBearing Life. 110Service Life. 110Bearing Capacity. 110 – 111Fatigue Life. 112 – 115Grease Life. 116Ceramic Hybrid Bearings. 68 – 70Vibration. 117X-life Ultra Bearings. 70Yield Stiffness. 118Surface Engineering Technology. 71 – 72Torque. 118Measurement and Testing. 118 – 1193
CapabilitiesPrecision with VisionCommitted to ExcellenceGlobal ReachBarden’s ProductsPrecision StandardsThe Barden Corporation is recognized as a worldleader in the design and manufacture of superprecision ball bearings. For more than six decadesthe Barden name has been synonymous withbearings of exceptional quality and precision andBarden bearings are renowned worldwide for theirhigh reliability and long operating life inchallenging applications.Originally founded in 1942 by Theodore Barthand Carl Norden in the United States, TheBarden Corporation has built an enviablereputation for producing some of the world’smost precise bearings and is now a key strategicmember of the multinational Schaeffler Group.The Group specializes in bearing technologiesand precision products for aerospace, industrialplant and automotive industries and has over74,000 employees at more than 180 locationsworldwide.The Barden product line is comprised largely ofradial, single and double row, angular contact(separable and non-separable) and deep groove,super precision ball bearings. All products in therange can meet and will usually exceed ABEC 9(ISO P2) standards, while full traceability back toraw materials can also be provided.Precision ball bearings are manufactured totolerance standards defined by the Annular BearingEngineering Committee (ABEC) of the AmericanBearing Manufacturers Association (ABMA). Thesestandards are accepted by the American NationalStandards Institute (ANSI) and can be seen asbroadly equivalent standards for the InternationalOrganization for Standardization (ISO).Barden offers thousands of bearing variationswhich are used in virtually every sector of industrywhere there is the need to meet critical tolerances,high speeds and performance under demandingoperating conditions. These include keycomponents for the aerospace and defensesectors, vacuum pumps, food processing,robotics and medical equipment, includingx-ray and CAT scanners and high speed dentalhandpiece turbines.Barden’s success has been built on a solidfoundation of manufacturing and engineeringdesign expertise, a highly skilled workforce andthe ability to design bespoke engineered solutionsfor its customers.The Barden Corporation boasts state-of-the-artfacilities at its manufacturing plants in Danbury,USA and Plymouth, UK, both of which havesome of the world’s most sophisticated machinetools, production equipment and inspectionsystems installed. As a supplier to some of themost prolific blue chip companies across theglobe, quality is of the utmost importancethroughout the organization. Stringentstandards are applied to every element of thebusiness, from the customer interface anddesign, through to production, packagingand delivery.Barden’s product offering also includes large andsmall diameter thin section ball bearings. Producedin standard cross sections and configurations,these bearings can be customised to meet theunique needs of each application.ISOStandardM&I ABECStandardM&I ISOStandard1P03P63PP65P55PP5A7P47PP4A9P29PP2ABEC standards define tolerances for several majorbearing dimensions and characteristics, which aredivided into envelope dimensions (bore, OD andwidth) and bearing geometry. Bores and OD’s maybe calibrated for greater mounting flexibility.Barden super precision bearings come in inch ormetric dimensions with diameters ranging from4mm (5/32") OD up to 300mm (11½") OD. A varietyof seals, shields and metallic/non-metallic cagedesigns are available to meet most requirements.Many Barden bearings operate comfortably atspeeds reaching 2 million dN (bore in mm x RPM),or above.4ABECStandardBarden encompassesspecialist product lines,including large and smalldiameter thin sectionbearings, dental bearings,spindle and turbinebearings, turbomolecularpump and machine toolbearings. While generalpurpose bearings for theseranges are manufacturedto ABEC 1 through to ABEC9 standards commercially,Barden bearings of thesetypes meet or exceed ABEC 7 geometric standards.Additionally, Barden’s ‘miniature and instrument’product range is produced in equivalent classeswith added refinements designated by suffixes,and are comparable to ABEC 7 or above.5
CapabilitiesPrecision with VisionBeyond ABECSizesApplicationsABEC classes are primarily concerned with bearingBarden’s super precision bearings are availablein metric or inch dimensions, with diametersranging from 1.5mm (0.06'') bore diameter to300mm (11½'') OD, and can be categorized aseither ‘miniature and instrument’ or ‘spindle andturbine’. This categorization is primarily related tosize, however the application can sometimes beused to classify the bearing.Complementing Barden’s range of standardproducts are a range of re-engineered, modifiedand custom-designed bearings, created to customerspecifications. Often designed around a particularapplication, these ‘special’ bearings offer userssomething new in terms of precision, size orconfiguration. Examples of Barden bearingapplications include:Configurations VACUUM PUMPS. TURBOMOLECULAR PUMPS. DRY PUMPS.tolerances and while very helpful in categorizingprecision, there are many other factors that affectthe suitability of a bearing to its application.Total bearing quality and ‘fitness for purpose’ incritical applications is of major importance andBarden often maintains closer tolerances thanspecified. There are several factors affecting bearingperformance and life which are not covered by ABECstandards and these are addressed during thedesign and manufacture of all Barden bearings.For example, ABEC criteria does not includefunctional testing of assembled bearings,yet this measure can be extremely important.Barden applies self-established standards,using proprietary tests and measuring equipmentto ensure the delivery of quiet, smooth-runningbearings that will perform exceptionally well.Bearing design is also omitted from ABECclassification but can make the difference betweensuccess and failure in bearing use. Barden offersa flexible and innovative design service for thispurpose, which takes into account all the factorslikely to impact on an application. As such, aBarden bearing may have specific low torquecharacteristics for a gyro gimbal, extra stiffnessfor a textile spindle, or extremely high reliabilityfor an aerospace accessory application. Becauseball quality affects the running smoothness of abearing, Barden uses both steel and ceramic ballsproduced to its own exacting specifications forball geometry, finish and size control.6Barden manufactures deep groove and angularcontact (separable and non-separable) bearings,available with a wide variety of seals, shields,speciality lubricants, metallic and non-metalliccage designs and calibration options. Thanks toan innovative design service, Barden productscan incorporate bespoke design features, such asdirect lubricant injection slots, fixings and flanges.Flanged bearings are especially useful in throughbored housings. The inboard side of the flangeprovides an accurate positioning surface forbearing alignment, eliminating a need for housingshoulders or shoulder rings.Barden products are available in a range of materialsto suit all applications, including SAE 52100carbon chrome steel, AISI 440C, AISI M50 andCronidur 30 , a high nitrogen steel originallydeveloped for critical aerospace applicationsDesign innovation has led to the developmentof extra wide, or cartridge width, deep groovebearings which are available in Series 9000 forapplications requiring extended operation withoutlubrication. These bearings offer more interior freevolume and can therefore hold more grease.Furthermore, improved lubricant life in extreme orhostile environments and increased speedabiltycan be offered through the use of ceramic balls.The benefits of hybrid bearings over traditionalsteel ball bearings are well known and all Bardenproducts can be fitted with ceramic balls.Vacuum pumps place severe demands on precisionbearings, which must operate reliably under extremeconditions and meet long life requirementsThe precision bearings in CAT scanner x-ray tubes usea special Barden bearing design which must operatein a vacuum under boundary lubrication conditions TOUCHDOWN BEARINGS. MEDICAL. DENTAL HANDPIECE TURBINES. X-RAY TUBES. AVIATION & DEFENSE. AUXILIARY EQUIPMENT. INSTRUMENTATION & SENSING. ACTUATION SYSTEMS. NUCLEAR POWER. EMERGING AUTOMOTIVE TECHNOLOGIES.Barden bearings are an integral part of dental drilldesign, where high speeds, reliable performance andlow maintenance are critical Canning Industry.Commercial aviation applications include a widevariety of aircraft accessories and critical components,and comprise a large percentage of Barden’s corebusinessThe Barden super precision bearings used in theInternational Space Station must meet stringentperformance requirements with minimal lubrication7
CapabilitiesQuality ManagementBarden’s Quality Management Systems areaccredited to Aerospace Standard AS9100. Inaddition, we are able to satisfy specific customerrequirements such as The National Aerospaceand Defense Contractors Accreditation Program(NADCAP) for our heat treatment and non-destructivetesting processes; and to satisfy regulatoryrequirements imposed by the Federal AviationAdministration (FAA) and European Aviation SafetyAgency (EASA). These controls are coupled with aplanned flexibility which enables Barden to complywith specific requirements of individual customersthrough a system of bespoke quality levels andformal certification of our products.Product EngineeringSimilarly, our “Approved Supplier” programmeensures that our suppliers are also in line with ourexpectations, consistently supplying us withquality products.If standard catalogue bearings lack the necessarycharacteristics for a particular application, ourProduct Engineering Department can designa special bearing to meet your requirement,whether this is a change of material for extremeenvironments, changes to theinternal design or modifiedinterface dimensions.Quality is fundamental to all Barden productsand services. Our philosophy of “zero defects”is applied to every aspect of our business; fromcustomer service, through design and procurement;and onto manufacturing, assembly and postdelivery support. We place strong emphasis on“quality planning” using preventive tools such asFailure Mode and Effects Analysis (FMEA) for ourdesign and manufacturing processes.Our Quality and Manufacturing Engineering staffdetermine and monitor the capabilities of ourmeasurement systems and production machinesrespectively; thereby ensuring that manufacturingtolerances can be achieved. In-process machinecontrol is facilitated using pre-control; and thesestatistical methods are employed as productiontools to gain better and more consistent quality.We also provide continual investment in businessimprovement techniques such as Six-Sigma andlean manufacturing at both local and corporatelevels.Each lot of parts or assembled bearings mustconform to defined quality requirements beforebeing allowed to move to the next operation.Barden’s operators are certified through vigoroustraining and auditing to perform inspectionoperations during the manufacturing process.8Barden Product Engineering services are availableto all customers and prospective users of Bardenproducts. Our engineers and technicians havecapabilities in every area of bearing design,application, testing and development. Whenbearing performance involving torque, vibration orstiffness is an issue, they can perform computeranalysis of characteristics and requirements inorder to determine a suitable bearing design.The Metrology Department of Barden’s qualitycontrol organization provides basic standards ofreference, using many advanced types ofinstrumentation. All linear measurements arecertified and traceable back to National Standards.Similarly, our Metallurgical and ChemicalLaboratories provide routine verification ofincoming bearing steel, lubricants, cage materialand other supplies. These laboratories work closelywith external providers, universities andestablishments to ensure continual developmentof our products and processes.Schaeffler Group, Barden can also draw on theadditional global experience of Schaeffler’s R&Dfunctions.Our Product Development Laboratories conductinvestigations into new materials, coatings,lubricants and bearing designs. These laboratoriesare the center for Barden’s work on unusualbearing problems, special environmental testingand vibration analysis. Endurance and reliabilitytesting is also performed here.If you have a particular problem that you would likeBarden’s engineers to review, please contact yourlocal Schaeffler sales company or an AuthorizedBarden Distributor.With over 60 years ofspecialization in the fieldof precision ball bearings,Barden engineers can drawupon a wealth of technicalinformation to aid in failureanalysis or troubleshootingof performance problems.They can readily identify thecontributing causes andrecommend solutions toimprove bearing performanceor useful life. As part of theAll these aspects are echoed in Barden’s QualityManagement principles of continual improvement;zero defects and customer satisfaction.9
Bearing TypesH typeDeep Groove BearingsDeep groove ball bearings have full shoulders onboth sides of the raceways of the inner and outerrings. They can accept radial loads, thrust loadsin either direction, or a combination of loads.The full shoulders and the cages used in deepgroove bearings make them suitable for theaddition of closures. Besides single deep groovebearings with closures, Barden also offers duplexpairs with seals or shields on the outboard faces.Deep groove bearings are available in many sizes,with a variety of cage types. Their versatility makesthem the most widely used type.Ceramic (silicon nitride) balls can be specified toincrease bearing stiffness, reduce vibration levelsand prolong life.Deep groove bearings can also be supplied with afull complement of balls as a filler notch design. Infiller notch bearings the inner and outer ring havenotches which when aligned, allow balls to beloaded directly in to the raceway. Whilst this allowsfor full complement, these bearings are typicallysuited to radial loads.10Flanged bearings provide solid mounting for goodaxial control and eliminate the need for housingshoulders or shoulder rings. Housings can bethrough-bored to reduce manufacturing costs andsimplify assembly. When flanged bearings areused, the housing mounting surfaces must beaccurately machined to properly position andsupport the bearings.Flanged bearings are recommended when housingdesigns cannot accommodate full bearing width, orwhere the quality of the housing bore is a concern.Non-Separable Type (H): Inner ring hasfull shoulders, outer has one shouldercut away with a small retaining lip atthe edge of the raceway.J typeB typeNon-Separable Type (J): Outer ringhas full shoulders, inner ring has oneshoulder cut away with a small retaininglip at the edge of the raceway.Separable Type (B): Outer ring has fullshoulders, inner ring has one shouldercut away. The inner ring is removablefor mounting on the shaft separatelyfrom the outer ring assembly.Angular Contact BearingsAngular contact bearings have one ring shoulderremoved, either from the inner or outer ring.This allows a larger ball complement than foundin comparable deep groove bearings, giving agreater load capacity. Speed capacity of angularcontact bearings is also greater.Barden angular contact bearings have a nominalcontact angle ranging from 10 to 25 . They canbe used in pre-loaded duplex sets, back to back(DB) or face to face (DF) for supporting thrustloads in both directions or in tandem (DT) foradditional capacity.Contact angles are obtained by assembling thebearings to the appropriate radial play values.The smaller contact angles give better radialcapacity and rigidity while the higher contactangles give higher axial capacity and rigidity.Angular contact bearings support thrust loadsor combinations of radial and thrust loading.They can not accept radial loads alone – a thrustload of sufficient magnitude must be applied.A single angular contact bearing can be loaded inone thrust direction only, this may be an operatingload or pre-load.Separable and non-separable types are available.Separable bearings are useful where bearingsmust be installed in blind holes or where pressfits are required on the shaft and in the housing.The separable feature also permits dynamicbalancing of the rotating components with theinner ring mounted in place without the outerring and housing.As with deep groove bearings, angular contactbearings can also be supplied with a full complementof balls and no retainer. Full complement angularcontact bearings are designated by ‘X205’ in thenomenclature and are typically suited to axiallyloaded applications.11
Nomenclature2. Series and SizeTypeSR4EXAMPLES1. MaterialSpecial processes3. Bearing TypeR2C30XRInch seriesinstrumentCCeramic ballsR10030XX-Life Ultra RingsInch seriesminiatureMAISI M50 ringsand ballsAAISI 440C ringsand balls (500Series)BCBarrier coatingPTCP coating ofrings and ballsVDenotes ABEC 5Tfor torque tubeand extra thinseriesR1000 Inch series extrathin500N50030100No symbol indicates SAE52100 rings and ballsOther materials areavailable on requestPages 66 – 6720030019009000FRInch series torquetubeInch series torquetube - narrowwidthMetric seriesspindle andturbineMetric seriesspindle andturbineMetric seriesspindle andturbineMetric seriesspindle andturbineMetric seriesspindle andturbineMetric series S&Tcartridge widthInch seriesinstrumentflangedFR100 Inch series7. Radial Play8. Bore OD ToleranceFunctional TestSSWX8K5VKTWide inner ring,instrumentRW100 Wide inner ring,miniatureSpecial bearingsZSpecial bearingSCBSpecial customerbearing3DLDeep GrooveDeep GrooveDeep Groove(None)SSingle shieldWSSDouble shieldStainless steel2 piece ribbonloosely clinchedASingle noncontact BarshieldTAReinforcedphenolic, onepiece snapDeep grooveAngular ContactBSeparable,relieved inner ringESeparable,relieved outer ringHJNon-separable,relieved outer ringNon-separable,relieved inner ring10. Radial RunoutDB5AADouble noncontact BarshieldFSingle FlexealFFDouble FlexealUSingle SynchroSealUUPages 10 – 11ZAPTFE hollowcylindersTBBartemp onepiece snap selflubricatingTDouble SynchroSealYSingle BarsealYYDouble BarsealVVDouble VitonBarsealPPDouble PolyacrylicBarsealRSSingle shieldfitted into plainside of flangedbearingNo symbol indicates anopen bearingTMT(B)(H)Nylon one piecesnapReinforcedphenolic, onepiece, designedto retain the ballsin the outer ringReinforcedphenolic, onepiece, halo design(H)JBBronze machinedhalo, lightweight design foroptimum capacity(H)JHBronze machinedhalo, heaviersection centeredon ball pitchdiameter(J)JJBronze pressedhalo with formedpocketsAngular contactConsult Barden ProductEngineering Dept.Phenolic/aluminum 2 piecemachined andrivetedAngular Contactminiature flangedRW9. DuplexingH00M00 Metric seriesinstrument6. Special FeaturesFF38AISI 440C ringsand balls5. CagesH104S4. ClosuresPages 78 – 79XSpecific specialfeature codeYSpecific specialfeature codeX200Oil tight sealbetween shieldand outer ringrecessX204Customer partnumber markedon bearingsX205Full of balls (nocage)X212Ship rings & ballsunassembled (nocage required)X216Shield and snapwires shippeddisassembledDeep GrooveKSeparatingsymbol23456See pages 84 – 85for standard radialplay tables forvarious sizes andtypes of 0011''-0.0017''(0.028mm-0.043mm)VLow torqueassuredVKVery low startingtorque assuredVMVery low runningtorque assuredVTIndividual torquetrace supplied toVM limitsDeep grooveDBBack to backmountingDFFace to facemountingDTTandem mountingDUniversalmountingXXxx is the meanpreload specifiedin poundsPage 119Angular ContactRadial play in angularcontact bearings is usuallystandardized by the designDBBack to backmountingDFFace to facemountingPages 82 – 83DTTandem mountingDUniversalmountingDSSingle UniversalmountingLLight PreloadMMedium PreloadHHeavy PreloadO-11EG-33R2O-49RInner ring markedfor high point ofradial runoutOuter ring markedfor high point ofradial runoutBoth rings markedfor high point ofradial runoutCC44CXOC4XPage 105Angular ContactCG-2Special radialrunoutR212. LubricationEER111. CalibrationCMBore and ODin 0.0001''(0.0025mm) stepsO-OilOJ-OilBore and ODin 0.00005''(0.00125mm)stepsG-GreaseGJ-GreaseBore onlycalibratedin 0.0001''(0.0025mm) stepsFrequently used oilsBore calibrated in0.00005'' steps,OD calibrated in0.0001" stepsBore calibrated in1 microns stepsO-11WinsorlubeL-245XO-28Mobil Spectrasyn6O-49Exxon Turbo Oil2380OJ-201 Aeroshell Fluid 12OJ-273 Nye Nyosil M25Pages 135 – 136Frequently used greasesG-2Exxon Beacon 325G-33Mobil Grease 28G-44Castrol Braycote601 EFGJ-204 Aeroshell Grease7GJ-264 Kluber Asonic GHY72Pages 96 – 103Pages 92 – 95( ) indicates that theletter is already includedin the nomenclature fromsection 3Pages 74 – 77See product tables,pages 14 – 411213
Deep Groove Instrument (Inch)Bore Diameters: 1.191mm to 4.762mm Open, shielded and sealed Tolerances to ABEC 7P (see pages 108 to 111 )BoreDiameterOutsideDiameterMaximumShaft/Housing RadiusWhich BearingCorner WillClearWidthBasicBearingNumberdDBnd2r Max.BsAttainable Speeds (RPM) by Cage OptionPage 76 – 77Bearing NomenclatureStatic CapacityBasicDynamicLoadRatingTA Cage**StandardSnap In Cage**RadialThrustCo (lbs)To (lbs)C (lbs)OpenShieldedFlexeal2-PieceRibbon X20.1250SR2A*Also available with extended inner ring.1445,000**Attainable speed is determined by cage, not lubricant type. Also available with T-Cage option. Available only with single shield.†††15
Deep Groove Instrument (Inch)Bore Diameters: 4.762mm to 15.875mm Open, shielded and sealed Tolerances to ABEC 7P (see pages 108 to g RadiusWhich BearingCorner WillClearWidthBasicBearingNumberdDBnd2r Max.BsAttainable Speeds (RPM) by Cage OptionPage 76 – 77Bearing NomenclatureStatic CapacityBasicDynamicLoadRatingTA Cage**StandardSnap In Cage**RadialThrustCo (lbs)To (lbs)C ,000105,000SR4AS
ball quality affects the running smoothness of a bearing, Barden uses both steel and ceramic balls produced to its own exacting specifications for ball geometry, finish and size control. Sizes Barden’s super precision bearings are available in metric or inch dimensions, wi
