Extra Light 2MM9100WI and 3MM9100WI Series ...

1 Superprecision BearingsNomenclatureIntroduction .. 58-59 Ultra Light 2MM9300WI .. 60 Extra Light MM9100K Series .. 61 Extra Light 2MM9100WI and 3MM9100WI Series .. 62 Extra Light 2MM9100WO Series .. 63 Extra Light 2 MMV99100WN and 3 MMV99100WN Series .. 64 Light MM200K Series .. 65 Light 2MM200WI and 3MM200WI Series .. 66 Medium MM300K, 2MM300WI and 3MM300WI Series .. 67HX Series .. 68 Ceramic Hybrid Bearings .. 69 Ball Screw Support Series .. 70 Load Ratings .. 71 Shaft and Housing Diameters (Ball Screw Bearings) .. 72 Shaft and Housing Shoulder Dimensions(Ball Screw Bearings) .. 73 BSBU D Series .. 74 BSBU Q Series .. 75 BSPB D Series .. 76 BSPB Q Series .. 77Ex-Cell-O Spindle Bearings .. 78-80 PageSuperprecision Ball BearingsH,R,J,P internal fit( P fit is standard in Conrad Bearings)Contact Angle:2=15 3=25 HybridCeramicSeries:9300 ultra light9100 Extra light99100extra light200 light300 mediumBore Size:(04 and up,multiply theselast two numbersby 5 to get borein millimeters:)0010mm0112mm0215mm0317mm042 0mman exampleof a specif-icationnumber forother thanstandardPreload.

2 Universal Flush GroundSUX single bearing, ultra lightSUL single bearing, lightSUM single bearing, mediumSUH single bearing, heavyDUX duplex pairs of bearings, ultra lightDUL duplex pairs of bearings, lightDUM duplex pairs of bearings, mediumDUH duplex pairs of bearings, heavyTUX triplex set of bearings, ultra lightTUL triplex set of bearings, lightTUM triplex set of bearings, mediumTUH triplex set of bearings, heavyQUX quadruplex set of bearings, ultra lightQUL quadruplex set of bearings, lightQUM quadruplex set of bearings, mediumQUH quadruplex set of bearings, heavy2 MMC9104 WICRDULA3188 Retainer: No retainer callout impliesFafnir standardPRBmolded nylon cagePRCmolded reinforced nylon cagePRF, PRGspecial high performance materialMBRmachined bronze cageSMBR machined silicon-iron-bronze cageCRcomposition cage (non-metallic)Level of Precision:MMsuperprecision ABEC-7 MMVsuper high precision (HG) between ABEC-7and ABEC-9 MMXultraprecision ABEC9 Construction:KConradWIangular contact; low shoulder on outer ringWOangular contact; low shoulder on inner ringWNangular contact; low shoulder on both ringsHXangular contact; low shoulder on both rings58 INTRODUCTIONMEANINGS OF PREFIXES AND SUFFIXESIn the Fafnir numbering system the basic number which denotes the sizeand Series is always retained.

3 When special variations are made as in thecase of precision bearings, prefixes and suffixes are added which havedefinite meanings as follows:PREFIXESMM superprecision ABEC-72MM superprecision ABEC-7 low contact angle-15 3MM superprecision ABEC-7 high contact angle-25 2 MMV high grade (HG) between ABEC-7 and ABEC-9 low contactangle-15 3 MMV high grade (HG) between ABEC-7 and ABEC-9 high contactangle-25 MMX ultraprecision ABEC-9 SUFFIXESK deep groove radialWI angular contact-low shoulder on outerWO angular contact-low shoulder on innerWN angular contact-low shoulder on both inner and outerHX angular contact-low shoulder on both inner and outerCR composition cage (non-metallic)MAR machined aluminum cageMBR machined bronze cageMSR machined steel cageSMBR machined silicon-iron-bronze cagePRB molded nylon cagePRC molded nylon cagePRF,PRG special high performance materialDUL flush-ground duplex bearings Light preloadDUM flush-ground duplex bearings medium preloadDUH flush-ground duplex bearings heavy preloadSUL flush-ground single bearing Light preloadSUM flush-ground single bearing medium preloadSUH flush-ground single bearing heavy preloadSUPERPRECISION MM (ABEC-7)

4 Superprecision bearings of the K or non-filling slot construction aregenerally used on woodworking spindles, aircraft accessory units andmachine tool applications where duplex bearings are not a definiterequirement. By virtue of the single row radial deep groove construc-tion and superprecision tolerances, they are capable of carrying thrustloads in either direction and have relatively high-speed popular on precision machine tool spindle applications arethe WI angular-contact type bearing variations, namely 2MM-WI and3MM-WI. Since this bearing type has a low shoulder on outer ring, itcarries thrust in one HIGH PRECISION MMV (HG)Superprecision bearings are manufactured to our new HG toleranceclass, with running accuracy and performance meeting ABEC-9 (ISOP2) while maintaining noncritical features at ABEC-7 (ISO P4) level forcost-effectiveness.

5 Bore and surfaces are coded in micron unitsfor the convenience of the discriminating machine tool builder who isstriving for optimum fitting of all spindle recent development of ceramic rolling elements in highperformance bearings offers the customer the ultimate of speedcapability, high stiffness, long life, low heat generation, and overallsystem reliability. The 99100 Series is available with the option ofceramic ball MMX (ABEC-9)Superprecision bearings with closer tolerances and running accura-cies than ABEC-7 bearings are made to ABEC-9 tolerances. Bearingsproduced to these tolerances are generally made as WO and WNconstruction, and are use on ultra-high speed grinding spindlesdesigned for tight dimensional tolerances and super-fine surfacefinishes.

6 Consult our Engineering Department for TYPESANGULAR-CONTACT BEARINGS2MM-WI types with 15 initial contact angle are designed to meet theneeds of machine builders for precision bearings which will operate atas low a temperature as possible for a wide range of speeds andoperating loads. In order for machines to produce more accurate workat a higher production rate, the bearings must provide a high degreeof rigidity in both axial and radial directions while operating a minimumtemperatures. For example, precision machining or cutting toolsimpose heavier loads on bearings than those encountered in precisiongrinding. In the former, speeds are slower and loads heavier than thelatter, where speeds are high and loads Light .

7 The 2MM-WI type givethe machine builder the flexibility required to meet such variations inapplications. SUPERPRECISION BEARINGS593MM-WI types, manufactured with 25 contact angle, are for use onapplications where the loading on the bearings is predominately thrust anda high degree of axial rigidity is a definite requirement. Typical applications forthese are large vertical rotary surface grinders, horizontal and vertical discgrinders, and thrust bearing applications for heavy duty lathes where thebearings must directly carry extremely high tail stock or chucking types with 15 -18 initial contact angle are designed for extremelyhigh-speed applications where centrifugal force of theballs is the principal load on the bearing.

8 Unlike the MM-WI type which has alow shoulder outer ring, the 2MM-WO type has full shoulders on both sides ofthe outer race and a low shoulder on one side of the inner ring. This designpermits assembly with a maximum complement of balls and a one-piece cagewhich pilots against the precision-ground lands of the outer ring. Generallythis bearing Series is supplied with a separable inner ring and ball retainingcage along with special race geometry for extremely high speed types with 15 initial contact angle are designed to meet the needsof machine manufacturers who require optimum oil flow through the design incorporates a low shoulder on the non-thrust side of both theinner and outer rings. The maximum complement of balls is separated by aone-piece cage which pilots against the ground land of the outer ring.

9 Allproblems involving high-speed bearing applications for which this type isbeing considered should be referred to our Engineering and 3 MMV 99100WN types are available with 15 or 25 contactangle variations and have been developed to operate under the demandingrequirements of high speed machine tools. They incorporate design featureswhich permit operation at higher speed than standard angular contact ballbearings. The bore, outside diameter, and width are the same as theMM9100 Series is designed to operate at rotational speeds 20% greater thanthe MM9100 Series , with no increase in operating temperature. The greatestadvantage of these Series is at speeds greater than 500,000 DN (Bore in mmx RPM). Silicon nitride balls (ceramic) and precision machined ball separatorsare available and, when used, the ultimate performance will be Types are dimensionally interchangeable with equivalent 9100, 99100and ISO Series -10 bearings.

10 These designs enable spindle heads to removemore material in less time while maintaining superior machining bearings come with steel or ceramic ball complements with a 15 degreestandard contact angle in a WN construction Support BearingsTo meet the requirements of the servo-controlled machinery field, Torringtonhas developed a new Series of ball bearings specially designed for ballscrewapplications. Design criteria for these bearings with maximum axial rigidity,low drag torque, and extreme control of lateral bearings are manufactured to ABEC-7 tolerances and are of thenonseparable angular-contact type design with a 60 contact angle andmaximum complement of bearings are supplied prelubricatedwith heavy duty grease NLGI #2.