cages for angular contact gothic arch or fractured race ball bearings description machined one-piece kv km design material laminated paper or linen phenolic max speed-dn 1,500,000 operating temp max 300°f comments can be impregnated with oil high speed quiet running moderate speed general purpose quiet running high speed thin cross section good strength very high speed strength typical applications spindles and high speed motors molded one-piece mn nylon with fiber reinforcement 750,000 300°f motors textile spindles machined one-piece mx bronze 1,500,000 500°f power transmission aircraft accessories aircraft accessories high speed transmissions pump actuator accessory gearbox gearboxes machined one-piece m2 steel with silver plate 3,000,000 900°f mp mq one-piece machined inner or outer land piloted with ball retention b5 b6 s3 s4 bronze 1,000,000 350°f good strength moderate speed high speed strength very high speed &strength silicon-iron bronze steel with silver plate 2,000,000 500°
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roller bearing features nhbb manufactures cylindrical roller bearings in a wide range of designs and configurations the tables on this page illustrate some typical specifications please contact your hitech sales and engineering groups to discuss specific requirements for your application flat length gage point roller bearing rings corner crown drop features guide flanges standard roller diameter length 5mm examples crown drop min .0001 flat length min max min max .050 .130 .300 .540 .030.040 corner .012.018 finish-cla layback angle tolerance runout roller end clearance tolerance roller paths finish-cla 10 1° .0003 .0010 max .0003 22mm min .00070 max .00096 8 .000050 .0003 straightness wall thickness variation cage/roller retention comparison cage style method of manufacture control of roller drop reuse after disassembly ndt inspection manufacturing complexity roll peened prior to assembly cage is roll peened to create retention yields a relatively high
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engineering radial play axial play and contact angle ball bearings most ball bearings are assembled in such a way that a slight amount of looseness exists between balls and raceways this looseness is referred to as radial play and axial play specifically radial play is the maximum distance that one bearing ring can be displaced with respect to the other in a direction perpendicular to the bearing axis when the bearing is in an unmounted state axial play or end play is the maximum relative displacement between the two rings of an unmounted ball bearing in the direction parallel to the bearing axis since radial play and axial play are both consequences of the internal geometry of the components in a ball bearing they bear a mutual dependence the contact angle is the angle between a plane perpendicular to the ball bearing axis and a line joining the two points where the ball makes contact with the inner and outer raceways the initial contact angle of the bearing is directly related to rad
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engineering lubrication bearing lubrication reduces friction and wear acts as a coolant minimizes contamination prevents corrosion and generally extends bearing life selecting the best lubricant for your specific application becomes a very important decision however choosing from the hundreds available can be an overwhelming task nhbb s engineering staff is available to help make the right choice for your application lubricant is undesirable or impossible generally a grease can take higher loads and higher temperatures than an oil all of the oil types mentioned in this section can be used as grease bases to which are added metallic soaps synthetic fillers and thickeners the operative properties of grease depend almost wholly on the base oil solid film oil oil is the basic lubricant for ball and roller bearings the main advantage of an oil lubricant is that there is less bearing torque the use of synthetic oils such as diesters silicone polymers and fluorinated compounds has improved vo
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lubrication lubrication nhbb code lo1 brand name windsor lube l-245x anderol l-401d krytox 143ac type diester synthetic oil diester synthetic oil fluorinated oil military specification mil-l-6085 operating temp max -65°f to 250°f general comments light general purpose instrument oil low volatility light general purpose instrument oil low volatility high temperature stability lo2 mil-l-6085 -65°f to 250°f ly115 -30°f to 550°f lg20 beacon 325 diester synthetic grease petroleum grease -65°f to 250°f nonchanneling general purpose grease nlgi 2 channeling smooth running long life with minimum migration nlgi 4 high speed high temp specialty lube spindle instrument and aircraft bearings nlgi 2 nonchanneling wide temperature range good low temp torque aircraft general purpose nlgi 2 nonchanneling wide temperature range good low temp torque aircraft general purpose nlgi 2 general purpose low volatility nlgi 2 high temperature stability nlgi 2 wide temperature range vacuum applications nlgi 2 wi
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load ratings and bearing life the load ratings in this catalog are based on ansi/abma standards 9 and 11 these standards specify the accepted methods for calculating load ratings and fatigue life of ball and cylindrical roller bearings since a multitude of variables may affect these calculations they should be used for baseline estimates only load ratings for your application s specific operating conditions should be calculated before making a final bearing choice rating life the rating life l10 of a group of apparently identical bearings is the life in millions of revolutions that 90 percent of the group will meet or exceed for a single bearing l10 also refers to the life associated with 90 percent reliability the life which 50 percent of the group of bearings will meet or exceed median life or l50 is usually not greater than five times the rating life the calculation of rating life involves many parameters and is based on historical test data estimated rating life can best be dete
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engineering load ratings and bearing life material factors certain materials have proven to have greater fatigue life than others operating under identical conditions the theoretical l10 dynamic life is based on air-melt steel and standard abma formulas the life-adjustment factors for materials frequently used are shown below other life adjustments the conventional rating life often has to be modified as a consequence of application abnormalities whether they be intentional or unknown seldom are loads ideally applied the following conditions all have the practical effect of modifying the ideal theoretical rating life l10 life adjustment factors for material material factor a vibration and/or shock-impact loads b angular misalignment c high speed d operating at elevated temperatures m50 52100 vim/var 52100 cevm 440c modified 52100 440c 10 7 5 3 1 .8 nhbb can provide reliable bearing life estimates based on semi-empirical data to assist in accurately forecasting bearing life 44
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testing materials laboratory engineering test laboratory nhbb maintains a fully equipped engineering test laboratory to test and confirm the performance characteristics of bearing designs thermal testing of materials and lubricants is done using both refrigeration and high temperature input to the test bearings since significant rotational speed is a critical element in many of our customers applications nhbb uses high speed test spindles to evaluate bearing attributes such as design material lubrication etc and their effect on performance and life bearing fatigue and load carrying capability is evaluated on an ongoing basis on endurance test rigs both continuous rotation and oscillation tests are performed under pre-established load conditions testing of bearings in customer provided equipment provides the most realistic test conditions nhbb engineers coordinate these tests with our customers to insure testing conditions are at least as demanding as the true application environment
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temperature conversion table the numbers in the center column refer to the temperatures either in celsius or fahrenheit which need conversion to the other scale when conver ting from fahrenheit to celsius the equivalent temperature will be found to the left of the center column if converting from celsius to fahrenheit the answer will be found to the right celsius to fahrenheit conversion table °c -79 -73 -68 -62 -57 -51 -46 -40 -34 -29 -23 -17.7 -17.2 -16.6 -16.1 -15.5 -15.0 -14.4 -13.9 -13.3 -12.7 -12.2 -6.6 -1.1 4.4 9.9 15.6 21.0 26.8 32.1 °f/°c -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 °f -166 -148 -130 -112 -94 -76 -58 -40 -22 -4 14 32 33.8 35.6 37.4 39.2 41.0 42.8 44.6 46.4 48.2 50.5 68 86 104 122 140 158 176 194 °c 37.7 43 49 54 60 65 71 76 83 88 93 99 104 110 115 121 127 132 138 143 149 154 160 165 171 177 182 188 193 199 °f/°c 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 35
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engineering inch/metric conversion table example to look up the inch equivalent of 15mm find 10 on the horizontal axis and 5 on the vertical axis their intersection is the inch equivalent 15mm .59055 inch 1 inch 25.4mm millimeters to inches mm 0 1 2 3 4 5 6 7 8 9 mm 0 1 2 3 4 5 6 7 8 9 mm 0 1 2 3 4 5 6 7 8 9 mm 0 1 2 3 4 5 6 7 8 9 0 0.00000 0.03937 0.07874 0.11811 0.15748 0.19685 0.23622 0.27559 0.31496 0.35433 10 0.39370 0.43307 0.47244 0.51181 0.55118 0.59055 0.62992 0.66929 0.70866 0.74803 20 0.78740 0.82677 0.86614 0.90551 0.94488 0.98425 1.02362 1.06299 1.10236 1.14173 30 1.18110 1.22047 1.25984 1.29921 1.33858 1.37795 1.41732 1.45669 1.49606 1.53543 40 1.57480 1.61417 1.65354 1.69291 1.73228 1.77165 1.81102 1.85039 1.88976 1.92913 50 1.96850 2.00787 2.04724 2.08661 2.12598 2.16535 2.20472 2.24409 2.28346 2.32283 60 2.36220 2.40157 2.44094 2.48031 2.51969 2.55906 2.59843 2.63780 2.67717 2.71654 70 2.75591 2.79528 2.83465 2.87402 2.91339 2.95276 2.99213 3.03150 3.07087 3.11024 80
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inch/metric conversion table fractional to decimal conversions fraction inch 1/64 1/32 3/64 1/16 5/64 decimal inch 0.01563 0.03125 0.04688 0.06250 0.07813 decimal mm 0.3969 0.7938 1.1906 1.5875 1.9844 fraction inch 3/8 13/32 7/16 15/32 1/2 decimal inch 0.37500 0.40625 0.43750 0.46875 0.50000 decimal mm 9.5250 10.3188 11.1125 11.9063 12.7000 3/32 7/64 1/8 9/64 5/32 0.09375 0.10938 0.12500 0.14063 0.15625 2.3813 2.7781 3.1750 3.5719 3.9688 17/32 9/16 19/32 5/8 11/16 0.53125 0.56250 0.59375 0.62500 0.68750 13.4937 14.2875 15.0812 15.8750 17.4625 11/64 3/16 13/64 7/32 15/64 0.17188 0.18750 0.20313 0.21875 0.23438 4.3656 4.7625 5.1594 5.5562 5.9531 3/4 13/16 7/8 15/16 1 0.75000 0.81250 0.87500 0.93750 1.00000 19.0500 20.6375 22.2250 23.8125 25.4000 1/4 17/64 9/32 5/16 11/32 0.25000 0.26563 0.28125 0.31250 0.34375 6.3500 6.7469 7.1438 7.9375 8.7313 1-1/16 1-1/8 1-3/16 1-1/4 1-5/16 1.06250 1.12500 1.18750 1.25000 1.31250 26.9875 28.5750 30.1625 31.7500 33.3375 49
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