Sealmaster Mounted Bearing Engineering Guide

1 Application Parameters:Shaft Speed in RPM:Desired Operating Life in Hours: Bearing Loads in Lbs.:Environments:WetRadial:ChemicalThru st:DirtyOtherOperating Temperature:-30 to 200 F *200 to 400 F-100 to -30 F * Bearing Type and Bore:Check Ball and Roller Bearing Pages Bore Size: Bearing Housing Page Seal Pages Selected:Felt SealContact Lock Pages Lock Selected:Single Lock Set ScrewDouble Lock Set ScrewSkwezloc (Ball Bearings Only)BEARINGSELECTIONGUIDE6. Refer to .. Pages 10-13 For Ball Bearing Nomenclature and Pictorial index to locate to .. Pages 96-97 For Roller Bearing Nomenclature and Pictorial index to locate Selected:7. For Application Parameters outside capabilities of selected *Contact Application Engineering (630-898-9620) or you can fax theApplication Worksheet on Page 207 to (630-898-6064).For Ordering Contact Customer Service (800-354-9820) 177 TABLE OF CONTENTSBall Bearing Selection.

2 Pages 178-181 Tapered Roller Bearing Selection ..Pages 182-183 Sample Calculations ..Pages 184-186 Housing Selection ..Pages 187 Seal Selection ..Pages 188-189 Lock Selection ..Pages 190-191 Bearing Basics ..Pages 192-193 Vibration Bearings ..Page 194 Roller Bearings ..Page 195 Lubrication ..Page 196 Recommendations ..Page 197 Fittings ..Page Mounting Procedures ..Page 200 RPB Taper Roller Bearing and Replacement ..Page 203 Recommended Shaft Tolerances ..Page 204 High Speed- High Load Applications ..Page 204 Set Screw and Capscrew Information ..Page 205ER, SC, and ERCI Housing Recommendations .Page 206 Application Worksheet ..Page 207 Refer to Application Section ..Pages 128-143to review a variety of Operational Conditions178 BALL Bearing RATING & SELECTIONB earing Life CalculationWhile both Ball and Roller bearings may be considered as possibledesigns on a given application, the formulas and calculations are differentand will be treated separately.

3 Typically, Ball bearings are usuallyspecified on applications with lighter loads but have a higher speedcapacity. As Ball bearings usually cost less for a given shaft size theyare considered first. If the desired life or load capacity cannot be achievedwith a ball Bearing then a tapered roller Bearing should be considered(see page 182 for Tapered Roller Bearing life calculations). Bearing SYMBOLS FOR LIFE CALCULATIONC - Basic Dynamic Rating (lbs)C0- Static Rating (lbs)P - Equivalent Radial Load (lbs)n - Speed (RPM)L10 - Rated Life (Hours)K - Geometry FactorLna- Adjusted Rated LifeX - Radial FactorFa- Applied Thrust Load (lbs)Y - Thrust FactorFr- Applied Radial Load (lbs)e - Geometry RatioBall Bearing Life CalculationThe following formula provided by the Anti Friction BearingManufacturers Association (ABMA) provide a method for calculatingestimated fatigue life of Ball Bearings.

4 L10 = (C/P)3x 16667nWhere:L10 = The number of hours that 90% of a group of identical bearingsunder ideal conditions will operate at a specific speed and load conditionbefore fatigue failure is expected to = The Basic Dynamic Load Rating in = The equivalent Radial Load in = Shaft speed in , the ABMA provides application factors for Ball Bearingswhich need to be considered to determine an adjusted Rated Life (Lna).Lna = a1 x a2 x a3 x L10 Where:Lna = Adjusted Rated = Reliability factor applied where estimated fatigue life is based onreliability other than 90% (See Table No 1).Table No. 1 Life Adjustment Factor for ReliabilityTable No. 2 Shock/Vibration FactorThe a3 factor takes into account a wide range of application andmounting conditions as well as Bearing features and design. Accuratedetermination of this factor is normally achieved through testing andin-field experience. Sealmaster offers a wide range of options whichcan maximize Bearing performance.

5 Consult SEALMASTERA pplication Engineering for more information. *See samplecalculations on page an initial Bearing size and calculate the expected L10 life. Ifthe life is not acceptable, select another Bearing size as appropriateand recalculate the Lna life. Continue this iterative process until anappropriate Lna life is Load CalculationFor applications where combined radial and thrust loads are presentthe equivalent radial load (P) must be calculated before applying theL10 life For applications with only a radial load present P = FrWhere Fr = Applied radial load in For applications with only a thrust load presentContact Sealmaster Application = Material adjustment for Bearing race material. All Sealmaster Ball bearingraces are manufactured from 52100 Vacuum Degassed Bearing the a2 factor is for all Sealmaster Ball Bearings. It isimportant to check with all manufacturers to ensure that properadjustments are made when other Bearing steels are = Life Adjustment Factor for Operating factor should take into account the adequacy of lubricant, presenceof foreign matter, conditions causing changes in material properties,and unusual loading or mounting conditions.

6 Assuming a properlyselected Bearing having adequate seals and lubricant operating below250 F and tight fitted to the shaft, the a3 factor should be ball bearings are typically slip fitted to the shaft and rely ondesign features such as the inner race length and locking device forsupport. ABMA recommends an a3 factor of .456 for slip fit ballbearings.*Shock and Vibration* Vibration and shock loading can act as anadditional loading to the steady expected applied load. When shockor vibration is present, the following a3, Life Adjustment Factors arerecommended. The shock factor is used in combination with the slipfit (P) equivalent radial Use Table 4 to identify the relative axial load factor (ND2).2. Determine the relative axial load (RAL):RAL =Fa-applied thrust loadND2-relative axial load factor3. Match the nearest relative axial load value in Table #3 to thecorresponding e value.

7 For precise calculation, linearly interpolatethe values for e for your exact relative axial load Calculate Fa/Fr and compare value to the e value found in step#3 Choose values for X and Y based on step #3 & 4 and fromTable No. 3. Linear interpolation is recommended for Calculate equivalent radial load using the following equation:P = XFr + YFa7. Calculate the adjusted life (Lna) using the life calculation to Page 182 for Relevant Bearing RATING & SELECTIONT able No. 4 Load Ratings - Ball BearingsTable No. 3 Equivalent Load CalculationData - Ball Bearings1. For standard and medium duty spherical outerrace inserts as well as AR bearings, match thebearing insert number to the insert number onthe ratings chart ( 2-15, AR-2-15, 2-15D, and2-15T all use 2-15 insert rating.)2. For ER , RB and TXP inserts, match bearinginsert number to ER number ( ER-23 &TXP 23 both use an ER-23 insert rating.)Contact Sealmaster Engineering for of Rating Selection:Ball Bearing Selection -New Applications:Using variations of the life formulasand application information, it ispossible to select bearings basedon desired life, load applied, andshaft speed.

8 This method can beapplied where axial load is lessthan or equal to 1/2 the Determine required applicationhours (Lna).2. Calculate L10 using adjustmentfactors:L10 =Lnaaf x a2 x a33. Calculate Basic Dynamic RadialRating (Creq).4. Use Table No. 4, find a basicDynamic Radial Rating Valuegreater than or equal to Creqcalculated in step # Select any Bearing from the rowin step # 4 or larger. If Creq isgreater than the largest BasicDynamic Radial Rating Value ofTable No. 4, go to Roller BearingSelection on page If Ball Bearing is selected,proceed with housing, seal, lockselection pages operating temperaturerange for standard bearings is -20 to 200 F. For operatingtemperatures outside this rangecontact application Maximum speed information,see tables on pages 180 and = P x( L10 x N )1/3 16,667 YTUDDRADNATSYTUDMUIDEMCISABCIMANYDLAIDAR GNITARCITATSLAIDARGNITAREVITALERLAIXADAO LROTCAF2^DNTSURHTGNITARTFAHSEZIS#TRESNI# RETFAHSEZIS#TRESNI2/161/98/561/114/3mm02 80-290-2010-2110-2210-240258-BR/RE9-RE01 -BR/RE11-RE21-BR/RE402- ee> BALL Bearing RATING TABLESThis chart displays the Goldline Ball Bearing load capacities for a given L10 life, speed, and shaft size.

9 The shaded area indicates themaximum speed ratings for SKWEZLOC and double lock bearings (applicable on sizes available). All speeds listed are for the standard feltseal. See Seal Selection for alternate seals, pages in the table represent loads at ideal conditions with press fit mounting to the shaft. ABMA recommends de-rating of slip fit mountedbearings. To obtain de-rated load, divide the load in the table by Values in the table represent equivalent radial loads only. For combinedload determination, see page 178. Areas designated by - exceed maximum value for standard bearings. Consult Sealmaster ApplicationEngineering for load and speed applications not covered in this Lock and SKWEZLOC use same Bearing insert ratings as single lock inserts shown RB, TX, and ETX inserts use standard duty load ratings for the appropriate shaft Bearing RATING TABLEST able No. 5 Load Ratings - Ball high load-high speed applications, see Engineering section, page operating temperature range for standard bearings is -20 to 200 F.

10 For operating temperatures outside this range contact ##RETFAHSEZISTRESNI#01 LSRUOH0505100500010571000200520053005400 0500550006005600570008000012/161/98/561/ 114/3mm0280-290-2010-2110-2210-240258-RE 9-RE01-RE11-RE21-RE402-RE--0005000010000 3000050000019163853851940939163854041430 7219409307282218109301351218144142375287 1051911013642071441411782822851331601752 4021419115963288103101178822181621601481 2257122130118512071811001979026615117977 9918519012937591451701091718134100148766 1/318/761/51mm521310-2410-2510-250251-24 1-RE51-RE502-RE61-RE--000500001000030000 5000001466526526725814466526334663092725 8140925424918142330324914517436721911618 2123346238145122180354207134141167291225 1821201352102931811395424915314110973288 1031011780323817217015842277132140128312 96171199873129617119987-----61/118/1161/ 31mm03R4/1111-221-231-2602541-171-RE81-R E91-RE602-RE61/511mm52510-31-35035000500 0010000300005000001930187987952845693018 7987627545452845645438340345691506340314 2345134992252002915214682142191284383562 4228711342437320029516935138124816413834 0311287114107349240227163106368289176133 1153872391361921433562481551321433562481 551321-----4/1161/518/31mm5361/7141-251- 261-2702571-202-RE12-RE22-RE702-RE32-REm m0361/31603531-3000500001000030000500000 1092109210921880146809210921598557995880 1468995505104468686574104813717965493333 4626864457738133526365050535924329652543 1346201232551488234239150510487243268198 4883962722081574773262122571364763552512 171---------------2/1161/91mm0481-291-28 02542-RE52-RE802-RE61/71mm5371-370350005 0000100003000050000018361836183611831690 1836183616311859067183169010671469056901 0783069054040192271052245330781969744041 2380814654457389222737579353366246672556 3803542146905353892632126394243882922306 974233082222--------------------8/5161/1 114/31mm54011-2111-2211-2902562-RE72-RE8 2-RE902-RE2/11mm5481-3803500050000100003 0000500000136713671367178410811367136712 2211301818784108118180968450811739056845 5349797779355541637394476155345430780969 7440402377771682416368251776539323336209 6845083023452966135863013642------------ -------------61/3118/7161/511mm05311-241 1-2511-201252-103-RE13-RE012-RE61/1114/3 1mm54111-3211-39035000500001000030000500 0001067106710671584187110671067112219201 7185841871171898674587115399467454348796 7783545406353924751543454386898687430402 3677616724063682417765393133362986745973 023452------------------------------28/1 2mm5561/322-222-2112532-223-RE43-RE112-R E53-RE61/511mm05511-30135000500001000030 0005000001671267126712538175416712671290 5137210101538175410101258676754165112086 7673590219595661655446511819636735624370 1258195894593010120865596427395926782554 4353-----------------------------------1 81 BALL Bearing RATING high load-high speed applications, see Engineering section, page operating temperature range for standard bearings is -20 to 200 F.