McGill Metric CAMROL Cam Follower Bearings

METRIC CAMROL BEARINGSMETRIC CAMROL BearingsMcGill offers METRIC CAMROL Bearings in metricdimensions equivalent to the ISO standard series. BothEuropean and Asian versions are available.Yoke TypeStud TypeThe dimensional tables list the Basic Dynamic (C) and Basic Static (Co) Load Ratings as calculated by the ISO andABMA standards. Also listed are the dynamic and staticratings for the CAMROL Bearings operating as track rollers.These dynamic and static ratings are less than those calculated by the basic load rating formulas (C and Co) andaccount for the additional bending stresses present because the outer ring is unsupported. The load applied onthe bearing while it is operating dynamically should notexceed 50% of the dynamic rating as a track roller.Standard Features: Outer rings with a large radial cross section towithstand bending stresses that result from heavyrolling or shock loads. Black oxide finish on all exposed surfaces helpsprevent corrosion. All bearings are available with a cylindrical outsidediameter or the standard 500mm crown radius. Integral studs on MCF, MCFR and MCFD cam followers are designed for cantilever mounting. Extendedend of the inner stud has metric threads. The screwdriver slot (or optional broach slot) on the flange isused to hold the stud stationary while tightening thenuts during mounting. Metric stud type cam followers include two metric nutsand a lubrication fitting. The second nut serves as alocknut. (See page 2.) Metric cam yoke roller bearings have endplatessecured by a liquid metal injection process. Providesup to 10 times the holding force on endplates, improved roundness of the assembled bearing andsignificantly less assembled stress of the inner ring.McGill METRIC CAMROL Bearings are available withthree types of internal construction: full complementneedle rollers, retainer type needle rollers or cylindricalrollers.MCYRD SERIESYOKE TYPESeries MCYRD — Shielded, full complement of cylindrical rollersWI(3)WRORIBRDEBearing LifeStatistical L10 bearing fatigue life can be calculated according to the following formula:Where:BDRPNL10McGill METRIC CAMROL Bearings are available in studor yoke type versions. Specifying the yoke type or studtype bearing will depend on the preference for either astraddle (yoke) mounting or a cantilever (overhung)mounting.METRIC CAMROL BEARINGS MCYRDBORE DIA.B BEARINGNO.Basic Dynamic Rating (Newtons)Radial Load (Newtons)Speed (RPM)Fatigue Life (Hours)MAX.MIN.ROLLERDIA.RDRD(1)W. RDIA.EMIN.RoRiNOM.500mm CROWN RADIUSLOAD RATING (NEWTONS)ISO LOADRATINGLOAD RATINGAS TRACK 3231.751.10.65189000130000640007100016000.816The following should be considered in mounting CAMROLBearings: The housing that supports the cam follower stud (or theshaft on which the cam yoke roller is mounted) shouldbe of sufficient strength to resist excessive deformationunder the expected applied load. The face of the housing should be flat and square withthe housing bore, and must have a diameter of at leastthat listed in the dimensional tables for proper support ofthe bearing endplate. In order to obtain the best support for the CAMROLBearing, the chamfer on the housing bore should notexceed 0.5 mm x 45o. When mounting stud type CAMROL Bearings in a machine member, the radial lubrication hole (it is in linewith the McGill name) should be located in the unloadedportion of the raceway. Any pressure required for installation should be appliedagainst the solid center portion of the flanged inner stud(not on the flange perimeter), and the cam followershould be drawn up tightly by the nut so the bearingendplate is securely backed up. Precaution should be taken to avoid excessive torquewhen tightening the clamping nut; otherwise unduestress may be set up in the stud. The clamping nut should not be tightened beyond themaximum clamping torque listed in the 303231.751.10.66099000156000710007700013000.950To determine the basic dynamic rating required for agiven application, use the following formula:BDR .054 x P x (L10 x N).3-(1)(2)3)Standard bearing has a crowned roller outside diameter. For straight cylindrical outside diameter, add suffix "X". (Example - MCYRD-15-X)Since load, lubrication method, temperature and other factors affect the maximum operating speed, it is impossible to determine precise limiting speed. The listedlimiting speeds are based on lightly loaded bearings having adequate lubrication and are listed only as a design guide. If grease lubricated, frequent relubricationis required. Actual bearing testing in the specific application should be conducted if the anticipated operating speed approaches the listed limiting speed.Positive clamping across endplates required to insure proper end play after mounting.Tolerance limits for roller diameterCrowned Roller Dia. "RD"Cylindrical Roller Dia. "RD"RD (NOM.)RD -0.00930500-0.01150800-0.013801200-0.015Load RatingsThe basic load rating or basic dynamic rating, as defined by ABMA and ISO, is that calculated, constant radial load which 90% of a group of apparently identicalbearings with stationary outer ring can theoretically endure for a rating life of 1,000,000 revolutions (33 1/3 rpmfor 500 hours). The basic load rating is a referencevalue only, the base value of 1,000,000 revolutions cho4 sen for ease of calculation.13

METRIC CAMROL BEARINGSMETRIC CAMROL BEARINGS MCFD SERIESSTUD TYPELSeries MCFD — Shielded, full complement of cylindrical rollersWESLTLHCHDRD DSDDCR500mm CROWN RADIUS Yoke type CAMROL Bearings should be mountedwith the lubrication hole in the unloaded portion of theraceway and according to the recommended shaftdimensions listed in the tabular data. When a tight fit of the bearing on a shaft is desired,an ISO j6 shaft tolerance should be employed. Forheavily loaded applications, the bearing should beclamped endwise and mounted on a high strengthshaft with an ISO j6 tolerance. If the bearing cannot be clamped endwise, it isessential to have a close axial fit in the yoke in whichthe bearing is mounted to prevent axial displacementof the endplates under THREADLENGTHTLTLTHREADREAMEDHOLEDOIL SPEED(2)GREASEHOUSING BOREDIA.OILLOAD RATING (NEWTONS)ISO LOADRATINGmmLOAD RATINGAS TRACK 1)(2)(3)Standard bearing has a crowned roller outside diameter. For straight cylindrical outside diameter, add suffix "X". (Example - MCFD-35-X)Since load, lubrication method, temperature and other factors affect the maximum operating speed, it is impossible to determine precise limiting speed. The listed limitingspeeds are based on lightly loaded bearings having adequate lubrication and are listed only as a design guide. If grease lubricated, frequent relubrication is required.Actual bearing testing in the specific application should be conducted if the anticipated operating speed approaches the listed limiting speed.Clamping torque is based on dry threads. If threads are lubricated, use half of value shown.Tolerance limits forCylindrical Roller Dia. "RD"RD (NOM.)12ENDPLATEEXTENSIONEROLLERWIDTHW 0.00-0.12Tolerance limits forStud Dia. "SD"Tolerance limits forCrowned Roller Dia. "RD"RD (NOM.)TOLERANCETOLERANCESD 00-0.015All McGill CAMROL Bearings are supplied prelubricatedwith a high grade lithium base grease having an operating temperature range of -29oC to 120oC (-20oF to 248 oF) and frequent relubrication is suggested forcontinuous rotating applications.Provision for Relubrication - Stud TypeStud type CAMROL Bearings have provision forrelubrication either through the end of the inner stud orthrough a cross drilled hole in the stud shank.Sizes up through 19mm OD do not have an axial holefrom the threaded end, and no cross drill hole is presentin the stud shank on sizes through 26mm OD. Thecounterbored ends of the axial holes are designed to accept a press-fitted type metric lubrication fitting. Closingplugs are supplied so that the unused axial hole orholes can be sealed. If the cross-drilled hole is notused for relubrication, it should be covered by the housing; therefore, no plug is supplied for this hole.Provision for Relubrication - Yoke TypeYoke type CAMROL Bearings have a lubrication hole inthe inner ring bore so relubrication can be accomplishedthrough a cross-drilled hole in the supporting shaft if desired.Track DesignSince cam followers or cam yoke rollers are merely onecomponent of a two-piece bearing construction, alongwith the track or cam on which it operates, proper selection of the track or cam material must be considered.This selection has a direct effect upon ultimate life andperformance of the cam roll application.Where bearings are used as support or guide rollers, itis often difficult to obtain high hardness and tensilestrength values for the machine members against whichthe bearings operate. In the interest of economy, relatively soft structural materials can be applied in most applications where dimensional accuracy is not extremelycritical. The work hardening of ferrous, low carbon trackmaterials, accompanied by relatively small amountsof wear-in of the bearing into the track surface, generallyresults in satisfactory bearing performance. In the application of cam follower or cam yoke roller bearings (lifttruck mast rollers, for instance), it is common to employformed structural steel sections as bearing track supportmembers, and the wearing-in and work hardening of thetrack surface generally results in a satisfactory bearingapplication, providing loads are not excessive.Cam DesignCam applications are similar in many respects to track orsupport roller applications, except that bearing speedsare higher due to the multiplication of cam revolutions perminute by the ratio of the cam OD to the cam followerOD. Because of these higher speeds, oil lubrication ispreferred, but where such lubrication methods are notpossible, grease should be replaced frequently.In the application of box or drum cams, it is possible toobtain differential rotation of the cam follower outer raceas well as associated load reversals. This may result inexcessive wear of cams or cam followers unless propercam hardness and materials are employed, as well asample lubrication. In box cams of this nature, the camrise and cam fall should be watched closely, since theload reversal encountered can cause shock loads in excess of the capacity of the stud or bearing.The same precaution applies to ordinary circular cams.Instantaneous loads due to rapid cam rise should becarefully calculated and kept below the ultimate strengthof the follower and the stud.In ordinary cam design it is possible to employ the mostefficient materials for best resistance to fatigue andbrinelling, and attainment of high track surfacehardnesses associated with good wear resistance is quitefeasible. The same general precautions concerning tensile strength, as listed under track design above, shouldbe followed for cam design; applications involving highmarginal bearing or cam loading should be referred to theMcGill Engineering Department.Track CapacityTrack capacity of all cam follower and cam yoke rollerbearings is the load which a steel track of a given tensilestrength will withstand continuously without deformationor brinelling. Table II lists track capacities for steel tracksfor the standard crowned roller outside diameter versions.For the straight cylindrical roller outside diameter versions (“-X” suffix), multiply by 1.25 to obtain the track capacity ratings.To obtain track capacities for track hardnesses other thanRockwell “C” scale 40 (tensile strength 1242 MPa), multiply track capacity by track capacity factor listed in Table I.Regardless of track capacity, dynamic load should not exceed 50% of basic dynamic rating as a track roller andstatic load should not exceed maximum static rating as atrack roller.Table I - Track Tensile StrengthMPaTrack HardnessRockwell "C"Track .7752.0902.4202.7805

METRIC CAMROL BEARINGS Table II - Track 1300CAMROL Bearing Application EngineeringFrom an application standpoint, cam follower and camyoke roller-type bearings may be mounted interchangeably. The selection depends upon the mounting preference: Straddle or yoke mounting — requires the use of acam yoke roller bearing Cantilever or overhung mounting — requires use ofthe stud mounted cam followerIn general, heavier loads can be supported by the camyoke roller bearing where the yoke mounting arrangement is possible — since the problem of stud deflectionis eliminated, and the ultimate shear strength of the pinon which the cam yoke bearing is mounted becomes thegoverning factor from a load-carrying standpoint. Inmost cases, the cam follower construction is preferredbecause of its simpler mounting: the user needs only todrill and ream a suitable mounting hole in the supporthousing. Both cam followers and cam yoke rollers offer alow-cost, readily available, easily mounted bearing forfollower arms, guide rollers, table support bearings andmany other applications — involving either linear movement or the translation of rotary motion to axial motion.Due to the accuracy of manufacture, bearings can easilybe mounted in multiples, providing hole locations aremaintained for table support rollers with resultant adequate load sharing properties. Where greater accuracyis required, it is possible to select catalog bearings tocloser control limits; and where accuracy of mounting isneeded, it is possible to mount the cam follower stud inan auxiliary eccentric collar, which in turn is mounted inthe support member. With this modification, the ultimatein accurate load sharing capabilities is gained in multiplebearing arrangements.LOADNTIOMOLOADYoke MountingONTIMOLOADTrack or load support rollersto provide anti-friction linearmotion.Track guide rollers — to insurefree and accurate lateral location during linear motion.LOADIn the application of cam yoke roller bearings, severalmounting arrangements are possible, and three of theseare shown above for MCYR bearings. These mountingsare straight-forward and show the bearings clampedendwise in each case. It is possible to apply bearings ofthis type without resorting to endwise clamping; howeverendwise clearance over the end plate should be controlled closely to avoid disassembly of the bearing.METRIC CAMROL BEARINGSMCYR SERIES W1WRRDEBMCYRR-S500mm RADIUSMOUNTING BER(1)SHAFT DIAMETERLOOSE FIT FOR LIGHTLOADSg6g6LIGHT TRANSITION FITFOR MEDIUM LOADSh6h6LIMITING IN.mmmmmmmmmmrpmrpmLOAD RATINGSISO/ABMA BASICLOAD RATINGSNEWTONSDYNAMICSTATICTRACK ROLLERLOAD 80000.9600.984(3)(4)(5)For a tight fit and heavy loads, use ISO tolerance j6.Since load, lubrication method, temperature and other factors affect the maximum operating speed, it is impossible to determine precise limiting speed. The listedlimiting speeds are based on lightly loaded bearings having adequate lubrication and are listed only as a design guide. If grease lubricated, frequent relubricationis required. Actual bearing testing in the specific application should be conducted if the anticipated operating speed approaches the listed limiting speed.Dynamic load should not exceed 50% of Dynamic Rating as a track roller.MOTIONMOTIONExternal cam applications —precise, anti-friction translation of motion.6LOADInternal cam applications.11

METRIC CAMROL BEARINGSMETRIC CAMROL BEARINGS Hex Hole CAMROL BearingsMCYR SERIESCoding for metric CAMROL BearingsW1YOKE TYPEWRSeries MCYR — Unsealed, full complementSeries MCYR-S — Sealed, full complementSeries MCYRR — Unsealed, cage typeSeries MCYRR-S — Sealed, cage typeRDStud TypeBEMetric stud type CAMROL Bearings are available with ahexagonal hole in the face of the stud in place of thescrewdriver slot. This feature is advantageous formounting bearings in blind holes or with self-lockingnuts requiring greater-than-average thread torque. Inthis modification, relubrication through the flange end ofthe stud is not possible.MCYR500mm RADIUSBEARING BER(1)BORE D

Bearing, invented by McGill over 60 years ago CAMROL is the trademark for the line of roller bearing cam followers manufactured by McGill and de-signed for use as cam followers and track rollers. The CAMROL Cam Follower Bearing was originally in-vented by McGill over 60 years ago. Since then, McGill has maintained its leading position through the