LMS Catalog (2018)

Recommendations

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earing technical data assembly practice When installing a bearing onto a tight shaft, force must be applied to the inner ring ONLY. When installing a bearing into a tight housing, force must be applied to the outer ring ONLY. Failure to follow these assembly practices will result in brinelling, causing bearing vibration, noise and a premature bearing failure. fitting practices The tables on the following page can be used as a guide for establishing shaft and housing fits for miniature and instrument bearings when the expansion coefficients of the shaft and the housing are similar or when the operating temperature differential between them is small. If this is not the case, modifications in fits and internal clearance may be required. Considerations 1. A rotating radially pre-loaded bearing is doomed to premature failure. The selected unmounted radial clearance, shaft fit and housing fit must preclude the possibility of mounted radial preload. See item 3 2. “Line to Line” to slightly loose shaft and housing fits are desirable and satisfactory for most general applications. 3. Interference fits may be necessary to prevent one of the bearing rings from turning relative to it mating part while under heavy loads or when high cycle vibration is present. This relative rotation can cause fretting corrosion and wear to the bearing seat. Caution: Interference fits reduce the internal clearance of the bearing by an amount equal to 80% of the diametrical interference and must be compensated for in selecting the internal clearance of the unmounted bearing. 4. One of the rings in the bearing system must be free to move on its mating part to prevent axial pre-loading. 5. The contact angle of a radial bearing under axial load is directly related to the radial play remaining in the bearing after assembly into the system. The higher the assembled radial play, the higher the contact angle. 6. A low contact angle is desirable for pure radial loads. A higher contact angle is desirable when the axial loads predominate. 7. The axial play in a bearing is proportional to the radial play. Higher mounted radial play results in larger axial play. Various means may be employed to reduce axial play in mounted bearings. Contact our Engineering Department for recommendations. 8. If an application requires extreme precision, tight control of fits or where large temperature gradients exist, bore and O. D. classifications or coding may be required. Bearings can be custom manufactured for these applications. 24 <strong>LMS</strong> Bearings • 1751 Panorama Point - Unit A • Lafayette , CO. 80026
shaft and housing fits miniature & instrument shaft fits Operating Conditions Shaft Diameter Average Fit Fit Range Shaft Load Speed A3 A5 A7 A3 A5 A7 A3 A5 A7 Rotating Shaft Stationary Shaft Light Low B -.0002 B -.0004 .0002 L .0000 .0004 L Light High B -.0001 .0001 T .0001 L Medium Low - High B -.0003 .0003 L Heavy Normal High Low-High B -.0000 B -.0002 B -.0002 B -.0004 Line to Line .0002 L .0002 T .0002 L .0000 .0004 L Predominant Radial Load Radial Clearance Range Thrust Load Load Springs P25* P36 - P58 P36 ** P36 P36 - P58 P58 See Rotating Housing B = Nominal Bearing Bore L = Loose Fit T = Tight Fit housing fits Operating Conditions Shaft Diameter Average Fit Fit Range Housing Load Speed A3 A5 A7 A3 A5 A7 A3 A5 A7 Stationary Housing Rotating Housing Light to Heavy Light Medium to Heavy Low to High Low to High Low to High D ± .0002 .0000 .0000 .00025 L .0002 L D -.0000 .0005 L .0004 L D -.0001 D -.0000 .0002 L .0002 L .0005 T Line to Line D -.0003 D -.0002 .0003 T .0002 T D -.0002 D-.0001 .0001 L .0001 L .00015 T .0001 T D-.0004 D-.0003 .0004T .0003 T Predominant Radial Load P36 P36 Radial Clearance Range See Rotating Shaft Thrust Load Load Springs P58 P58 D = Nominal Bearing OD L = Loose Fit T = Tight Fit Light Load - C/P 1500 RPM for bearings with OD’s up to 3/8” Heavy Load - C/P > 15 > 3000 RPM for bearings with OD’s over 3/8” * For closer running accuracy or reduced axial play P13 internal clearance may be used provided that the fit of the outer ring in the housing is line to line or looser ** For closer running accuracy or reduced axial play P25 internal clearance may be used provided that the fit of the outer ring in the housing is line to line or looser. Please consult our Engineering Department for high cycle oscillatory applications and other combinations of load and speed. Tel: (303) 661-0681 • Fax: (303) 661-9811 • www.lmsbearings.com 25
Page 2 and 3: Corporate Overview LMS Bearings Inc
Page 4 and 5: all bearing numbering structure The
Page 6 and 7: miniature and instrument Metric ser
Page 8 and 9: miniature and instrument Metric ser
Page 10 and 11: miniature and instrument Metric fla
Page 12 and 13: miniature and instrument Inch serie
Page 14 and 15: Single Row Radial Inch - 1600 serie
Page 16 and 17: Single Row Radial metric - 6200 ser
Page 24 and 25: double row angular contact 5300 ser
Page 28 and 29: abec tolerances grade 1 & 3 BORE DI
Page 30 and 31: precision roller chain single pitch
Page 32 and 33: steel sprocket 1/2” pitch (ansi #
Page 34 and 35: steel sprocket 3/4” pitch (ansi #
Page 36 and 37: steel sprocket 1-1/4” pitch (ansi
Page 38 and 39: insert bearings ser200 series T j B
Page 40 and 41: insert bearings sa200 & csa200 seri
Page 42 and 43: mounted bearing unit pillow block -
Page 44 and 45: mounted bearing unit 2-bolt flange
Page 46 and 47: thermoplastic mounted bearing unit
Page 48 and 49: notes 46 LMS Bearings • 1751 Pano
Page 50 and 51: additional products In addition to
Page 52: 1750 Panorama Point - Unit A Lafaye

LMS Catalog (2018)

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