NTN - Precision Rolling Bearings

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NTN Main Spindle Bearings 6 Recommended fit for angular contact ball bearings If the dmn value is in the range of dmn75010 3 (dm: pitch circle diameter across rolling elements [mm], n: speed [min -1 ]), the fit values shown in Tables 9.20 and 9.21 are recommended to ensure high accuracies of precision bearings. If the dmn value is in the range of dmn75010 3 , it is necessary to consider expansion of inner ring caused by centrifugal force. In this case, contact NTN Engineering for the recommended fit. As for the fit of the outer ring with the housing, consider the influence of the ambient temperature (such as heat buildup on a built-in motor or the cooling effect of jacket). For technical assistance, contact NTN Engineering. Table 9.20 Shaft fit Nominal bore diameter d Over 2.5 10 18 30 50 80 Incl. 10 18 30 50 80 120 Fit of inner ring with shaft 02T 02T 02T 03T 1T4T 1T5T Unit: 7 Duplex angular contact ball bearings Duplex angular contact ball bearings can be combined in rows of two, three or four bearings to accommodate required specifications. The back-to-back duplex (DB) arrangement and the face-to-face duplex (DF) arrangement allow for the application of both radial loads and axial loads in both directions. The DB arrangement has a wide space between load points and can handle large moment loads. For this reason, this type of duplex arrangement is preferable for use on the main spindles of machine tools. The DF arrangement cannot handle large moment loads, but its allowable inclination angle is greater than that of the DB arrangement. The tandem duplex (DT) arrangement can handle both a radial load and large axial load, but this bearing can take the axial load in one direction only. The 4-row duplex (type DTBT) arrangement ensures high rigidity in the radial and axial directions and accommodates high-speed operation. For this reason, this type of duplex bearing is commonly used for the main spindles of machining centers. Each duplex angular contact ball bearing is manufactured as a set to enable adjustment of the preload and clearance. For this reason, combine only duplex bearings of the same product number. 120 180 180 250 2T7T 2T8T Notes: 1. The mean value should be the target value. 2. If the dmn value of the high-speed machine is in the range of dmn75010 3 , it is necessary to increase the amount of interference. In this case, contact NTN Engineering for technical assistance. T: Tight (Interference) Fit DB duplex arrangement DF duplex arrangement DT duplex arrangement Table 9.21 Housing fit Unit: Nominal outside diameter D Fit of outer ring with housing Over Incl. Bearing on fixed side Bearing on free side 10 50 80 50 80 120 2L5L 3L7L 4L9L 6L10L 6L12L 8L13L DBT duplex arrangement Fig. 9.5 DTBT duplex arrangement 120 150 180 150 180 250 5L11L 6L13L 7L15L 10L16L 11L17L 13L20L 250 315 8L17L 15L23L Notes: 1. The mean value should be the target value. 2. If the dmn value is in the range of dmn10010 4 , spacer width and bearing arrangement, it is necessary to increase the amount of interference. In this case, contact NTN Engineering for technical assistance. L: Loose fit 68
NTN Main Spindle Bearings 8 Duplex arrangement codes for angular contact ball bearings Each duplex ball bearing has a product number and duplex arrangement code etched on its side face. On angular contact ball bearing sets of three or more, each matching bearing has a "
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R Precision Rolling Bearings %
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1. Classification of Precision Roll
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Precision Rolling Bearings Page TEC
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Technical Data Bearing type Cross s
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Technical Data 2. Bearing Selection
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Technical Data 2 Bearing accuracy B
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Technical Data N.R.R.O. (Non-Repeti
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Technical Data 3 Bearings and rigid
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Technical Data Gyratory sliding Ev
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Technical Data Abutment height and
Page 21 and 22: Technical Data where, L m : Total l
Page 23 and 24: Technical Data NTNs new bearing lif
Page 25 and 26: Technical Data Table 3.3 Minimum sa
Page 27 and 28: Technical Data Bearing arrangement
Page 29 and 30: Technical Data 3 Adjustable preload
Page 31 and 32: Technical Data 6. Handling of Beari
Page 33 and 34: Technical Data Table 6.1 Fitting su
Page 35 and 36: Technical Data 4 Elastic deformatio
Page 37 and 38: Technical Data 7 Clearance adjustme
Page 39 and 40: Technical Data (2) Setup of mounted
Page 41 and 42: Technical Data 8 Tapered bore cylin
Page 43 and 44: Technical Data 7. Lubrication of Be
Page 45 and 46: Technical Data 2 Air-oil lubricatio
Page 47 and 48: Technical Data E A D Fig. 7.4 7U,
Page 49 and 50: Technical Data 7805C7834CT17928CT1B
Page 51 and 52: Technical Data 3 Jet lubrication Wi
Page 53 and 54: Technical Data Life under high temp
Page 55 and 56: Technical Data Grease-lubricated s
Page 57 and 58: Technical Data (2) Noise Reduction
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Page 63 and 64: NTN Main Spindle Bearings HSE type
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Page 67 and 68: NTN Main Spindle Bearings Table 9.6
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NTN Main Spindle Bearings Main Spin
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NTN Main Spindle Bearings 3 Bearing
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NTN Main Spindle Bearings Perpendic
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NTN Main Spindle Bearings Interchan
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NTN Main Spindle Bearings 8 Recomme
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NTN Main Spindle Bearings High spee
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NTN Main Spindle Bearings High-spee
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Main Spindle Bearings !5 Dimension
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NTN Main Spindle Bearings 2 Standar
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NTN Main Spindle Bearings 5 Accurac
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NTN Main Spindle Bearings 7 Shaft a
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NTN Main Spindle Bearings High spee
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Main Spindle Bearings r1a ra Wo 4-d
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NTN Main Spindle Bearings 3 Accurac
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Main Spindle Bearings Sa Sb r1a Dyn
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Main Spindle Bearings Sa Sb r1a Dyn
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NTN Ball Screw Support Bearings Bal
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NTN Ball Screw Support Bearings Eas
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NTN Ball Screw Support Bearings (4)
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NTN Ball Screw Support Bearings 5 B
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NTN Ball Screw Support Bearings Fac
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NTN Ball Screw Support Bearings 7 S
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NTN Ball Screw Support Bearings !0
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Ball Screw Support Bearings When on
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Ball Screw Support Bearings When on
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Ball Screw Support Bearings Part nu
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Ball Screw Support Bearings B B 2B
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Ball Screw Support Bearings r1a ra
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NTN Products 5 Radial internal clea
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NTN Products (Reference) Standard c
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NTN Products 4. High precision air
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301 Appendix Table 1: Boundary dime
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Appendix Table 2: Comparison of SI,
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Appendix h4 h5 h6 h7 h8 h9 h10 h11
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Appendix H7 H8 H9 H10 H11 H13 J6 Js
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Appendix Table 8: Viscosity convers
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311 Appendix 1/64 1/32 3/64 1/16 5/
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NTN - Precision Rolling Bearings

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