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Machine Tool Spindle Bearing Selection

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Machine Tool Spindle Bearing Selection B68=>C:IDDAHE>C9A:7:6G>C< H:A:8I>DCBDJCI>C<<J>9: Contents Introduction Bearing Selection ● Overview ● Identification Marks ● Contact Angle Bearing ● Universal Sets Selection ● Precision Grades ● Preload ● Bearing Matching Pre-Mounting ● Cleanliness ● Washing ● Greasing Procedure Pre- ● Grease Quantities Mounting ● Component Checks Mounting ● Fitting Bearings to Shaft ● Locknut Torques ● Spindle Runout Checks ● Fitting Spindle to Housing Mounting ● Mounting Tapered Bore Roller Bearings - Calculation Method - Gauge Method ● Summary of Spindle Arrangements - Heavy Duty Spindle - Medium to High-Speed Spindle Post-Mounting ● Preload Checks ● Alignment and Balance ● Running In Post- ● Trouble Shooting Mounting - Cause of High Temperature - Cause of Noise Upgrading ● Robust Design ● Improved Steel ● Sealed Bearings ● Hybrid Bearings Upgrading ● TYN Cages ● TAC Thrust Bearing Conversions ● TB Cages Supplementary Information ● Bearing Interchange Guide ● Bearing Failure Countermeasures ● Sound and Vibration Diagnosis ● Appendix of Preload Tables Information ● Bearing Preload Conversion Tables Supplementary ● Bore and OD Matching Chart Useful Tips Index | 1 HEADERThe NSK brand, recognised around the world From home appliances, automobiles, and capital equipment to the aerospace industry – NSK bearings are used in an extensive range of applications. NSK established its global-scale enterprise on technology that has met the exact requirements of global industry. We have also established R&D systems and support services to meet the diverse needs of our customers in every continent. As a brand recognised around the world NSK continues to lead industry with its technical prowess. NSK is on the move, across the globe HEADQUARTERS PLANTS SALES OFFICES America America (North) Africa Europe (North and South) · Ann Arbor · Johannesburg · Maidenhead · Ann Arbor · Clarinda America (North) · Newark Asia · Franklin · Ann Arbor · Coventry · Shanghai · Liberty · Indianapolis · Paris · Singapore · Bennington · Chicago · Dusseldorf Europe America (South) · San Jose · Stuttgart · Maidenhead · Suzano · Los Angeles · Leipzig Japan Asia · Bennington · Milano · Tokyo · Kunshan · Miami · Barcelona · Anshun · Atlanta · Warsaw TECHNICAL OFFICES · Dongguan · Montreal · Istanbul America · Zhangjiagang · Toronto Japan (North and South) · Suzhou · Vancouver · Tokyo · Ann Arbor · Changshu America (South) · Osaka Asia · Chennai · Buenos Aires · Nagoya · Kunshan · Jakarta · Sao Paulo Oceania Europe · Changwon · Belo Horizonte · Melbourne · Newark · Balakong · Joinville · Sydney · Kielce · Chonburi · Porto Alegre · Brisbane Japan · Chachoengsao · Recife · Adelaide · Fujisawa Europe · Mexico City · Perth · Maebashi · Peterlee Asia · Auckland · Newark · Beijing 27 other offices · Kielce · Shanghai · Munderkingen · Guangzhou · Torino · Anshun Japan · Chengdu · Fujisawa · Hong Kong · Hanyu · Taipei · Otsu · Taichung · Konan · Tainan · Takasaki · Seoul · Haruna · Chennai · Maebashi · Jakarta · Tanakura · Manila · Ukiha · Bangkok · Kuala Lumpur · Prai · Johor Bahru · Kota Kinabalu · Singapore | 2 | 3 Introduction Machine Tool Precision bearings are very This catalogue follows a logical Some sections include a useful tip accurately engineered components and progression through selection of the like the one shown below, these tips as such are very important to the correct bearing types, to the importance are based on many years of successful performance of the machine of cleanliness before attempting to experience and can be particularly tool. assemble the spindle. A detailed part of useful for newcomers to the spindle The way in which a bearing is handled assembly procedures is included with repair business and a good reminder and fitted to a machine tool does not only many photographs and drawings. to the more experiences engineers. determine if the machine operates Pre-test checks, ‘running in’ and trouble accurately but can also affect the life of shooting is also included to allow the 1. Useful Tip the bearing in the spindle. builder more scope in solving spindle This catalogue is intended to be a problems. If it is not possible to measure the comprehensive guide to anyone who fits A further section called Upgrading is shaft and housing runouts it is bearings to a machine tool regardless to included to explain how to improve both advisable to position the bearing whether it is in planned maintenance or the performance and most of all the high points out of line so as to avoid reactive to a breakdown. reliability of a spindle. In nearly all cases accidentally aligning the bearing high this can be simply done by replacing the points with the shaft high bearing and no changes being necessary points thereby to the actual spindle design. increasing overall runout. The successful build of a spindle will depend on close attention to details as illustrated below: Bearing Fitting Bearings Cleanliness To Spindle selection Heating Grease Vee Marking Correct O-Rings Area Precision Pressing Oil High Matching Locknuts Equipment Points Applying Grease Washing Preload Misalignments Workbench Checking Components Handling Contact Runouts Storage Angle Rigidity Noise High Resonant Grease Failure Temp Frequency Oil Analysis Torque Spindle Arrangements Trouble Pre-test Checks Running-In Shooting Bearing Selection Pre-Mounting For ease of navigation through the catalogue, an Mounting icon at the edge of the page highlights the main sections. Post-Mounting Upgrading Supplementary | 4 BEARING SELECTION Bearing Selection ● Bearing Selection Overview 6-7 ● NSK Super Precision Range 8 Bearing Selection ● Identification Markings 9-10 ● Contact Angle 11 ● Universal Sets 12 ● Precision Grades 13 ● Preload - Angular Contact 14-16 ● Preload - Cylindrical 17 ● Bearing Matching 18 | 5 Bearing Selection Overview Conventional Type 72, 70, 79 Series Robust Series, High-Speed Type 70 16 A5 TRV1V DU L P3 80 BER 10S T V1V SU EL P3 Precision Class: Precision Class: P4: ISO Class 4 (ABEC7) P4: ISO Class 4 (ABEC7) P3: Dimensions - ISO Class 4 P3: Dimensions - ISO Class 4 Running Accuracy - ISO Class 2 Running Accuracy - ISO Class 2 P2: ISO Class 2 (ABEC9) P2: ISO Class 2 (ABEC9) Preload: EL: Extra Light Preload: L: Light L: Light Gxx: Preload in Kgf (G5=5 Kgf) CPxx: Median Preload in M: Medium Microns (CP10=10μm) H: Heavy CAxx: Median Axial Clearance in Gxx: Preload in Kgf (G5=5 Kgf) Microns (CA15=15μm) CPxx: Median Preload in Microns (CP10=10μm) Mounting Configuration: CAxx: Median Axial Clearance in Microns (CA15=15 μm) SU: Single Universal DU: Duplex Universal DB, DF, DT: Duplex Arrangement Mounting Configuration: DBD, DFD, DTD, DUD: Triplex Arrangement SU: Single Universal DBB, DFF, DBT, DFT, DTT, QU: Quad Arrangement DU: Duplex Universal DB, DF, DT: Duplex Arrangement Seal: DBD, DFD, DTD, DUD: Triplex Arrangement No Symbol: Open type DBB, DFF, DBT, DFT, DTT, QU: Quad Arrangement V1V: Non contact rubber seal Seal: Retainer: No symbol: Open type T: Phenolic Cage V1V: Non contact rubber seal TYN: Polyamide Cage T42: PEEK Cage Retainer: Material: TR: Phenolic Cage S: Steel Ball TYN: Polyamide Cage H: Ceramic Ball X: SHX rings, ceramic balls Material: Dimension Series: Blank Symbol: Bearing Steel (SUJ2) 10: Same bore diameter, outside SN24 : Ceramic Balls diameter, and width as the 70 series 19: Same bore diameter, outside Contact Angle: diameter, and width as the 79 series A = 30° Bearing Type: A5 = 25° C = 15° BNR: 18° Contact Angle BER: 25° Contact Angle Bore Number: BGR: 15° Contact Angle Bearing Series: Nominal Bore Diameter: | 6 BEARING SELECTION Thrust Angular Contact Ball Bearings Bearing Selection 100 BAR 10 S TYN DB L P4A 140 TAC 20D PN7 +L C6 Precision Class: Preload Class: P4A: ISO Class 4, O.D. is Special P2A: ISO Class 2, O.D. is Special C6: Standard Preload for Grease Lubrication Preload: C7: Standard Preload for L: Standard Preload Oil Lubrication EL: Standard Preload for High-Speed Applications Spacer (Inner Ring): CP: Special Preload CA: Special Axial Clearance Precision Class: Combination: PN7: ISO Class 4, O.D. is Special DB: Back to Back Duplex Dimension Series: Retainer: 20D: High-Speed Type TYN: Polyamide Cage w/Revised Internal Material: Features S: Steel Ball 29D: High-Speed Type H: Ceramic Ball w/Revised Internal Features Dimension Series: 10: Arranged with Bearing Type: NN30XX Series Bearing Type: Bearing Bore Diameter (mm): BAR: 30° Contact Angle BTR: 40° Contact Angle TAC size range from 140mm to 280mm. Please see page 55 showing how to upgrade from old TAC to new BTR/BAR for sizes from 35mm to 130mm bore. Bearing Bore Diameter (mm): Ball Screw Support Bearings Cylindrical Roller Bearings 30 TAC 62 BDDG SU C10 PN7B NN 3017 MB KR E44 CC0 P4 Precision Class: Precision Class: P2: ISO Class 2 PN7A: Standard Accuracy P4: ISO Class 4 (Equivalent to ISO Class 4) † PN7B: Special Accuracy (Bore Radial Clearance: diameter and OD are exclusive CC1: Standard clearance for cylindrical bore to NSK. Equivalent to ISO CC0: Standard clearance for tapered bore Class 4. For SU arrangement only. CCG: Special radial clearance Lubrication: Preload: E44: Outer ring with machined lubrication C10: Metric Series - Standard Preload groove and holes (Double Row Only) C11: Inch Series C9: Light Preload Bore Configuration: KR: Ultra Precision Tapered Bore (1:12) Mounting Configuration: Blank symbol: Cylindrical bore SU : Single Universal Retainer: DU: Duplex Universal DB, DF, DT: Duplex Arrangement MB: Roller guided machined brass cage (Double Row) DBD, DFD, DTD, DUD - Triplex Arrangement TB: Roller guided
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