The Design of Rolling Bearing Mountings

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9 Drilling and milling spindleOperating dataInput power 20 kW; range of speed 11...2,240 min –1 .Bearing selectionRadial and axial forces are accommodated separately.The radial bearings are double-row cylindrical rollerbearings – an FAG NN3024ASK.M.SP at the workend and an FAG NN3020ASK.M.SP at the oppositeend. The double-direction angular contact thrust ballbearing FAG 234424M.SP guides the spindle in axialdirection. This bearing has a defined preload andadjustment is, therefore, not required.Machining of the housing bore is simplified in that thenominal outside diameters of the radial and thrustbearings are the same. The O.D. tolerance of the angularcontact thrust ball bearing is such as to provide aloose fit in the housing.Lubrication, sealingCirculating oil lubrication.The labyrinth seal at the work end consists of ready-tomount,non-rubbing sealing elements. The inner labyrinthring retains the lubricating oil, the outer labyrinthring prevents the ingress of cutting fluid.Machining tolerancesBearing Seat Diameter Form tolerance Axial runout tolerancetolerance (DIN ISO 1101) of abutment shoulderCylindrical roller bearing Shaft, tapered Taper 1:12 IT1/2 IT1Housing K5 IT1/2 IT1Angular contact thrust bearing Shaft h5 IT1/2 IT1Housing K5 IT1/2 IT19: Drilling and milling spindle21 FAG
10 NC-lathe main spindleOperating dataInput power 27 kW;maximum spindle speed 9,000 min –1 .Main spindle bearings do not normally fail due to materialfatigue but as a result of wear; the grease servicelife is decisive.Bearing selectionThe main requirements on this bearing arrangementare an extremely good speed suitability, rigidity, andaccurate guidance of the work spindle. At the workend, a spindle bearing set FAG B7017C.T.P4S.DTLin tandem arrangement is provided; at the drive end, aspindle bearing set FAG B71917C.T.P4S.DTL intandem arrangement.The bearings are lightly preloaded (UL) and have anincreased precision (P4S).The arrangement has no floating bearing; it is a rigidlocating bearing system. Both bearing groups togetherform an O arrangement.Bearing clearanceFAG spindle bearings of universal design are intendedfor mounting in X, O or tandem arrangement in anyarrangement. When mounting in X or O arrangement adefined preload results. The light preload UL meetsthe normal requirements.The original preload remains in the bearings due toouter and inner spacer sleeves of identical lengths.With a good bearing distance, the axial and radial heatexpansions of the work spindle compensate each otherso that the bearing preload remains unchanged underany operating condition.Bearing dimensioningThe size of the bearings is primarily based on the spindlerigidity required, i. e. on the largest possible spindlediameter. The fatigue life of the bearings is takeninto account for dimensioning but it does not play adominating role in practice.Lubrication, sealingThe bearings are greased for life with the FAG rollingbearing grease Arcanol L74V and about 35 % of thecavity is filled.Sealing is provided by labyrinth seals with defined gaps.Machining tolerancesBearing Seat Diameter Form tolerance Axial run-out tolerance oftolerance (DIN ISO 1101) abutment shoulderSpindle bearings Shaft +5/–5 µm 1.5 µm 2.5 µmDrive end/work end Housing +2/+10 µm 3.5 µm 5 µm10: NC-lathe main spindleFAG 22
Page 3: PrefaceThis publication presents de
Page 6 and 7: ContentsExample Title . . . . . . .
Page 8 and 9: assembly is contracted. Thus the ra
Page 10 and 11: Current insulationWhere converter c
Page 12 and 13: 4 Electric motor for domestic appli
Page 14 and 15: PulleyDrum5: Drum mounting of a dom
Page 16 and 17: 6: Rotor bearing arrangement of a v
Page 18: 7: Rotor bearing arrangement of a m
Page 21: 9-18 Work spindles of machine tools
Page 26 and 27: 13 High-speed motor milling spindle
Page 28 and 29: 15 Vertical high-speed milling spin
Page 30 and 31: 17 External cylindrical grinding sp
Page 32 and 33: 19 Rotary table of a vertical lathe
Page 34 and 35: 21 Rough-turning lathe for round ba
Page 36 and 37: 22: Flywheel bearing arrangement of
Page 38 and 39: 24 Double-shaft circular sawOperati
Page 40 and 41: Rollbending bearingsA counterbendin
Page 42 and 43: 27 Spur gear transmission for a rev
Page 44 and 45: The effects of basing the bearing d
Page 46 and 47: 29 Bevel gear - spur gear transmiss
Page 48 and 49: 31 Worm gear pairOperating dataInpu
Page 50 and 51: at least normal cleanliness (contam
Page 52 and 53: 33 Manual gearbox for trucksOperati
Page 54: 34 Final drive of a passenger carOp
Page 57 and 58: Driven and non-steered rear wheel36
Page 59 and 60: 38 Steering king pin of a truckA va
Page 61 and 62: 40 Water pump for passenger car and
Page 63 and 64: 42 Axle box roller bearings of an I
Page 65 and 66: 43-44 UIC axle box roller bearings
Page 67 and 68: 45Axle box roller bearingsof series
Page 69 and 70: 47Axle box roller bearingsof the Ch
Page 71 and 72: 48 Axle box roller bearings for an
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50Axle box roller bearingsaccording
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52Universal quill drivefor threepha
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54 Spur gear transmission for the u
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55 Bevel gear transmission for city
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56- 57 Spherical roller bearings as
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60 Spade-type rudderDesignThe slewi
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61-62 Ship shaft bearings and stern
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63-64 Ship shaft thrust blocksThe t
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64a: Complete ship shaft thrust blo
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65 RefinersWood chips from the wood
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66 Suction rollsSuction rolls are f
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68 Dryer rollsThe remaining water i
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69 Guide rollsGuide rolls guide, as
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70 Calender thermo rollsThe paper p
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71 Anti-deflection rollsAnti-deflec
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73 Run wheel of a material ropewayO
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74 Rope return sheaves of a passeng
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75 Rope sheave (underground mining)
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76 Rope sheave of a pulley blockIn
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77 Crane pillar mounting with a sph
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79 Roller track assemblyThe radial
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80 Crane run wheelOperating dataWhe
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81 Crane hookThe load suspended fro
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83 Head pulley of a belt conveyorOn
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Internal bearings for the tension/8
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Belt conveyor idlersMany industries
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87 Bucket wheel shaft of a bucket w
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89 Drive unit of a finished goods e
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91 Vibrating road rollerThe vibrati
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92 Double toggle jaw crusherDouble
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94 Double-shaft hammer crusherDoubl
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95 Ball tube millTube mills are mos
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96 Support roller of a rotary kilnR
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Vibrating machinesVibrating screens
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98 Two-bearing screen with straight
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99 Four-bearing screenThe vibration
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101-103 Large capacity convertersCo
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104Roll bearings of afour-high cold
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Work rolls for the finishing sectio
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107 Combined reduction and cogging
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108 Work rolls of a section millThe
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Two-high rolls of a dressing stand1
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110 Straightening rolls of a rail s
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111 Disk ploughIn a disk plough the
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112 Plane sifterSifters are used in
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Printing pressesPrinting quality is
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114 Blanket cylinder of a sheet-fed
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116 Axial piston machineCylinder bl
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117 Axial piston machineOperating d
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119 Hot gas fanGas temperature 150
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121 Optical telescopeOperating data
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122-124 RadiotelescopeFor radioastr
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123 Azimuth axis (track roller and
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GlossaryAdditivesAdditives are oil-
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GlossaryAxial clearanceThe axial cl
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GlossaryContamination factor VThe c
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GlossaryEP additivesWear-reducing a
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Glossary1. Safe retention and unifo
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GlossaryLoad angleThe load angle i
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Glossaryload and the ring to be fit
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Glossaryaligning ball bearings, bar
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GlossaryViscosityViscosity is the m
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NotesFAG 196
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The Design of Rolling Bearing Mountings

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