Catalog: Precision Rolling Bearings | |
| technical data ntn precision rolling bearings main spindle bearings ball screw ... support bearings ntn products appendix global network ... | |
| 1 classification of precision rolling bearings for machine tools 2 bearing selection ... rating and life 4 allowable speed 5 bearing arrangements and structures of bearings ... for main spindles 6 handling of bearings 7 lubrication of bearings 8 new ... technologies 9 angular contact ball bearings for radial loads 10 cylindrical roller ... bearing 11 angular contact ball bearings for axial loads 12 tapered roller ... bearings 2 5 16 21 22 27 39 48 55 215 247 273 13 ... ball screw support bearings 281 14 ntn products 1 cam followers for ... 2 ntn roller follower 3 magnetic bearing spindle 4 high precision air spindle 5 ... | |
| precision rolling bearings page technical data contents 1 ... classification of precision rolling bearings for machine tools q main spindle ... bearings w ball screw support bearings 2 4 2 4 15 5 7 11 14 21 16 20 21 26 22 ... 32 33 37 38 47 40 41 47 53 48 48 50 1 2 bearing selection and shaft housing design q ... bearing selection w bearing accuracy e bearings and rigidity r designing bearing and ... housing 5 3 load rating and life q bearing life w static load rating and allowable ... axial load 16 4 allowable speed 5 bearing arrangements and structures of bearings ... for main spindles qwerqwertyuio bearing arrangement for main spindles bearing ... selection based on bearing arrangement for main spindle adjustable ... preload bearing unit bearing jacket cooling system 22 6 handling of ... | |
| technical data 2 ball screw support bearings bearing type cross section bearing type ... -contact angular contact thrust ball bearing for ball screws sealed type bearing ... ¡surface modification treatment on the bearing ring raceways has led to a longer ... bearing life and much improved fretting ... grease the sealed type boasts a longer bearing life and simpler maintenance work ¡all ... 40 30 ¡the allowable axial load of this bearing type is greater owing to the improved ... design 292 293 angular contact ball bearing for ball screws ¡a clearance remains ... between the inner ring of radial bearing and the inner rings of both thrust ... bearings allowing the user to determine the ... based on the starting torque ¡the bearing clearance on certain preloaded bearings ... the inner rings on both thrust bearing with nuts or equivalent means ¡usually ... | |
| technical data 3 bearings and rigidity the rigidity of the main ... a machine tool is associated with both bearing rigidity and shaft rigidity bearing ... and raceway surface under load usually bearings are preloaded in order to increase the ... under same loading conditions a roller bearing has a higher rigidity than a ball ... bearing of the same size however having sliding ... portions a roller bearing is disadvantageous in supporting a high ... a larger shaft diameter however the supporting bearing must have a sufficient size and ... accordingly greater of course a larger bearing is disadvantageous for high-speed ... must be considered before the bearing rigidity bearing type and preload and ... type of the ntn angular contact ball bearing for a machine tool is manufactured ... | |
| height h should be larger than the bearing s maximum allowable chamfer dimensions ... directly contacts the flat part of the bearing end face the fillet radius ra must be ... smaller than the bearing s minimum allowable chamfer dimension ... min so that it does not interfere with bearing seating table 2.11 lists abutment ... height h and fillet radius ra for bearings that support very large axial loads ... a fillet radius ra max larger than the bearing chamfer dimension is required to ... adequate contact surface with the bearing fig 2.16b spacers may be used ... given in table 2.12 rrrrhrr fig 2.16 bearing mounting with spacer rrrh table 2.11 ... .6 1.3 1.5 2 2.5 2.5 2.5 3 4 5 6 7 1 if bearing supports large axial load the height of ... | |
| technical data 3 load rating and life 1 bearing life even in bearings operating under ... fatigue and will eventually cause the bearings to fail the effective life of a bearing ... of the total number of revolutions a bearing can undergo before flaking of either ... element surfaces occurs other causes of bearing failure are often attributed to ... etc however these so called causes of bearing failure are usually caused by improper ... lubrication faulty sealing or improper bearing selection since the above mentioned ... causes of bearing failure can be avoided by taking the ... to the dynamic rated load on the bearing therefore the fatigue life of a bearing ... operating conditions rather than a bearing s rating life can significantly affect ... the bearing functions running accuracy rigidity ... | |
| operation detach the fixture 4 bearing clearance measurement after insertion ... the spacer does not move next move the bearing outer ring up and down by hand and ... internal clearance rn the estimated bearing clearance n after press-fitting of the ... n 2 n dial indicator ntn handle gage support bolt fixture gage bolt open/close bolt ... ln so as to adjust the postmounting bearing clearance to the targeted clearance ¡by ... | |
| 9 running-in operation for main spindle bearings run-in is important for ensuring smooth ... of grease-lubricated main spindle bearings the following two modes of running-in ... are recommended 1 the bearing speed is gradually increased in steps ... to the next step fig 6.34 2 the bearing is run for several minutes up to about ... maximum allowable speed limit of the bearing this cycle is repeated two to three ... phase involves a steep increase in bearing temperature possibly deteriorating the ... quality of the lubricant the supporting data for the methods 1 and 2 are given ... the temperature of a main spindle bearing is measured on the front cover the ... temperature difference across the bearing outer ring and front cover reaches 2 to ... running-in operation is restarted 40 35 bearing mounted preload jacket cooling 5s- ... | |
| in fig 8.5 test conditions test bearing preload lubrication outer casing ... capable of higherspeed operation basic bearing number hse020 100 150 24 2 rows 2.5 kn ... required functions for the main spindle bearing speed rigidity durability precision eco ... type dmn valu 106 the ultage series bearings employ well-proven ceramic balls to ... the environmental impact for ball screw support grease lubrication 2a-bst lxl type 2a- ... | |
| ntn main spindle bearings 8 duplex arrangement codes for angular ... contact ball bearings each duplex ball bearing has a product number and duplex ... its side face on angular contact ball bearing sets of three or more each matching ... bearing has a mark on its outside surface ... align the mark when assembling the bearings note that duplex angular contact ball ... bearing types db and df do not have the mark ... universal matching angular contact ball bearings are often combined for a special ... rows of two or more when combining many bearings it is important to control the ... accuracies of the bearings and to align their face heights in a ... but it is possible only if the combined bearings have the same clearance/preload symbols ... bnt series 0 series and 2 series bearings designed for main spindles of machine ... | |
| ntn main spindle bearings !1 operating life of bearings with ... probability of failure test conditions bearing tested 6206 bearing load 6860 n 700 kgf ... 50 20 10 5 loading spring test machine support bearing 6312 coupling pulley test ... bearing 101 2 4 6 8 102 2 4 8 103 2 4 6 8 104 2 ... life ln 4 68 fig 9.16 radial load-type bearing life test machine fig 9.17 operating ... life of ball bearing with ceramic balls bearing friction torque n mm 70 steel ball ... | |
| ntn main spindle bearings 10 cylindrical roller bearings in a ... cylindrical roller bearing the rollers and raceways are in linear ... contact consequently this type of bearing can support a larger radial load than a ... point-contact ball bearing also its structure is suitable for high ... -speed operation a cylindrical roller bearing used for the main spindle of a machine ... 2 single-row cylindrical roller bearings single-row cylindrical roller bearings ... highspeed n10hsrt6 type the n10hs type bearings have high-strength machined brass cages ... while the n10hsr type bearings have special molded resin cages which ... from the high-speed n10hsrt6 type bearing and can be used with air-oil ... only 1 double-row cylindrical roller bearings double-row cylindrical roller bearings ... | |
| ntn ball screw support bearings ... | |
| ntn ball screw support bearings ball screw support bearings 13 ball ... screw support bearings contents 13 ball screw support bearings ... q angular contact thrust ball bearings 2a-bst series w duplex angular contact ... ball bearings ht series e needle roller bearings with double-row thrust needle roller ... bearings axn series 282 303 282 285 285 285 286 ... 287 290 291 291 292 293 needle roller bearings with double-row thrust cylindrical ... roller bearings arn series r bearing designations t bearing precision y ... tables angular contact thrust ball bearings bst and bst lxl series 2a-bst and 2a- ... 296 298 300 duplex angular contact ball bearings ht series needle roller bearings with ... double-row thrust needle roller bearings axn arn series 281 ... | |
| ntn ball screw support bearings 13 ball screw support bearings ntn ... ballscrew bearings are optimized to support a ballscrew these bearings are ... as shown in table 13.1 table 13.1 bearing types type code notes bore diameter 17 ... open type thrust angular contact ball bearing with 60° contact angle bst generally ... -lubricated sealed angular contact ball bearing with 60° contact angle 2a-bst lxl/l588 ... ht axn arn duplex angular contact ball bearing with 30° contact angle generally used ... with grease lubrication needle roller bearing with double-direction thrust needle ... roller bearing generally used with oil lubrication ... needle roller bearing with double-direction thrust ... cylindrical roller bearing generally used with oil lubrication 1 ... angular contact thrust ball bearings bst-1b lxl/l588 2a-bst-1b lxl/l588 ... | |
| ntn ball screw support bearings easy handling 2a-bst lxl type and bst ... -lubricated sealed angular contact ball bearings eliminate the need for grease filling ... type 1 0.8 0.6 0.4 ball screw support thrust angular contact ball bearings ... | |
| ntn ball screw support bearings 2 fretting resistance test rolling ... the decrease in the weight of the bearing plate after the test is shown in fig 13 ... oil fig 13.7 table 13.5 test conditions bearing mm radial load kn shaft speed min-1 ... °c evaluated with deep groove ball bearing 6206 30 62 16 6.86 2000 vg56 turbine ... test rolling table 13.4 test conditions bearing mm load kn max contact surface pressure ... temperature evaluated with thrust ball bearing 51204 20 40 14 2.5 1700 8 30 12 grease ... 0.4 0.2 0 wear 1/10 1 conventional type bearing plate suj2 lithium base general purpose ... grease 2 ultage series bearing plate suj2 with special heat treatment ... special grease 1 conventional type bearing plate suj2 lithium base general purpose ... grease 2 ultage series bearing plate suj2 with special heat treatment ... | |
| ntn ball screw support bearings 4 grease life test service life of the ... type 2 duplex angular contact ball bearings ht series ht type duplex angular ... contact ball bearings feature larger axial load capacity ... as a standard angular contact ball bearing contact angle 30° bearings smaller ... products table 13.6 test conditions bearing mm radial load n axial load n shaft ... °c evaluated with deep groove ball bearing 6204 20 47 14 67 67 10000 150 20 18 16 ... 13.8 grease life ratio 3 needle roller bearings with double-row thrust needle roller ... bearings axn series needle roller bearings with double-row thrust cylindrical ... roller bearings arn series axn and arn type bearings ... roller or thrust cylindrical roller bearings on both sides of a radial needle roller ... | |
| ntn ball screw support bearings 4 bearing designations the part number for a ... ballscrew bearing consists of a type code dimension code ... diameter mm nominal bore diameter mm bearing type code heat treatment ht type axn ... dimension tables dimension series code bearing type code axn 2052 p4 tolerance class ... bore diameter outside diameter mm bearing type code axn arn 286 ... | |
| ntn ball screw support bearings 5 bearing precision the precision of ballscrew ... bearings varies depending on the bearing type ¡2a-bst type available in ntn ... the main spindle angular contact ball bearing classes 5 and 4 are available ¡axn arn ... to d on relative to d on the the same bearing same bearing 2 the tolerance of outside ... | |
| ntn ball screw support bearings accuracy of ht type table 13.10 inner ... for class 2 2 applicable to individual bearing rings manufactured for duplex bearings ... | |
| ntn ball screw support bearings unit face runout with bore sd axial ... runout sia width variation bs single bearing class 5 class 4 class 2 high low high ... 8 8 3 3 4 4 1.5 1.5 2.5 2.5 vbs duplex bearing2 class 5 class 4 class 5 class 4 class 2 ... to bs relative to d of the same bearing 289 ... | |
| ntn ball screw support bearings accuracy of axn and arn type table 13. ... 12 inner ring and outer ring nominal bearing bore dia d or nominal bearing outside ... deviation mean outside dia 2 deviation bearing height deviation unit outer ring ... preloads for each type of ball screw support bearings are shown in the dimension ... enhanced by tightening the thrust bearing rings to supply preload preloads and ... tables to help control basic preload a bearing that allows preset preload by ... tightening the bearing raceways to adjust the clearance a ... between the both thrust bearing rings and radial bearing rings fig 13. ... | |
| ntn ball screw support bearings 7 shaft and housing fits recommended ... greased sealed angular contact ball bearings are easy to handle the back-to-back ... used for machine tools examples of bearing arrangement are shown in figs 13.16 and ... | |
| ntn ball screw support bearings 9 starting torque of 2a-bst type ... starting torque values for 2a-bst bearings are shown in tables 13.15 and 13.16 ... | |
| ntn ball screw support bearings !0 recommended lubrication ... specifications bst and ht ball screw support angular contact ball bearings are ... lubricated with grease bst lxl bearings with light-contact seals are packed ... with grease axn and arn bearings are generally lubricated with ... filling method refer to 6 handling of bearings q rinsing of bearings and grease ... | |
| ball screw support bearings dimension tables angular contact thrust ... ball bearings for ball screws bst series contact ... axial load pa number of rows in bearing arrangement number of rows subjected to ... | |
| ball screw support bearings when one row bears axial load df ... | |
| ball screw support bearings angular contact thrust ball bearings ... axial load pa number of rows in bearing arrangement number of rows subjected to ... | |
| ball screw support bearings when one row bears axial load df ... | |
| ball screw support bearings duplex angular contact ball bearings ht ... | |
| ball screw support bearings 2b 2b d2 d1 d d d1 d1 d d back-to-back ... | |
| ball screw support bearings needle roller bearings with double- ... direction thrust needle roller bearings axn series d 20 50mm t c r1 dw r d d dw ... | |
| ball screw support bearings r1a ra da da basic load ratings dynamic ... | |
| ball screw support bearings needle roller bearings with double- ... direction thrust cylindrical roller bearings arn series d 20 70mm t c r1 r dw d d dw ... | |
| ball screw support bearings r1a ra da da basic load ratings dynamic ... | |
| 2 ntn roller follower this type of bearing is used in mechanisms where the outer ... cylindrical configurations 3 magnetic bearing spindle the ntn magnetic bearing ... is comprised of two radial magnetic bearings and one thrust magnetic bearing which ... support the spindle by magnetic force all ... bearings in the five-axis control type spindle ... | |
| air spindle this air spindle can be supported without direct contact by feeding clean ... | |
