SKF Precision rail guides

1 SKF Precision rail guidesLinear MotionThe SKF GroupThe SKF Group is an internationalindustrial corporation of AB SKF Sweden, founded in 1907, operat-ing in 130 countries. The companyhas some 45000 employees andmore than 80 manufacturing facili-ties throughout the world. Its international network is support-ed up by nearly 20 000 distributorsand retailers. SKF is the worldleader in the rolling bearing , seals and special steelsare SKF s main product areas. Inaddition, they also manufactureand sell, other industrial precisioncomponents and products. Copyright SKF 1992 The contents of this catalogue arethe copyright of the publishers andmay not be reproduced (evenextracts) unless permission is gran-ted. Every care has been taken toensure the accuracy of the infor-mation contained in this cataloguebut no liability can be accepted forany errors or catalogues the data in whichdeviate from those given here, arerendered right is reserved to makechanges necessitated by technolo-gical n 4183 E 47173 3000 2000-01 Printed in Germanyby Weppert GmbH & Co.

2 KGSKF Linear MotionOne of these industrial precisionproducts assortment is manufac-tured and sold by the SKF LinearMotion unit has some 700 employees,6 manufacturing facilities, 3 prod-uct lines. One of the division sstrengths is its ability to serve themarket through its organizationbased on 11 specialized SalesCompanies located in Europe andNorth America; however productavailability and product applicationsupport is provided word-wide bythe SKF international Linear Motion product rangecovers: High Efficiency Screws Linear Guiding Systems Electromechanical ActuatorsCD-ROM Designer All linear Motion products are avai-lable in this CD, in DWG and to Designer , you caneasily copy the drawing of the product you need into your owndesign drawing. If you are inte-rested, please do not hesitate tocontact your local SKF sales orga-nization.

3 It is free of Motionspecialized companiesSKF Bearing companieswith Linear Motionspecialized salesforceManufacturing facilities461114202529333738394041 Product reviewProduct rangeTechnical informationLWR rail guidesLWRE rail guidesLWRM/LWRV rail guidesLWRPM/LWRPV rail guidesLWM/LWV rail guidesLWML/LWV rail guidesLWN/LWO rail guidesLWW/LWZ flat rail guidesLWJ/LWS flat rail guidesSpecial rail guides and slide units2 SKF Precision rail guidesIntroductionAs world leader in the manufacture ofrolling bearings, SKF supplies practic-ally every kind of bearing for rotationaland linear is therefore in a position tomeet almost any customer require-ment both technically and catalogue covers the SKF range of Precision rail guides and Precision rail guides are preci-sion products for linear motion andare therefore ideally suited for usewith in wide variety of machine tools,work centres, handling systems, special machinery, measuring andtest Modular range has intro-duced a new concept to the market ofinterchangeability of all the well knownguidance systems including the highcapacity LWRE type guides .

4 This matrix range of rail guides is suitablefor almost every area of Precision rail guides are avail-able in many different designs, sizesand standard lengths, incorporatingball, roller or needle roller assembliesand plain bearings. Suitable accesso-ries are also available for attachmentand use of SKF Precision rail guidesfacilitates the construction of econo-mical, clearance-free linear guides ofpractically any type and length,according of the building block prin-ciple. The characteristics of the guidesinclude: a constant, high degree of runningaccuracy low-friction stick-slip-free operation high speed of travel low heat generation low friction and high reliability high stiffness excellent load carrying capacityFor applications where high acce-lerations occur or where strokes areshort and of high frequency, SKF railguides with dry sliding liners are guides are also suitable formachine tool applications where thegood damping properties of theseplain bearing guides is of greater im-portance than the lower friction of therolling element rail guides .

5 For thoseapplications where rail guides , for in-stance because of their limited travelare unsuitable, SKF can supply alter-native forms of linear guidance systems. If you would like further de-tails, please contact SKF for technicaladvice. We will be pleased to providethe required information without obligation and at no cost, or to pre-pare a technical catalogue brings together allthe basic data which we consider tobe of interest. For additional informat-ion we recommend the SKF TechnicalHandbook, No. 4185 on Linear guid-ance systems which contains sec-tions on the selection, application,operational life, mounting and main-tenance of SKF Precision rail further specialised advice pleasecontact your nearest SKF sales data in this catalogue is basedon 1992 design and publications, the data inwhich deviates from that given here,are rendered reserve the right to make anynecessary technical changes to theinformation contained this catalogue the units used arein accordance with the international SIsystem.

6 Conditions of delivery andpayment are generally based on thoseruling at the time of 4 Product rangeModular Range .. 6 Other products .. 10 Technical dataAccuracy of rail guides .. 11 Grading of rail guides .. 12 Accuracy of adjacent 13 Selection of rail guides .. 13 Modular Range rail guidesTablesLWR rail guides with crossed roller and ball assemblies .. 14 LWRE rail guides with crossed roller assembly .. 20 LWRM/LWRV rail guides with needle roller assembly .. 25 LWRPM/LWRPV rail guides with dry sliding liner .. 29 Other rail guidesTablesLWM/LWV rail guides with needle roller assembly .. 33without tablesLWML/LWV rail guides with needle roller unit and adjustment wedges .. 37 LWN/LWO rail guides with needle roller 38 LWW/LWZ flat rail guides with roller unit.

7 39 LWJ/LWS flat rail guides with needle roller assembly .. 40 Special rail guides and slide 41 Contents4 SKF Precision rail guidesProduct reviewSKF Modular Range rail guidesLWRPM/PVLWRLWRM/VLWRELWR5 Product reviewOther productsLWMWLWULWF/GLWDWLWR 6 SonderLWR 6 Sonder6 SKF Precision rail guidesProduct rangeSKF Modular Range rail guidesThe SKF Modular Range consists of amatrix range of rail guide moduleswhich enable an individual choice ofcombinations of rails and rolling ele-ment assemblies. Different require-ments for the guides do not call forchanges in the design or mechanicalenvironment. The choice of appropri-ate rail guides is determined solely bythe mechanical conditions underwhich the guide system is to operating requirements are covered by five different models (fig 1)which may be defined as rail guideswith: crossed roller cage assemblies ofthe standard LWR series ball cage assemblies of the LWR series crossed roller cage assemblies ofthe optimised LWRE series needle roller cage assemblies ofthe LWRM/LWRV series slideway liners of theLWRPM/LWRPV series7 Increased performance achievablewithout design modificationThe Modular System is based on thewell-proven LWR design which coversa wide range of applications.

8 The newoptimised LWRE series offers eitherdoubled stiffness and a load carryingcapacity increased by a factor of fiveor, alternatively, for a given load carry-ing capacity, a 50 % reduction inbearing size compared with the standard LWR design (fig 2).carried out simply and with the mini-mum of all, where the user needs toincrease machine performance, a unitwith a higher load rating can be replacement is made easier bythe fact that no new attachment holesor fixing devices are required whenusing rail guides of the Modular Range. An additional advantage is theworld-wide availability through distri-butors, simply by quoting the appro-priate catalogue number. The internaldesign of the LWRE Series assures in-creased operational life through theeven distribution of load.

9 This resultsfrom the optimisation of the cross-section, enabled through the use oflarger rolling elements. The new de-sign allows a significant improvementin the roller/raceway contact perfor-mance. An important additional bene-fit from the updating programme isthe introduction of the practicallymaintenance-free cage made of POMwhich matches are stringent demandsfor long operational life of the rollingelements and maintains is dimensio-nal stability up to +80 C. The indivi-dual rollers are well covered and thespace between the rails is almost filled, thus providing good protectionagainst contamination. A special cha-racteristic of these cages is that theyconsist of snap-on elements and canbe adapted to suit individual needs(fig 3). Conventional crossed roller cages have their rollers arranged alternately evenly spaced, so that onlyhalf the rollers in a preloaded guideare load-bearing while the remainderact as idlers.

10 In the new LWRE cagethese essentially unused rollers cabbe partially turned in the direction ofthe load. For this purpose each indivi-dual cage segment is designed to beturned through 90 about the longitu-dinal axis. These are manual adjust-ments and no special instructions arerequired when ordering from the rangeIn order to simplify the application ofModular Range of rail guides even easier, all guides within a given sizerange have the same external dimen-sions and thus fit the space require-ments of most commercially availablerail guides . This results in a very wide choice in terms of load carryingcapacity, stiffness and operating the economical point of view,the use of the optimised LWRE Seriesoffers a double advantage. Firstly (although the initial cost is higher) therange of application is extended signi-ficantly as regards stiffness and loadcarrying capacity; this results in a bet-ter price/performance ratio.