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and repair precision ground and rolled ball screws inch and metric sizes for a wide ...

precision ground and rolled ball screws rbc precision ball screws offer high ... is achieved in preloaded rbc precision ball screws rbc precision ball screws are ... choose from either precision ground ball screws in either inch or metric sizes ... on the application rbc will supply a ball screw with either internal or external ... ball returns special materials flanges and ... metric fiberglide® brand · thin section ball bearings standard cross sections to ... sections · airframe control bearings ball bearing types self-lubricating types ... · ground semiground and unground ball bearings full complement utilizes ... drive transmissions and gear boxes · ball screws precision ground rolled ball ... life low wear high accuracy quickturn® ball screw repair service · custom designed ...

table of contents pages 1 rbc ball screws 4-5 1.1 classification of ball screws 1 ... .2 standard precision ground ball screw availability table 1.3 standard ... precision rolled ball screw availability table 6-7 2.1 ... coefficient 25-27 2 features of rbc ball screws 9 driving torque 9.1 ball screw ... torque during acceleration 27-29 3 rbc ball screw selection procedure flow chart 4 ... accuracy of rbc ball screws 4.1 lead accuracy 4.2 mounting accuracy ... method 29-31 5 screw shaft design 5.1 ball screw manufacturing capability 5.2 ... 6.1 nut selection 6.1.1 series 6.1.2 ball re-circulation type 6.1.3 design of ... nut designs 12 rbc precision ground ball screws dimensional tables 35-55 7 ... stiffness 7.1.1 axial stiffness of the ball screw system 7.1.2 axial stiffness of ...

1 rbc ball screws 1.1 classification of ball screws pages precision metric series mm ... -series external ball return tube integral flange 36-37 38-39 ... im-series internal ball return deflector integral flange inch ... series gn-series external ball return tube integral flange gv-series ... external ball return tube std v-thd mounting optional ... -series high helix-large lead external ball return tube std v-thd mounting optional ... metric series rms-series external ball return tube std v-thd mounting optional ... flange rs-series external ball return tube std v-thd mounting optional ... m-series miniature-fine lead 40-47 rbc ball screws 48-49 50-52 53 56-57 inch series ...

1.2 standard precision ball screw availability tables inch series ... 6 8 10 12 xxxx 1.3 standard rolled ball screw availability tables inch series ... x 50 x 63 x rbc custom ground precision ball screws are available in many of the od/ ...

2 features of rbc ball screws 2.1 reliability rbc s commitment to ... at each manufacturing process of the ball screw rbc s quality system is built on ... free operation for the life of the ball screw 2.2 high accuracy all rbc ball ... the high mechanical efficiency of rbc ball screws results from the rolling contact ... of precision ball bearings and precisely ground ball ... friction of the conventional acme screw ball screw power requirements are minimized ... mechanical efficiency of rbc precision ball screw 6 ...

is minimized on conventional acme lead screws the drive torque becomes excessive and ... smooth the axial play in rbc precision ball screws may be reduced to zero by ... result in superior durability of rbc ball screws 2.6 lead time rbc has readily ... length requirements within days custom ball screws require our industry leading 6 ...

3 rbc ball screw selection procedure correct ... selection of the ball screw for the application is critical ... ensure proper operation and life of the ball screw the process of selection is shown ... etc lead accuracy precision ground ball screw length diameter lead nut ... sheet fig 3.1 procedure for selecting ball screws flow chart industrial rolled ... ball screw length diameter lead 8 ...

4 accuracy of rbc ball screws 4.1 lead accuracy lead accuracy of rbc ... ball screws is specified in three basic terms c ...

table 4.2 tolerance on specified travel ep tolerance on specified travel ep tavel length mm above 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 up to including 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 class 1 6 7 8 9 10 11 13 15 18 22 26 32 class 3 12 13 15 16 18 21 24 29 35 41 50 62 76 class 5 23 25 27 32 36 40 47 55 65 78 96 115 140 170 class 7 class 10 units µm unless specified table 4.3 variation per 300mm v300 and wobble error v2 variation per 300mm and wobble error accuracy grade 300 2 class 1 6 4 class 3 12 6 class 5 ...

mounting accuracy tolerances to use a ball screw correctly and achieve long life ... conform to both iso jis standards for ball screw measurement rbc will help you ... 1 bearing runout with respect to the ball groove 2 journal runout with respect to ... the ball groove 3 shoulder perpendicularity with ... perpendicularity with respect to the ball groove 5 nut body concentricity with ... respect to the ball groove 6 nut flat parallelism with ... respect to the ball groove 7 total indicated runout of the ... to the shaft center line all rbc ball screws are manufactured inspected and ...

5 screw shaft design 5.1 ball screw manufacturing capability rbc s ... are shown below rbc has manufactured ball screws up to 6 in diameter and up to ... 5.1 production scope rbc manufactures ball screws with specialized requirements ... including hollow ball screws for weight reduction or cooling ... purposes ball screws with specialty platings for corrosive ... combined right and left hand thread ball screws ball screws with specialized ...

the shaft typical mounting methods for ball screws are shown in the figure below ... fig 5.1 common end journal mounting for ball screws 13 ...

5.3.2 allowable tensile load when the ball screw will experience a tensile load ... the maximum load of the ball screw must be checked the formula is as ...

touch a diagonal line this line is your ball screw outside diameter 200 Ų4 100 80 Ų3 ...

extremely important to ensure that the ball screw rotation speed is not resonant ...

also restricted by the ability of the ball re-circulation system to withstand ... for this measure is the dm·n value dm ball circle diameter n rotation speed min-1 ... many ball screw manufacturers sell product with a ... non-heat treated ball re-circulation system which limits the ... in/min 70,000 mm/min rbc s standard ball re-circulation systems are heat treated ...

to ensure an economical design for your ball screw application the ball thread ... of the screw shaft for the following ball nut models this is to facilitate the ... loading of the ball nut package a internal deflector type b ... 5.5.2 hardness/transition zone rbc s ball screw shaft is induction hardened thus ... the required accuracy delivery size and ball nut style must be considered when ... series for your application 6.1.2 ball re-circulation type select the ball re- ... circulation type according to the ball nut mounting and application standard ... large lead screw shaft diameter ratio ball deflector type · compact ball nut ...

flop­over deflector nut ball screw external yoke style deflector · ... of nuts tight clearance between the ball nut and mounting housing should be ... avoided impact to the ball nut can cause breakage or denting of ... the ball return system decide the ball nut type ball return method and flange ... of the nut package removal of the ball nut for assembly purposes should be ...

radial loads optimal performance of the ball screw is realized when the load ... distribution on steel balls rolling between the screw shaft and nut ... loading on a small portion of the steel balls thereby affecting operational ... stiffness poor system stiffness of ball screws results in loss of positioning ... accuracy 7.1.1 axial stiffness of the ball screw system axial elastic displacement ... and stiffness of the ball screw system is calculated as follows ... axial 1 kn 1 kb 1 displacement of ball screw in load on feed system lbs ... stiffness of ball screw system lb/in stiffness of screw ... shaft lb/in stiffness of ball nut lb/in stiffness of support bearing ...

7.1.2 axial stiffness of screw shaft ks a fixed ­ free axe ks a ks axial stiffness of the screw shaft lb/in a cross-sectional area of the screw shaft in2 e modulus of elasticity 29 x 106 lb/in2 a distance between the support center of the nut in b fixed ­ fixed axexl ks axb ks axial stiffness of the screw shaft lb/in a cross-sectional area of the screw shaft in2 e modulus of elasticity 29 x 106 lb/in2 l unsupported length in a distance between the left support center of the nut in b distance between the right support center of the nut in 7.1.3 stiffness of nut kn an x e kn ln kn ...

7.1.4 preloading of ball screws preload eliminates axial backlash and ... thus improving the rigidity of the ball screw rbc offers the following preload ... double nut preload tension tension ball nut ball screw with the double nut ... nuts b single nut preloading oversized balls a single nut can be preloaded in two ... ways one method is to insert steel balls slightly larger than the ball groove ... space oversized balls which is referred to as four point ... for light preloading the use of spacer balls 1:1 ratio is standard to improve ... four­point contact nut idlers spacer ball screw shaft load balls effect of spacer ... balls 22 ...

tension lead tension lead a lead ball nut ball screw with the integral ... preload system one circuit of balls is loaded against the other circuit of ... balls to provide a tension preload this is ... of preload applying a load to the ball screw causes a deflection of both the ... ball nut and screw shaft grooves and of the ... ball bearing at the contact areas the ...

accuracy b pre-tensioning of the ball screw lead the basic lead of a ball ... generation · optimization of preload of ball screw and support bearing · correct ... and supply of lubricant · increase the ball screw lead thus reducing rotational ... speed b cool the ball screw · use a hollow screw shaft to ... allow cooling fluid to flow through the ball screw and remove heat · cool the ...

8 service life the service life of ball screws should be considered in terms of both ... .2 fatigue life the fatigue life of the ball screw may be estimated from the basic ... which allows 90 of a group of identical ball screws rotated under the same ... economical and results in a large size ball screw typical targets for fatigue life ...

moment loads or radial load on the ball screw reduces both operability and ... life careful installation of the ball screw is critical 8.3 allowable load on ... grooves when the ball screw is to be used infrequently or at ... deformation at contact points of the balls to ball grooves equal to 0.01 of the ... ball diameter 8.3.2 calculation of allowable ...

material hardness screw shaft4150 vds ball nut4150 vds ball bearing52100 rockwell ... 58 ­ 62 58 ­ 62 62 ­ 64 special ball screws 440c ss,17-4 ph ss for special ... surface treatments if necessary rbc s screwshaft is heat treated using a single bar ... correction factors 9 driving torque 9.1 ball screw torque 9.1.1 normal operation the ...

9.1.3 when a preload is applied dynamic torque produced by a preload can be calculated as follows ppl xlxk td 2x preload frictional torque inlbs preload lbs lead in preload torque coefficient normally 0.2 where td ppl l k 9.2 motor driving torque the torque required to drive a mechanical system against an external load is calculated as follows 9.2.1 driving torque at a constant speed [f µ x w x l t1 td 2 x x e1 ts where t1 td f µ w l e1 ts drive torque at constant speed inlbs preload frictional torque inlbs axial cutting force lbs coefficient of friction of the slide surface moving ...

specification can be used in most ball screw applications rbc s standard oil ... matter or water if allowed to enter the ball screw may increase friction and cause ...

10.2.2 optional nylon wiper precision series wiper optional nylon wiper 10.2.3 optional combination felt nylon wipers precision series felt wiper nylon wiper g optional combination felt nylon wiper 10.2.4 optional brush felt wiper precision series felt wiper brush wiper retaining ring optional brush felt wiper 10.2.5 optional brush wiper rolled series wiper retaining ring optional brush wiper 30

ends of the screw shaft to prevent the ball nut from running off the end of the ... shaft stops should be located so the ball nut does not come into contact with ...

indicates shaft length inches indicates ball nut style a std singlenut 2-circuit ...

11.2 non-standard precision series example gn1005 1 position 1 position 2 xxxxx 2 indicates series type indicates shop sequence number 11.3 standard rolled series example rs0308 1 position 1 position 2 position 3 12 2 f 3 a 4 3 5 5 6 x 7 position 4 position 5 position 6 position 7 indicates series type indicates threaded length of shaft indicated with of without flange f with flange o without flange indicates end annealing a annealed end o no annealing indicates annealed length in inches on left end journal or standard journal type e e1 f f1,h h1 see sketches length in inches of annealed ...

notes 34

12 rbc precision ground ball screws ­ dimensional tables rbc s standard ... series for precision ground ball screws covers a wide range of ball screw ... a metric lead series with an external ball return and an integral flange series ... is an inch lead series with an external ball return and integral flange series ... is an inch lead series with an external ball return and optional flange this ... fine inch lead series with an internal ball return this is available preloaded and ... a metric lead series with an external ball return and an optional flange 3 ...

12.1 mm series metric external ball return integral flange non­preload and ... bcedl model no major screw dia j ball dia lead mm a b c max defgh no of hole ...

12.1 mm series metric external ball return integral flange continued k h ...

12.2 im series metric internal ball return integral flange abdfec major ... 1378 0.2812 0.1378 0.2812 0.2812 0.2812 ball dia lead mm abcd max efgh 5 5 5 5 5 10 ...

12.2 im series metric internal ball return integral flange continued g g ...

12.3 gn series inch external ball return integral flange abcbcaeedd non­ ... 000 3.000 3.000 bababbbbbbbbbbbbbbbbbbj ball dia 0.1250 0.1250 0.1250 0.1250 0.1250 ...

12.3 gn series inch external ball return integral flange continued k h ...

12.3 gn series inch external ball return integral flange continued right ... 000 2.000 2.000 2.250 2.500 2.500 3.000 ball dia 0.1250 0.1562 0.1250 0.1562 0.1250 ...

12.3 gn series inch external ball return integral flange continued k h ...

12.3 gn series inch external ball return integral flange flange mount ... 1.50 2.00 2.00 2.00 2.25 2.50 2.50 3.00 ball dia 0.1250 0.1562 0.1250 0.1250 0.1562 ...

12.3 gn series inch external ball return integral flange flange mount ...

12.3 gn series inch external ball return integral flange base mount ... 1.50 2.00 2.00 2.00 2.25 2.50 2.50 3.00 ball dia 0.1250 0.1562 0.1250 0.1250 0.1562 ...

12.3 gn series inch external ball return integral flange base mount ...

12.4 gv series inch external ball return optional flange a c f type a i ... 250 1.500 1.500 1.500 1.500 2.250 2.250 ball dia nut lead type a b max c d v ...

12.4 gv series inch external ball return optional flange continued d 60 ...

12.5 rb series inch external ball return optional flange high helix ­ ... 000 1.500 1.500 2.000 2.000 2.000 2.000 ball dia 0.1250 0.1562 0.1562 0.1562 0.1875 ... 000 1.500 1.500 2.000 2.000 2.000 2.000 ball dia 0.1250 0.1562 0.1562 0.1562 0.1875 ...

12.5 rb series inch external ball return optional flange high helix ­ ...

12.5 rb series inch external ball return optional flange high helix ­ ...

12.6 p series inch internal ball return miniature ­ fine lead l2 l1 d1 ... 0.250 0.250 0.375 0.500 0.500 0.750 nom ball dia 0.0394 0.0394 0.0625 0.0393 0.0625 ...

12.7 standard end journals type a­ single bearing agbcfg type b­ duplexed bearings abcefdde gn series gn0505 gn0502 gn0605 gn0602 gn0705 gn0704 gn1004 gv series gv0502 mm series im series rb series a type a single bearing b 0.75 e 0.328 type b duplexed bearing a 2.00 b 1.12 e 0.687 type c multiple bearing a 2.69 b 1.81 e 1.390 1.62 gv0605 gv0602 gv0705 im1605 1.75 0.81 0.375 2.12 1.19 0.750 2.94 2.00 1.546 mm2005 im2005 mm2505 im2505 rb0701 rb0702 rb1001 1.87 0.87 0.406 2.31 1.31 0.835 3.18 2.18 1.680 gv1005 gv1004 2.37 1.06 0.520 2.91 1.59 1.071 4.03 2.71 2.154 gn1005 2.37 1.06 0.520 2.91 1.59 ...

12.7 standard end journals continued type c­ multiple duplexed bearings agcfbb type d­ pillow block a d d common dimensions for type a b and c c .312 311 d 1/8x1/16 f .3939 3936 g 0.56 e c type d pillow block nut n-00 washer w-00 bearing 200 a 2.25 b .3750 3745 c 1/8x1/16 d 1.25 basic pillow block no 006 .375 374 1/8x1/16 .4726 4723 0.62 n-01 w-01 201 2.44 .5000 4995 1/8x1/16 1.38 008 .500 499 1/8x1/16 .5908 5905 0.68 n-02 w-02 202 2.62 .6250 6245 3/16x3/32 1.50 010 .625 624 3/16x3/32 .7877 7873 0.71 n-04 w-04 204 3.15 .7500 7495 3/16x3/32 1.50 012 .625 624 3/16x3/32 .7877 7873 0.71 n-04 w-04 ...

13 rbc precision rolled ball screws ­ dimensional tables 13.1 rms series ... metric external ball return optional flange swept radius for ... 57.175 lead mm 5 5 10 10 25 5 10 10 10 ball dia 0.1378 0.1378 0.1378 0.1378 0.1562 ...

13.1 rms series metric external ball return optional flange continued k2 45 ...

13.2 rs series inch external ball return optional flange dfga 1 8 ­ 27 ... 723 1.723 1.723 1.868 2.222 2.222 2.483 ball dia 0.078 0.078 0.125 0.125 0.125 0.125 ...

13.2 rs series inch external ball return optional flange continued k2 45 ...

13.2 rs series inch external ball return optional flange continued l ... 500 3.000 recommended preload preloaded ball nut part no 8103-448-004 8105-448-008 ...

13.3 m series inch internal ball return miniature-fine lead l2 l1 d1 d2 ... dia d1 0.187 0.187 0.312 0.298 nom ball dia 0.0394 0.0394 0.0394 0.0625 model ...

13.4 standard end journals type e type f type hiabheechjkmhnopmegf type e1 dgfdlgfdl type f1 type h1 jbkcmopmdffdlfdl model no rs0605 rls0605 rms1605a rs0705c1 rs0705 rs0702 rss0702 rs1004c1 rls1004c1 rs1004a rls1004a rs1002 rs1001 rms2505a rms2510a rms2525a rs1105 rs1501 rs1504 rs1502 rls1502 rms4005a rms4010a rs2002 rls2002 rs2001 rms5010a screw dia abcdefghijklmnop 0.625 2.10 0.812 0.331 .4726 4723 .406 405 .469-32 0.125 0.625 3.00 1.70 1.225 .4756 4753 0.500 3.79 2.49 2.014 0.750 2.48 0.940 0.449 .5908 5905 .500 499 .586-32 0.125 0.625 3.54 2.08 1.586 .6153 6150 0.625 4.60 3.22 2.729 1.000 ...

13.5 standard end journals miniature fine lead series type aa a type bb a b type cc abcccdp­ series model no p-0405 p-0410 p-0610 p-0805 p-0810 p-1210 a type aa c .1876 1873 .1876 1873 .2501 2498 .3751 3748 .3751 3748 .5002 4999 a 1.125 1.125 1.750 1.875 1.875 2.375 b type bb c .1876 1873 .1876 1873 .2501 2498 .3751 3748 .3751 3748 .5002 4999 d 0.156 0.156 0.218 0.218 0.218 0.250 a 0.50 0.50 0.75 0.75 0.75 1.00 type cc b 0.156 0.156 0.218 0.218 0.218 0.250 c .1876 1873 .1876 1873 .2501 2498 .3751 3748 .3751 3748 .5002 4999 0.156 0.156 0.218 0.218 0.218 0.250 0.625 0.625 0.937 1.000 1.000 1.250 ...

14 quickturn® ball screw repair service rbc has repaired ... ball screws on the equipment of virtually every ... 800.62.renew for details quickturn® ball screw repair planning guide repair type ... weeks weeks weeks weeks warranty all ball screws are repaired by highly skilled ... guarantee all workmanship on repaired ball screws for one year 64 ...

backlash ­ the free motion between the ball nut and screw shaft without rotation ... axial rigidity ­ the resistance of the ball screw assembly to axial deflection ... load backdriving ­ the ability of the ball nut or screw shaft to rotate when an ... to the opposite member of the assembly ball bearing ­ the integral part of the ball ... and conforms to the accuracy of the ball path created by the assembly of the nut ... screws shaft and ball spacer ball idler ­ a ball that acts as an idler ... from the interplay between load balls the diameter of which is smaller than ... the adjacent load balls and carries no axial thrust load ball ... a specified number of recirculating balls travel transmitting the load reaction ... between the nut and screw shaft ball groove ball track ­ the helical groove ...

critical speed ­ rotational speed of a ball nut or ball screw shaft that produces a ... resonant vibration of the ball screw shaft deflection elastic ... deformation ­ the deformation of the ball screw assembly given an applied load ... actual force measured at a radius of a ball screw assembly with or without wipers ... including drag torque to actuate the ball screw assembly drunkenness ­ the ... characteristic of a ball screw assembly under load and rotation ... constant centric axial load that the ball screw can theoretically withstand for a ... revolutions efficiency ­ 90 ­ 95 for ball screws measured by the following ... end journal ­ the portion of the ball screw upon which is mounted the support ... or cycles fatigue life ­ life of the ball screw assembly under the condition of a ...

leadactual ­ the measured lead of the ball screw thread from a specified starting ... measured by the actual travel of the ball nut or accumulation of lead error of ... specified life ­ the usable life of a ball screw assembly given in terms of inches ... pitch ­ the distance from a point on a ball track to a corresponding point on the ... next track parallel to the ball screw or ball nut axis pitch ... passing through the centers of the balls when they are in contact with the ball ... screw and ball nut tracks precision ­ term used to ... preload ­ the use of one group of ball grooves in opposition to another to ... backlash and increase stiffness of a ball nut assembly radial load ­ load acting ... ­ total free radial motion between the ball nut and screw shaft without rotation ... reversibility ­ the ability of a ball screw assembly to reverse direction ...

­ the number of revolutions that the ball nut track makes about the screw axis ... vee-thread ­ threaded portion of ball nut or screw shaft variation ­ rate of ... condition velocity ­ refers to ball velocity within the ball track wipers ... ­ protecting elements included in the ball nut to exclude foreign material and ... in lead error for one revolution of the ball nut 16 conversion factors a length 1m ...

notes 69

notes 70

17 application data form ball screw application data form customer ... or n c universal 2 rotating member ball screw ball nut 3 major diameter ... 17 unsupported length 18 required ball return system internal external ...

in inch and metric sizes thin section ball bearings standard cross sections to one ... all sizes and standard cross sections ball bearings precision ground semiground ... loads long life smooth operation nicetm ball bearings are offered in caged and full ... track rollers airframe control bearings ball bearing types self-lubricating types ... gearboxes and final drive transmissions ball screws precision ground rolled ball ... life low wear high accuracy quickturn® ball screw repair service specials rbc ...