General: Design: Mating Component:

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2 General: Spiet djustable Locknuts adjust, preload, and secure bearings and oter macine components on safts and spindles wit a ig degree of stiffness. Tey permit te correct setting of te axial preload of bearings and ensure tat te working loads are carried safely. Te locknuts are secured positively witout additional components, keys, or extra macining. Te ig loadcarrying ability of te locknut is acieved troug full 0 contact around te tread flanks guaranteeing a vicegrip locking effect. Tis contact around te full circumference ensures tat te locknut will not loosen, even wen subjected to extreme sock loads. Tis is an important feature, since locking wit many coercially available locknuts relies on only one or a few "pinc" points on te circumference of te tread. noter advantage of te SPIETH locknut is te feature of aligning its contact face eiter wit zero runout or, if necessary, adjusted to suit inaccuracies of inline connecting components, tus compensating for minor errors of parallelism due to te stackup of mating parts. Spindle runout, due to uneven bearing loading, can terefore be eliminated. ig degree of accuracy can be maintained even wen repetitive tigtening and loosening are required. Te benefits of te SPIETH locknuts offer solutions for a wide range of general precision, eavy macinery, and equipment applications. Te unique locking capability, wit ig stiffness and accuracy, is excellent for spindle applications especially suited for ig speed and/or ig dynamicallyloaded spindles or mecanisms. Tread sizes are equivalent to te standard bearing locknut series N/N merican Standard National Class Fine, and metric sizes to ISO H fit. Te widts approximate two N/N locknuts. SPIETH SERIES MSW eavyduty DJUSTBLE LOCKNUTS are applied in conjunction wit combined needle and roller trust bearings, plain trust bearings, or taper roller bearings, on ballscrews, worm drives, bevel gears, and oter igtrustcarrying components. Design: Two axiallyarranged radial grooves, one from te outside and one from te inside, result in a diapragmlike crosssection wic gives te nut a predetermined axial elasticity. Te internal groove divides te nut into a clamping and locking section. Depending on te nut size, tree to eigt axially arranged socket ead cap screws are used to clamp te sections togeter. Tis eliminates te tread flank clearance between te saft tread and locknut and allows for sockproof locking. Depending on te size and load capacity, two types of locknuts are available. For all MSR, MS, and MSW sizes up to locknut 0., te axial bearing preload is adjusted by tigtening te locknut troug direct face contact. Size MSW 0.0 and larger use a number of clamping screws to reduce friction on te nut contact face, tus allowing for accurate preload adjustment. MSR Locknuts are made of alloy steel, MSW Locknuts are made of eattreated alloy steel. Bot locknut series ave a black oxide finis for rust protection. Te nut tread is manufactured to merican Standard Class Fine or ISO H fit. Te contact face is macined square to te treads witin.000 in. Bot types of locknuts are syetrical in construction and are manufactured from solid stock. Treads and contact faces are macined by special singlepoint treading tools in one setup to guarantee squareness. Balancing, terefore, is required only in extreme igspeed cases. Te SPIETH Locknut s main feature is its capability to lock onto te treads over te entire 0degree circumference. PRELODING NUTS: ll MSR, MS sizes, and MSW sizes up to 0.: Tese nuts ave oles or slots on te outer diameter, wic are suitable for available radial spanner wrences. Wen te nuts are used in recessed applications, a tubular face spanner wrenc wit exposed prongs for MSW series and pins for MSR or MS series is recoended. See Fig. 1 on page. PRELODING NUTS: Size MSW.0 and larger: Tese nuts are screwed into position eiter by and or by an available ook spanner wrenc and locked into position witout making face contact. Hardened clamping screws are ten used axially for preloading; wic, after adjusting, are secured in position by radial set screws troug aluminum slugs. See Fig. on page. Mating Component: MTING THRED: Te saft tread must be manufactured to merican Class fine or ISO Class if applied for igprecision spindles or class medium or ISO class g for general applications. Surface rougness must be low to avoid compaction during sock loads. MTING PRTS FOR LOCKNUTS UP TO SIZE MSW 0.: Te preload torque is applied directly to te nut. However, means must be provided on te saft to counter te torque. For optimum results, te accuracy of components assembled between te saft, soulder, and locknut contact face (bearing, gears, spacers, etc.) must be parallel and square to te bore witin.000 or better. In addition, te surface finis of te assembled components sould be a minimum of microinces or better in order to avoid surface compaction under load. MTING PRTS FOR NUTS SIZE MSW.0 ND LRGER: Te axial preload applied troug te ardened clamping screws must not act directly on te bearing face or soft surfaces. trust ring at least as tick as te bearing race sould be sandwiced in between te bearing and locknut. Te ring must be ardened, parallel, and square as specified above. If te design requires oter components suc as gears to be placed between te bearing and te locknut, again te accuracy must be eld as specified above to avoid excessive deflection and surface compaction. If tese components are ardened, te clamping screws can press directly against tem witout a trust ring. Page

3 Locking screw luminum (slug) Set screw Clamping section Locking section Clamping screw Clamping screw Fig. 1 Fig. Setting an axial pretensioning force: Fig. Te axial pretension of a treaded connection often plays a decisive role in successful function and must terefore be set wit accuracy. However, in most assembly sops, direct measurement of tis variable is not possible, making indirect metods of setting necessary. For tis purpose, te locknut tigtening torque corresponding to te required pretensioning force is calculated. Tis factor can be determined using te following equation. For all MSR, MS and MSW sizes up to 0.: Mv = (Fv + B) ( + µ r ) Mv = Tigtening torque of te locknut [Nm] Fv = Required axial pretension force of te screw connection [N] B = Locknutspecific allowance [N], compensates face end relief due to te locking process = Constant [], includes te calculation factors for te respective tread diameters (see table) µ = Coefficient of friction for te face contact surface of te locknut. pproximate value µ = 0.1 steel/steel r = Effective mean friction radius for te face contact surface of te locknut [] 1 N = ˆ 0. lbs 1 Nm = ˆ. inlbs 1 inc = ˆ. kg cm =. inlbssec Te locking process places te saft tread under stress and develops intensive surface contact (=ig axial rigidity). t te same time, tis serves to relieve tension on te face contact surface of te locknut. Tis effect can be simply compensated for by increasing te tigtening torque at assembly. Tis iger tigtening torque is determined by using te allowance B relative to te required pretensioning force Fv. For MSW size.0 and larger: Te tigtening torque for te set screw is determined according to te following formula: MD = Fv d ( + µd ) MD = Tigtening torque per set screw [Nm] Fv = Required axial pretensioning force of te screw connection [N] = Constant [], includes te calculation factors for te respective tread diameters (see table) µ D = Coefficient of friction for te face contact surface of te set screw. pproximate value = 0.1 d = Dog point dia. of te set screw [] (see table) Page

4 SPIETH Locknuts Series MSR Metric Fig. Fig. For sizes up to MSR 1x1 MSR 1x1. and larger MSR (d 1 x pitc) NSF class x 0. x 1 x 1 x 1. 1 x 1. 1 x 1 1 x 1. 1 x 1 1 x 1. 0 x 1 0 x 1. x 1. x 1. x 1. x 1. x 1. 0 x 1. x 1. x 1. x 1. 0 x 1. x 1. x 1. x 1. 0 x 1. x 1. x 1. x x 1. 0 x 1. 0 x x 1. x 1. x x 1. 0 x 1. 0 x x 1. x 1. x 0 x x 0 x x 0 x x 1 x x 0 x 1 x 10 x x 10 x x 10 x x 10 x 00 x Page d d.. Dimensions in d d d l e.... Clamp screws Sizes n T s SHCS Qty Nm M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x1 M x1 M x1 M x1 M x1 M x1 M x1 M x1 M x1 M x1 Mx1 M x1 M x1 M x1 M x0 M x0 M x0 M x0 M x0 M x0 M x0 M x0 M x0 M x M x M x M x M x M x M x M x M x M x M x M x M x M x0 M x0 M x0 M x0 M x0 Calculation factor Locknutspecific allowance B N llowable axial load dyn. stat. Mass moment of inertia In same quantity as clamp screws. Specifications are subject to cange witout notice. Spanner wrences available upon request. Specials available upon request J kg cm

5 Fig. SPIETH Locknuts Series MS Metric Designation of a locknut wit d 1 = M 0 x 1 : Locknut MS 0 x 1 Te allowable axial loads specified in te table are guideline values calculated wit a safety margin of 1. under static load, based on te minimum yield point, under dynamic loads, based on te minimum fatigue strengt. Series MS Locknuts wit reduced contact surface and in some cases smaller outside diameters relative to te MSR series are particularly suited for mounting angular ball bearings and cylinder roller bearings of ISO diameter series. MS size (d 1 x pitc) d d Dimensions in d d d l Clamp screws Sizes n T s SHCS Qty Nm Calculation factor Locknutspecific allowance B N llowable axial load dyn stat. Mass moment of inertia J kg cm 0x1 x1. 0x1. x1. 0x1. x1. 0x1. x1. 0x1. x1. 0x1. x1. 0x x 0x x 0x x 1x 0x 10x x 10x x 10x x 10x 00x M x M x1 M x1 M x1 M x1 M x1 M x1 M x1 M x1 M x1 M x0 M x0 M x0 M x0 M x0 M x0 M x M x M x M x M x M x M x M x0 M x0 M x0 M x0 M x In same quantity as clamp screws in Fig. and Fig.. Specifications and dimensions are subject to cange witout notice. Spanner wrences available upon request. Specials available upon request. Fig. Fig. Tis locknut provides a ig degree of axial rigidity for te bearing assembly of a ballscrew. Te locknut offers a particular advantage for fluctuating dynamic conditions. Tapered roller bearings require minimum runout and provide ig axial rigidity. radial force applied to tapered roller bearings will generate an axial force on te connecting components. Even if te preload is lost, te locknut remains safely locked. Page

6 SPIETH Locknuts Series MSW Metric Fig. Designation of a locknut wit d 1 = M 0 x 1. and lengt = : Locknut MSW 0. C t b Te allowable axial loads specified in te table are guideline values calculated wit a safety margin of 1. d d 1 d under static load, based on te minimum yield point, under dynamic loads, based on te minimum fatigue strengt. MSW size (tread x lengt) d 1 (d 1 x pitc) ISO H d Dimensions in d C b t Clamp screws Sizes n T s SHSC Qty Nm Calculation factor Locknutspecific allowance B N llowable axial load stat. Mass moment of inertia HEVY SERIES LIGHT SERIES 0 x x 0 x x 0 x x 0 x 0 x 0 x 0 0 x x 0 x x 0 x x 0 x x 0 x M 0x1. M x1. M 0x1. M x1. M 0x1. M x1. M 0x1. M 0x1. M x1. M 0x1. M x1. M 0x1. M x1. M 0x1. M x1. M 0x1. M x1. M 0x M x1 M x1 M x1 M x1 M x1 M x1 M x1 M x0 M x0 M x0 M x0 M x0 M x0 M x0 M x M x M x M x dyn J kg cm In same quantity as clamp screws. Specifications are subject to cange witout notice. Spanner wrences available upon request. Specials available upon request. Fig. Te ig loads are reliably transmitted to te feed drive tru te rigid locknut. Te excellent locking properties of te locknut are of major importance under dynamic loads. Page

7 Lock screw Fig. C SPIETH Locknuts Series MSW Metric, Large Set screw luminum slug Designation of a locknut wit d 1 = M x 1. and lengt = 0 : Locknut MSW.0 Te allowable axial loads specified in te table are guideline values calculated wit a safety margin of 1. d d 1 d d Clamp screw under static load, based on te minimum yield point, under dynamic loads, based on te minimum fatigue strengt. d MSW size (tread x lengt) x 0 x 0 d 1 (d 1 x pitc) ISO H M x1. M x d 1 Dimensions in d C 1 1 d d Qty Size n 1 T s SHCS Qty Nm M x M x0 Clamp screws dyn. 0 llowable axial load stat. 0 Mass moment of inertia J kg cm MSW size (tread x lengt) x 0 x 0 Size SHCS M x M x Preload set screw Lock screw n d Calculation M D factor Size n Qty Nm Qty SHCS M x M x Ø Lengt n..0 luminum slug Qty Recoended tigtening torque by te screw manufacturer. Subject to canges. Spanner wrences available upon request. Specials available upon request. Fig. Typical pplication Because of friction, te larger MSW locknuts cannot produce te required axial preload using te nuts own tigtening torque. xial preload is provided wit te setscrews in te nut body. Page

8 SPIETH djustable Locknuts Fig. Series MSR Inc Designation of a locknut wit d 1 = 1 x treads/in. Locknut MSR 1 x d 1 = / x 1 treads/in. Locknut MSR / x 1 Te allowable axial loads specified in te table are guideline values calculated wit a safety margin of 1. under static load, based on te minimum yield point, under dynamic loads, based on te minimum fatigue strengt. MSR (d 1 x tread) in NSF class 1 x 0 x x 0 x 1 x 1 0 x 1 x 1 0 x 1 x 1 0 x 1 x 1 0 x 1 x 0 x x 0 x x 0 x x 1 x 0 x 10 x x 10 x x 10 x x 10 x 00 x /" x 1 /" x 1 /" x 1 1" x /" x /" x 1/" x /" x 1/" x 1/" x 1/" x " x 1/" x 1/" x /" x " x Equivalent bearing nut N0 N0 N0 N0 N0 N0 N0 N N N N1 N1 N1 N1 N1 N1 N1 N0 N1 N N N N N0 N N N N N0 d Dimensions in inces d d d I M x M x M x M x M x1 M x1 M x1 M x1 M x1 M x1 Mx0 Mx0 M x0 M x M x M x M x M x M x M x M x M x M x M x M x0 M x0 M x0 M x0 M x0 Clamp screws Sizes n T s SHCS Qty in lbs MERICN STNDRD CLSS FIT x.0 x.0 x.0 x.0 x.0 x.0 x. x. x. x. x. x. x. x. x. 1/0 x. 0 0 Calculation factor Locknutspecific allowance B N llowable axial load Mass moment of inertia In same quantity as clamp screws. Specifications are subject to cange witout notice. Spanner wrences available upon request. Specials available upon request. dyn. stat. J kg cm Special Locknuts wit merican Standard Treads are made to your specifications. We invite you to furnis a sketc or layout indicating your design specifications. We will submit recoendations and application sketces to guarantee an optimum design. Page

9 MLE THRED DT Dimensions in Inces SPIETH MSR Locknut Major dia. Minor dia. max. MERICN NTIONL STD. FINECLSS FIT Limiting Dimensions for External Treads (Bolts) to Suit Spiet djustable Locknuts Pitc dia. Equiv. locknut no. Max. Min. Max. Min. Special N Special N Special N x N x N x N x1 N x1 N x1 N x1 N x1 N x1 N x1 N x1 N x1 N x N x N x N x N x N x N x N x N x N x N x N x N x N x N x N x N x N Fig. 1 SPIETH MSR Major dia. MIN. THRED LENGTH (bout x N or N lengt) Minor dia. max. MINOR DI. MX. Pitc dia. d 1 MJOR DI. Locknut Max. Min. Max. Min. /" /" /" " /" /" /" /" /" /" /" " /" /" /" " Fig. 1 Fig. 1 Fig. 1 Fig. 1 xial positioning of spring on saft. xial play adjustment on trust waser. djustment of axial trust bearings. Ball screw end mounting. Page

10 SSEMBLY OF SPIETH DJUSTBLE LOCKNUTS: Note tat te locking screws can only be tigtened wen te nut is engaged entirely on te male tread to avoid distortion of te locknut. Clean and oil te tread before engaging te nut. Once a Spiet locknut as been preloaded and locked on a tread, it sould not be put on anoter tread. Oterwise, ig adjustment accuracy migt not be acievable. For all MSR, MS and up to size 0. MSW Locknuts: Wit locking screws D loose, screw te locknut on to te saft tread C until it is witin.0" of te mating face E (Fig.. te treads, eliminating any subsequent compaction of nut, saft treads and contact surfaces. (Radial or face spanner wrences are available upon request). Ten loosen te locknut and torque to te desired preload. Secure te locknut in position by tigtening te locking screws D gradually, evenly, and crosswise. Face and radial runout of te mating component caused by suation of small errors in parallelism in te connecting parts can be eliminated by individually adjusting te locking screws (Fig. ). Fig. 1 C D Wit an llen wrenc, sligtly tigten eac locking screw D crosswise and uniformly until te locknut is barely turnable by and (te flank clearance is nearly eliminated). In tis condition, te centerline of te locknut as coincided wit te centerline of te spindle, te mating face is perpendicular to te coon centerline, and te tread flanks of te locknut are in uniform contact over te full circumference of bot te clamping and locking section (Fig.. Wit a spanner wrenc, tigten te locknut against te mating face E, wit increased preload to prestretc To release a SPIETH djustable Locknut, sligtly loosen te locking screws D crosswise before completely releasing all screws to avoid binding te last screw. Te locknut can be easily tigtened or loosened by means of a modified llen wrenc or by a special tube wrenc wit prongs or pins wen assembly and disassembly must take place axially. (Fig. 1, ) For eavy preload, use radial spanner oles rater tan face spanner oles to avoid deflection of te membrane of te locknut. Fig. 1 E E D SSEMBLY INSTRUCTIONS FOR SIZE MSW.0 ND LRGER: (Large Series) Fig. 0 Follow instructions in paragraps and above. t tis point, te locknut is at a distance of about.1 from te mating face E. Secure by tigtening te locking screws D to te required T s torque. Ten tigten te clamping screws F against te ardened mating face E crosswise initially tree to five times te required torque. Tis eliminates any subsequent compaction of nut, spindle treads and contact surfaces. Loosen te clamping screws F again and subsequently tigten to te required MD preload torque. Finally, tigten te set screws G and ceck te locking screws D once more to ensure te required T s torque setting. (Fig. 0) To release te locknut, first loosen te set screws G, ten sligtly loosen te clamping screws F in sequence and only subsequently loosen tese screws completely in a crosswise manner. Tis procedure avoids binding of te last screw. Release clamp screws D in a crosswise manner. E D F G Fig. 1 Fig. Fig. Tube Wrenc B D C E D Socket Wrenc Page Special wrences for tigtening clamp screws on recessed locknuts. djustment of locknut to compensate for minor inaccuracy of mating parts.

11 PPLICTIONS FOR SPIETH DJUSTBLE LOCKNUTS Fig. Fig. Fig. djustment of worm gear and bearings. Fig. SPIETH special flangetype locknut wit adjustable positioning of stop screw. Locknut is locked positively in any position. Fig. SPIETH Locknuts applied to provide adjustable support surfaces for a fourpost ram plate. Te distance and te parallelism are accurately establised by means of backlasfree locknuts. Squareness of te nut contact faces are easily adjusted. Deflection and misalignment of te guide posts will terefore be eliminated wen te counter nuts are tigtened. Fine adjustment and reliable locking are essential requirements on tis slipclutc assembly of a fully automated zipper assembly macine. Te SPIETH Locknut, incorporating suc features, permits positioning and locking in any axial location on te treaded saft. Head spindle assembly wit double row roller and trust bearings: djustment of axial preload accomplised wit SPIETH djustable Locknuts. Fig. Fig. 0 Special SPIETH djustable Lockscrew for preloading taper ball bearings. Special SPIETH Lockscrews incorporating suc features as labyrint grooves and oter configurations may be supplied to satisfy specific macine designs. Page

12 Te Family Of Saft Connectors & Guides Spiet Hydraulically ctuated Guide and Clamping Sleeves for automatic and concentric clamping of quills, safts, etc. Spiet Clamping Sleeves provide keyless, srinkfit connections. Spiet precision djustable Locknuts provide viselike locking witout wasers and keys. Spiet djustable Hydrodynamic Guide Busings provide accurate guiding, adjustable guide clearance, ydrodynamic lubrication effect. Linear and rotary applications. Contact us for a free copy of any Spiet component catalog: Spiet Hydrodynamic Expansion Gibs reduce te cost of macining and scraping, reduce vibration and catter, and compensate for minor macining inaccuracies on macine slides. 00 Latam Street Rockford, IL 1 Pone 1/0 Fax 1/ [email protected] TLSL0 Your Local dvanced Representative Is: