MACROTECH POLYSEAL, INC.Service, Solutions, PerformancePrecision Close ToleranceWear GuidesWGT-1000REV #102003
Manufacturing CapacityMacrotech Polyseal produces high precisionWear Guides in high strength reinforcedmaterials in sizes from as small as one inchdiameter to as large as eighteen inches indiameter and fourteen inches in length.Smaller diameters are available in othermaterials. Our ISO 9001 facility provides thesame repeatable quality for all sizes.Macrotech Polyseal has been producing highprecision Wear Guides since 1990 and hasshipped over 2.5 million rings worldwideMacrotech Polyseal Wear Guides are availablein simple butt cut form, angle cuts or step cutfor more demanding use. Several standardsizes of radial C/S width are available from1/16” to 3/16”. Most commonly used are 1/8”C/S and 2,5 mm C/S. Consult with MPIengineering or customer service for specialsizes.2
Par t NumberingStandard Part NumberingMetric Part NumberingWGT - 125 - 01.750 - 500StyleCrossSectionNominal ODMPS - 080 - 086 - 050 - WGTNominalWidthExample: nominal size, 1.500” ID x 1.750” OD x .500” HTC/S thickness tolerance: .123/.125”I.D.O.DNominalWidthStyleExample: nominal size, 80mm ID x 86 mm ODC/S thickness tolerance: 3,00/2,95Macrotech Polyseal wear guides are designed to fiteither rod or piston applications. For applications whereinstallation is a concern a Rod or Piston style wearguide can be specified. To do this, an R or P can beadded to the end of the part number for either Rod orPiston, respectively. This will assure a free state gapthat is conducive for installation purposes.Recommended Radial Cross Section versus DiameterNominal OD0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5Cross.875Section0.062Light sections of chart indicate thatinstallation may be more simple forblind rod glands. An increased axiallength will increase complexity duringinstallation. Consult MPI engineeringfor specific concerns.18 1.3120.093Non-standard cross sections areavailable upon request. Consult MPIengineering for wear guides smallerthan 1” nominal OD.1.3120.0981.7500.1181.7500.1254.0000.187Joint StylesAdvantagesInstallationPerformanceEasiest joint style to install in mplexGoodBestEasyMoreComplexGoodBestWGT - Butt CutImproves bearing stress at the gap.WAT - Angle CutMore difficult to install.Improves bearing stress at gapWST - Step CutBetter resistance to contaminants &spike loadsWST style not available in 3/16 cross section.3
Why Choose Precision CloseTolerance Wear Guides?Macrotech Polyseal Wear Guides replace metallicbearings in hydraulic cylinders and otherapplications providing a contact surface forreciprocating cylinder rods and pistons - reducingthe cost of the metal components. When wearguides are used, metal components can beproduced from low cost materials that may not besuitable for bearing service. Since metal surfacefinishes may require less control, metal machiningspeeds may be faster - resulting in further costsavingsMPI Wear Guides are finish machined to athickness tolerance of /- .001 inches unlessspecified otherwise. The state-of-the-artmanufacturing process assures that only a smallportion of the tolerance band is used, with processCpk's generally above 3.5. The result is muchhigher repeatability than commercial grade wearrings. This provides better control of seal extrusiongaps and reduction of cylinder or apparatusbending loads. MPI High Precision Wear Guidesare the better choice for demanding applications.MPI Wear Guides are available in two high strengthPolyimide materials; P-2551 and internallylubricated P-2552. See page 5 for physicalproperties. MPI can also provide wear guides inspecial service materials such as Bronze filledPTFE and Acetal. Contact MPI engineering forassistance with these more specialized materials.Precision Wear Guides assure minimumclearances and maximum bearing contact toeliminate deflection under load. When comparedto commercial grade rings, Macrotech WearGuides reduce seal extrusion clearancesignificantly.Q. Why choose WGT HighPrecision Wear Guides?A: Tighter wear guide thicknesscontrol assures less eccentricityand e-gap, meaning longer life.4
Deflection Under LoadRadial load vs. DeflectionDeflection.125 C/S Wear RingMaterial deflectionunder load forGlass-Filled Nylonat 160 F and 75 F.0.0035P-2552 @ 160 F0.003Deflection (inches)Recommended service zone0.0025P-2551 @ 160 F0.002P-2552 @ 75 F0.0015P-2551 @ 75 F0.0010.00050500100020003000400050006000Bearing Load (PSI)Materials Proper tiesTypical Physical PropertiesPropertyASTM TestP-2551P-2552Hardness, Rockwell RD-785120120Ultimate Elongation @ breakD-6382.5%2-3%Ultimate Tensile Strength, PSID-63825,00023,000Heat Deflection Temp. @ 66 PSID-648420ºF410 FHeat Deflection Temp. @ 264 PSID-648Impact Strength – Notched ft.lbs./in.D-2562.502.00Water Absorption, 24 hr @ 73 FD-5701.2%1.0%Flexural Strength, PSID-79039,00034,000Flexural Modulus, PSID-7901.4X1061.35X106Compressive Strength, PSID-68523,00020,000400ºF400 FPropertiesTypical physical propertiesfor both P-2551 & P-2552.P-2551 is for general dutyapplications while P-2552is for friction and/or wearsensitive applications.Also available in othermaterials such as bronzefilled PTFE, Acetal,UHMWPE and PEEK.Test information is based on specific conditions and limited sample size, and is only for general guidance. It doesnot supercede published data for the product. Customer must decide suitability for his purpose. Informationapplies at room temperature unless specified otherwise.5
Piston ApplicationRod ApplicationGroove Dimensions1.Subtract .001" from minimum bore (B min) to allow forovality and assembly clearance.Groove Dimensions1.Add .001" from maximum rod (R max) to allow forassembly.2.Subtract twice maximum Wear Guide thickness (T max).The result is the maximum groove diameter (G max).2.Add twice maximum Wear Guide thickness (T max). Theresult is the minimum groove diameter (D min).3.Subtract piston machining tolerance to obtain G min.3.Add machining tolerance to obtain D max.4.To G minimum, add twice minimum Wear Guide thickness(T min) to obtain minimum installed Wear Guide O.D.4.From D max, subtract twice the minimum Wear Guidethickness (T min) to obtain maximum installed Wear Ring I.D.5.Subtract twice minimum desired radial piston-to-boreclearance to obtain maximum piston diameter (P max).Subtract piston machining tolerance to obtain P min.5.Add twice the minimum desired radial rod-to-gland boreclearance to obtain minimum gland bore diameter (Hmin). Add gland machining tolerance to obtain H max.6.Groove Length (L) is equal to nominal Wear Guide width(W) plus .010/020.6.Groove length (L) is equal to nominal Wear Guide width(W) plus .010/020.Seal Extrusion GapMaximum seal extrusion gap (E max) without cylinder boreexpansion can be estimated by:Seal Extrusion GapMaximum seal extrusion gap (F max) for new assembly can beestimated by:E max B max - (G min T min P min - G min)E max (H max Dmax Hmax) - (T min R min)ExampleExample1.3.000 - .001 2.9991.1.500 .001 1.5012.2.999 - (2 X .125) 2.749 (G max)2.1.501 (2 X .125) 1.751 (D min)3.2.749 - .002 2.747 (G min)3.1.751 .002 1.753 (D max)4.2.747 (2 X .123) 2.9935.2.993 - (2 X .005) 2.983 (P max)2.983 - .002 2.981(P min)4.1.753-(2 X .123) 1.5075.6.500 (.010/.020) .510/520 (L)1.507 (2 X .005) 1.517 (H min) 1.517 .002 1.519(H max)6.500 .010/.020 .510/52022Example bore is 3.000/3.003. Wear Guide is .123/.125 thickand 1/2" wide. Piston machining tolerance is a total of .002.Minimum desired radial piston-to-bore clearance is .005.Seal Extrusion GapExample rod is 1.500 /1.499. Wear Guide is .123 / .125 thickand 1/2" wide. Rod Gland machining tolerance is a total of.002. Minimum desired rod-to-gland clearance is .005.Seal Extrusion Gap3.003 - (2.747 .123 2.981 - 2.747) .016"(1.519 1.753 - 1.519) - (.123 1.499) .014"22LWWLGPRBETTE100 minGroove Detail.024 R MAX.6HD
ROD SEALSPISTON S E A L SROD WIPERSUBR/ZBR SealL o c k i n g C a p p e d T- S e a lSH WiperHEAVY DUTYMOBILE HYDRAULICUnsymmetrical U-CUPHEAVY DUTYMOBILE HYDRAULICC a p p e d T- S e a l MOBILE HYDRAULICAGRICULTURALGENERAL INDUSTRIALTy p e B P o l y s e a lHEAVY DUTYMOBILE HYDRAULICGrooved Piston SealMOBILE HYDRAULICAGRICULTURALGENERAL INDUSTRIALD e e p Z- S e a lACCUMULATORSHEAVY DUTYMOBILE HYDRAULICGEN. MACHINEPTFE Piston SealHEAVY DUTYMOBILE HYDRAULICTELESCOPIC CYLINDERD e e p Z- S e a l w i t h D e l t a A n t i Extrusion RingAGRICULTURALHEAVY DUTYMOBILE HYDRAULICGEN. MACHINEPTFE Piston S-RingHEAVY DUTYMOBILE HYDRAULICHIGH PRESSURER Style Buffer SealMEDIUM OPERATIONMOBILE HYDRAULICCrown Seal LOW FRICTIONHEAVY DUTYMOBILE HYDRAULICRB Style Buffer SealAGRICULTURALHEAVY DUTYMOBILE HYDRAULICUnsymmetrical U-CupHEAVY DUTYMOBILE HYDRAULICHIGH PRESSUREAGRICULTURALGENERAL INDUSTRIALRS Style Buffer SealHEAVY DUTYMOBILE HYDRAULICSpectraseal PETRO-CHEMICALLOW FRICTIONEXTREME TEMPERATURESCORROSIVE FLUIDS7HEAVY DUTYMOBILE HYDRAULICMC WiperHEAVY DUTYMOBILE HYDRAULICH -W i p e rAGRICULTURALGENERAL CYLINDERMOBILE HYDRAULICD T-W i p e rGENERAL CYLINDERMOBILE HYDRAULICWEAR GUIDESWEAR GUIDESW G T We a r G u i d eHEAVY DUTYMOBILE HYDRAULICP T F E We a r G u i d eLOW FRICTIONGENERAL CYLINDERMOBILE HYDRAULICGENERAL INDUSTRIAL
Important NoticeWe reserve the right to make changes without notice inour products and in the information content of thisbrochure. The statements and information in the brochureare intended to serve only as guides. They are notwarranties or binding descriptions of the products.Requests for more information are welcome. In particular,we will be glad to provide samples for you to inspect andtest in your assemblies and plant before you make a finaldecision for your application.Notice of Exclusive Warranty and RemedyBriefly, our exclusive warranty is against defects inmaterials and workmanship at the time of shipment. It is inlieu of all other warranties. There is no implied warranty ofmerchantability or fitness for a particular purpose. Theexclusive remedy is replacement of defective products, orat our option, refund of their purchase price. All damagesexceeding the purchase price are excluded, whetherconsequential or otherwise and regardless of cause. Theterms and conditions on our printed quotation contain amuch more complete statement of our Exclusive Warrantyand Remedy.MACROTECH POLYSEAL, INC.Macrotech Polyseal, Inc.1750 West 500 SouthSalt Lake City, UT 84104(801)973-9171(801)973-9188 FAXCopyright 2003Macrotech Polyseal, Inc.Authorized MPI Distributor:
ROD SEALS PISTON SEALS ROD WIPERS UBR/ZBR Seal Locking Capped T-Seal SH Wiper HEAVY DUTY MOBILE HYDRAULIC HEAVY DUTY MOBILE HYDRAULIC HEAVY DUTY MOBILE HYDRAULIC Unsymmetrical U-CUP Capped T-Seal MC Wiper MOBILE HYDRAULIC AGRICULTURAL GENERAL INDUSTRIAL HEAVY D
Cost-Tolerance Trades: Supplier Expertise Tolerance Cost High precision, high cost process Design tolerance defines the process required; small changes in tolerance may allow alignment to lower cost processes; only suppliers will know if the cost-tolerance sensitivity is high Moderate precision, moderate cost process Low precision, low cost process
Literature on Tolerance Design The relationship between the functional requirements and entities of the mechanical part can be derived and expressed as F 1 ¼ fðE 1;E 2;.;E nÞ. Tolerance design consists of tolerance analysis and tolerance synthesis. In tolerance analysis, the goal is to ensure the tolerance of functional require-
Precision Air 2355 air cart with Precision Disk 500 drill. Precision Air 2355 air cart with row crop tires attached to Nutri-Tiller 955. Precision Air 3555 air cart. Precision Air 4765 air cart. Precision Air 4585 air cart. Precision Air 4955 cart. THE LINEUP OF PRECISION AIR 5 SERIES AIR CARTS INCLUDES: Seven models with tank sizes ranging from
5. Design tolerance practice 11 5.1 Variables affected by the tolerance design method 11 5.2 How generic tolerance engineering practice is applied 12 5.3 Thoughts on how tolerance design practices can be altered 14 5.4 Comparison to theoretical models 15 5.5 Evaluation of tolerance design practices 17 6. Conclusion 22 7. References 24
wear of insignia, wear of the shoulder sleeve insignia (current organization and former wartime service), and wear of the dress uniform insignia; adds wear of insignia on the old and new versions of the female blue and white coats, wear of the full-color U.S. flag cloth replica, and a new paragraph on the wear .
Lower Wear Pad L 204mm Doosan 9 - Lower wear pads. LOWER WEAR PADS CODE PART DESCRIPTION BRAND F11B01 Upper Wear Pad L 156mm Doosan Daewoo 8508376 Lower WearPad Class II L 160mm Hyster Yale 10 - Lower wear pads. MAST WEAR PADS AND HOOKS CODE PART DESCRIPTION BRAND 61356-23600-71 Mast Wear Pad
plant Stress tolerance of transgenic plants References AtCBF1/2/3 Brassica napus Constitutive overexpression enhanced both basal and acquired freezing tolerance (22) AtCBF1 Tomato Constitutive overexpression enhanced oxidative stress tolerance under chilling stress; enhanced tolerance to water-deficit stress (23, 24) AtDREB1A/ CBF3
Objective 5.2: Plan and implement VMware fault tolerance Identify VMware Fault Tolerance requirements Configure VMware Fault Tolerance networking Enable/Disable VMware Fault Tolerance on a virtual machine Test a Fault Tolerant configuration Determine use case for enabling VMware Fault Tolerance on a virtual machine