Precision Close Tolerance Wear Guides - Hi-Tech …

1 REV #102003 MACROTECH polyseal , Close ToleranceWear GuidesService, Solutions, PerformanceWGT-10002 Macrotech 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 diameters are available in othermaterials. Our ISO 9001 facility provides thesame repeatable quality for all polyseal has been producing highprecision wear Guides since 1990 and hasshipped over 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.

2 Consult with MPIengineering or customer service for Capacity3 Standard Part NumberingWGT-125 -500 StyleCrossSectionNominal ODNominalWidthExample: nominal size, ID x OD x .500 HTC/S thickness Tolerance : .123/.125 Metric Part NumberingMPS -080 -086 -050- StyleExample: nominal size, 80mm ID x 86 mm ODC/S thickness Tolerance : 3,00/2,95 AdvantagesInstallationPerformanceEasiest joint style to install in bearing stress at the difficult to install. Improves bearing stress at gapBetter resistance to contaminants &spike loadsWST style not available in 3/16 cross NumberingJoint StylesRecommended Radial Cross Section versus + ODCross sections of chart indicate thatinstallation may be more simple forblind rod glands.

3 An increased axiallength will increase complexity duringinstallation. Consult MPI engineeringfor specific concerns. Non-standard cross sections areavailable upon request. Consult MPIengineering for wear Guides smallerthan 1 nominal - Butt CutEasyMoreComplexWAT - Angle CutWST - Step CutEasyMoreComplexEasyMoreComplexGoodBes tGoodBestGoodBestMacrotech 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 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.

4 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 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 wear Guides are available in two high strengthPolyimide materials; P-2551 and internallylubricated P-2552.

5 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 wear Guides assure minimumclearances and maximum bearing contact toeliminate deflection under load. When comparedto commercial grade rings, Macrotech WearGuides reduce seal extrusion Choose Precision Close Tolerance wear Guides ?Q. Why choose WGT HighPrecision wear Guides ?A: Tighter wear guide thicknesscontrol assures less eccentricityand e-gap, meaning longer load vs. C/S wear Load (PSI)Deflection (inches)P-2552 @ 160 FP-2552 @ 75 FP-2551 @ 75 FP-2551 @ 160 FDeflection Material deflectionunder load forGlass-Filled Nylonat 160 F and 75 Physical PropertiesPropertyASTM TestP-2551P-2552 Hardness, Rockwell RD-785120120 Ultimate Elongation @ Tensile Strength, PSID-63825,00023,000 Heat Deflection Temp.

6 @ 66 PSID-648420 F410 FHeat Deflection Temp. @ 264 PSID-648400 F400 FImpact Strength Notched Absorption, 24 hr @ 73 Strength, PSID-79039,00034,000 Flexural Modulus, Strength, PSID-68523,00020,000 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 PropertiesDeflection Under LoadPropertiesTypical physical propertiesfor both P-2551 & is for general dutyapplications while P-2552is for friction and/or wearsensitive available in othermaterials such as bronzefilled PTFE, Acetal,UHMWPE and service zone6 Piston ApplicationGroove.

7 001" from minimum bore (B min) to allow forovality and assembly twice maximum wear guide thickness (T max).The result is the maximum groove diameter (G max). piston machining Tolerance to obtain G G minimum, add twice minimum wear guide thickness(T min) to obtain minimum installed wear guide twice minimum desired radial piston-to-boreclearance to obtain maximum piston diameter (P max).Subtract piston machining Tolerance to obtain P Length (L) is equal to nominal wear guide width(W) plus .010 Extrusion GapMaximum seal extrusion gap (E max) without cylinder boreexpansion can be estimated by:E max = B max - (G min + T min + P min - G min)ExampleExample bore is wear guide is .123/.125 thickand 1/2" wide. Piston machining Tolerance is a total of.

8 Desired radial piston-to-bore clearance is . - .001 = - (2 X .125) = (G max) - .002 = (G min) + (2 X .123) = - (2 X .005) = (P max) - .002 = (P min) + (.010/.020) = .510/520 (L)Seal Extrusion - ( + .123 + - ) = .016"Rod ApplicationGroove .001" from maximum rod (R max) to allow twice maximum wear guide thickness (T max). Theresult is the minimum groove diameter (D min). machining Tolerance to obtain D D max, subtract twice the minimum wear Guidethickness (T min) to obtain maximum installed wear Ring twice the minimum desired radial rod-to-gland boreclearance to obtain minimum gland bore diameter (Hmin). Add gland machining Tolerance to obtain H length (L) is equal to nominal wear guide width(W) plus.

9 010 Extrusion GapMaximum seal extrusion gap (F max) for new assembly can beestimated by:E max = (H max + Dmax + Hmax) - (T min + R min)ExampleExample rod is wear guide is .123 / .125 thickand 1/2" wide. Rod Gland machining Tolerance is a total Minimum desired rod-to-gland clearance is . + .001 = + (2 X .125) = (D min) + .002 = (D max) (2 X .123) = +(2 X .005) = (H min) + .002 = (H max) +.010/.020 = .510/520 Seal Extrusion Gap( + - ) - (.123 + ) = .014" R inm Groove Detail7 ROD SEALSPISTONSEALSROD WIPERSUBR/ZBR SealLocking Capped T-SealSH Wiper HEAVY DUTYMOBILE HYDRAULICHEAVY DUTYMOBILE HYDRAULICHEAVY DUTYMOBILE HYDRAULICU nsymmetrical U-CUPC apped T-Seal MC WiperMOBILE HYDRAULICAGRICULTURALGENERAL INDUSTRIALHEAVY DUTYMOBILE HYDRAULICHEAVY DUTYMOBILE HYDRAULICType B PolysealGrooved Piston SealH-WiperMOBILE HYDRAULICAGRICULTURALGENERAL INDUSTRIALACCUMULATORSHEAVY DUTYMOBILE HYDRAULICGEN.

10 MACHINEAGRICULTURALGENERAL CYLINDERMOBILE HYDRAULICDeep Z-SealPTFE Piston SealDT-Wiper HEAVY DUTYMOBILE HYDRAULICTELESCOPIC CYLINDERAGRICULTURALHEAVY DUTYMOBILE HYDRAULICGEN. MACHINEGENERAL CYLINDERMOBILE HYDRAULICDeep Z-Seal with Delta Anti-Extrusion RingPTFE Piston S-RingWEAR GUIDESHEAVY DUTYMOBILE HYDRAULICHIGH PRESSUREMEDIUM OPERATIONMOBILE HYDRAULICR Style Buffer SealCrown Seal WGT wear GuideLOW FRICTIONHEAVY DUTYMOBILE HYDRAULICAGRICULTURALHEAVY DUTYMOBILE HYDRAULICHEAVY DUTYMOBILE HYDRAULICRB Style Buffer SealUnsymmetrical U-CupPTFE wear GuideHEAVY DUTYMOBILE HYDRAULICHIGH PRESSUREAGRICULTURALGENERAL INDUS-TRIALLOW FRICTIONGENERAL CYLINDERMOBILE HYDRAULICGENERAL INDUSTRIALRS Style Buffer SealHEAVY DUTYMOBILE HYDRAULICS pectraseal PETRO-CHEMICALLOW FRICTIONEXTREME TEMPERATURESCORROSIVE FLUIDSWEAR GUIDESI mportant NoticeWe reserve the right to make changes without notice inour products and in the