COUPLINGS - Rainbow Precision Products, Inc.

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ELASTOMERIC ELEMENT COUPLINGSCOUPLINGS• Torsional softness (absorbs shock and vibration)• Allows angular misalignment between shafts• Used for most industrial applicationsGENERAL CHARACTERISTICSStarflex 4-Flex MaskaflexTorque (in.lbs) 3.5 - 6 228 60 - 47 268 900 - 82 500Max. HP/100 RPM 9.9 18 130.9Torsional wind-up (deg.) - 7° - 15° 3° - 7°Angular misalignment (deg.) 1/2° - 1° 1/4°-1° 4°Parallel misalignment (inch.) 0.010 - 0.015 0.010 - 0.040 0.047 - 0.203Axial permissiveness - limited compressibility 0.063" - 0.266"Sizes available 035 - 225 3 - 13* 50 - 200Elements availableNitrile Rubber (NBR)UrethaneHytrelBronzeEPDMHytrelNatural Rubber (NR)COUPLINGS* Sizes 11-13 in progress125FOR DEPENDABLE DRIVE COMPONENTS,
ELASTOMERIC ELEMENT COUPLINGSMASKA FLEXIBLE COUPLING SELECTIONFOR ALL MASKA COUPLING TYPESSelection Process:We will present two different ways of selecting the proper coupling -- namely, the torque designand the HP design.1. Determine the appropriate Coupling Series and Element materialUsing the General Characteristics chart (p. xx), determine which coupling series would be moreappropriate for your application. From this information, you may have to choose the properelement material according to the related Element Characteristics chart (Starflex pg.132;4-Flex pg.151).2. Determine the appropriate Service FactorUsing the Application Service Factors chart (p. XX) and the Driver Service Factor Adderschart (p. YY), determine the Service Factor that corresponds the closest to your application.3. a) Determine the Torque DesignTorque Design = (HP x Service Factor x 63025)RPM3 b) Determine the HP Design per 100 RPMHP per 100 RPM = (HP x Service Factor x 100)RPM4 Select the Coupling SizeUsing the Coupling Ratings & Misalignment charts, locate either the Torque or the HP per 100RPM columns. As the service factor has already been considered, use the chart with a servicefactor of 1. Skim this column to the first entry where the torque value or the HP per 100 RPMvalue is greater or equal to the value calculated in step 3. Once this value is located, refer to thecorresponding coupling size in the first column of the chart. Refer to the Maximum RPM andMisalignment values to validate that the application requirements are met. If the requirements arenot met at this point, another coupling type may be required for the application. Contact ourtechnical support for assistance, if needed.5. Verify the driver/driven shaft sizesUsing the proper coupling Dimensions chart, verify that your driver and driven shaft dimensionsare smaller or equal to the maximum bore size available on the coupling selected. If the couplingbore size is not large enough for the shaft diameter, select the next largest coupling that will fitthe driver/driven shaft diameter.COUPLINGSSELECTION EXAMPLE:A coupling is needed to join a 5 HP electric high torque motor operating at 1750 RPM to anoutdoor agricultural belt conveyor. The shaft size of the motor is 1 1/8" and the conveyor is1 3/16".1. Determine the appropriate Coupling Series and Element materialAccording to the General Characteristics chart, the proper series to use would be the MASKASTARFLEX to get the smallest back lash. According to the Element Characteristics chart,Urethane would probably be the best choice for this application.126BE SURE TO SPECIFY
Page 1: COUPLINGS
Page 8 and 9: STARFLEX COUPLINGSMASKA STARFLEX:EL
Page 10 and 11: STARFLEX COUPLINGSGENERAL ORDERING
Page 13 and 14: STARFLEX COUPLINGSMETRIC SERIES: ST
Page 15 and 16: STARFLEX COUPLINGSHYTREL - ELEMENT
Page 17 and 18: STARFLEX COUPLINGSNBR - MASKA STARF
Page 19 and 20: STARFLEX COUPLINGSURETHANE - MASKA
Page 21 and 22: STARFLEX COUPLINGSHYTREL - ELEMENT
Page 23 and 24: 4-FLEX COUPLINGSGeneral Characteris
Page 25 and 26: TYPE “S” COUPLING FLANGENote: C
Page 27 and 28: TYPE “B” COUPLING FLANGEIMPORTA
Page 29 and 30: 4-FLEX COUPLINGSEPDM ELEMENT - TYPE
Page 31 and 32: 4-FLEX COUPLINGSCOUPLING SECTION -
Page 33 and 34: MASKAFLEXELASTOMERIC TIRE TYPEMASKA
Page 35 and 36: MASKAFLEX COUPLINGSCROSS REFERENCES
Page 37 and 38: MASKAFLEX COUPLINGSCOUPLING RATINGS
Page 39: MASKAFLEX COUPLINGSHP1750 RPM MOTOR

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