TORSIONAL COUPLINGS LM TORSIONAL COUPLING SELECTION 36 Use the following 3 steps in conjunction with the technical data and dimension tables contained in the following sections to make the preliminary coupling selection: 1) Application Torque Select a coupling size with a nominal torque rating (T KN) greater or equal to the application torque (T) calculated with the equation: T = kW* 9550/RPM provided T < Tkn*St1 where St1 is the temperature factor for nominal torque found from the chart on page 37. This number will typically be at least 0.6 or 0.7 for typical ambient temperature of at least 60°C to 70°C inside the flywheel housing. 2) SAE Flywheel Size Select the appropriate SAE J620 flange size to match your flywheel. 3) Shaft Dimensions Make sure maximum bore capacity of coupling will accomodate the dimensions of your driven shaft. Coupling hub length can usually be shortened if necessary to fit into tight space envelopes. Important Final selection of coupling size requires verification by torsional vibration analysis. This analysis will identify the location of critical speeds and confirm the absence of excessive steady-state and peak resonance conditions over the normal operating cycle of the equipment. LM couplings are robust, reliable and unique in their ability to solve torsional vibration problems in certain applications. But as with all torsional couplings, inappropriate coupling selection can lead to unstable conditions that place the coupling as well as the rest of the drive train at danger. We can perform the torsional vibration analysis for you if required. Complete the worksheet found on page 7 and fax it to jbj Techniques Limited technical office, fax: 01737 772041 or complete the on-line form at www.jbj.co.uk/torsional coupl ings. #DriveLineHarmony www.jbj.co.uk/torsional-couplings.html
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