217 GD-5 Selection Process The following information is necessary when making a Grid coupling selection: ■■Description of motor or engine, the horse power (or KW), and RPM at slowest coupling speed while under load ■■Description of the driven equipment ■■Shaft and keyway sizes and the type of fit for driver and driven equipment (clearance or interference)** ■■Shaft separation (BSE) ■■Physical space limitations (see Application Worksheet) ■■Determine what the environmental conditions will be, such as temperature, corrosive conditions, interference from surrounding structures, etc. ** By default, sizes 1020 – 1090 will be clearance fit, sizes 1100 – 1200 will be interference fit. ** Lovejoy machines all bores and keyways to meet the dimensional and tolerance specifications per ANSI/AGMA 9002-B04 for inch bores, or ISO 286-2 for metric bores. Typical grid couplings consist of two grid hubs, a grid spring, and a cover assembly. When the shaft separation requires a spacer style coupling, the coupling will consist of two shaft hubs, two spacer hubs, a grid spring, and a horizontal cover assembly. The following charts are available to assist in making the best possible grid coupling selection: ■■Coupling Selection Worksheet, Page GD-9 ■■Grid Standard Interchange Chart, Page GD-15 ■■Application Service Factors, Pages GD-7 and GD-8 ■■General Service Factors, Page GD-6 (bottom) ■■Performance and Dimensional Page GD-10 thru GD-11 Data for Standard Grid Couplings ■■Performance and Dimensional Page GD-12 Data for Spacer Grid Couplings ■■Grid Coupling Part Numbers Page GD-16 thru GD19 for Standard Components Formulas Used To Calculate Torque: Application Torque (in-lbs) = ( horse power x 63025 ) RPM Application Torque (Nm) = ( horse power x 9550 ) RPM Selection Torque = Application Torque x Service Factor High Peak Loads and Brake Applications For applications where high peak loads or high braking torques might be present, the following additional information will be necessary: ■■System peak torque and frequency ■■Duty cycle ■■Brake torque rating The selection torque formula is similar to the formula shown above except that the application torque should be doubled prior to applying the service factor. Application Torque (in-lbs) = ( horse power x 63025 ) RPM Application Torque (Nm) = ( horse power x 9550 ) RPM Selection Torque = 2 x Application Torque x Service Factor Please feel free to contact Lovejoy Application Engineering or Technical Support for assistance with additional grid coupling questions. Step 1: Determine the application torque using the formula shown above. Step 2: Select the Service Factor from the charts on pages GD-7 and GD-8. For applications not displayed use the chart shown to the right. Determine the Selection Torque using the formula shown above. Step 3: Using the selection torque as calculated, refer to the Performance Chart on page GD-10 to determine the minimum size grid coupling that will accommodate the torque. Step 4: Compare the maximum bore for the size selected and ensure the required bore sizes do not exceed the maximum allowable. If the required bore size is larger, step up to the next size coupling and check to see if the bore sizes will fit. Step 5: Using the selected coupling size, compare the bore and keyway sizes with the charts located on pages GD-16 thru GD-17 for UPC part numbers. Step 6: Contact your local industrial supplier with the part numbers to place your order. See the Selection Example process on the next page. Grid Coupling Selection Process JW JIS CJ SF MC G HP GD D T SP UJ VSD R SLD ED JW JIS CJ SF MC G HP GD D T SP UJ VSD R SLD ED Steps In Selecting A Grid Coupling www.jbj.co.uk/gridcouplings.html
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