Page 18 of LambdaŽ Chain Brochure by U.S. Tsubaki

step 4 determine the number of teeth for the small sprocket use table ii to obtain the approximate chain size and the number of teeth for the small sprocket compare this information to the drive lambdaŽ horsepower ratings tables and determine if drive lambda is appropriate for the speed and horsepower of the application select the proper chain type chain size and sprocket size refer to the number of revolutions of the high speed shaft the driving shaft when the speed is reduced the driven shaft when the speed is increased and the design hp value for smoother chain drive a smaller pitch is suggested if a single strand chain does not satisfy the transmission requirements use a double strand chain if there are space limitations a double strand chain with a smaller pitch may be used step 6 determine the number of teeth for the large sprocket multiply the number of teeth for the small sprocket by the speed ratio more than 15 teeth is suggested the number of teeth on the large sprocket should be less than 120 by reducing the number of teeth for the small sprocket the number of teeth for the large sprocket can be reduced basic formula for chain drive 1 chain speed s sft/min p ˇ n ˇ n 12 where p chain pitch inch n number of teeth/sprocket n revolutions per minute rpm 2 chain tension t tlbs 33,000 x hp s where s chain speed ft/min hp horsepower to be transmitted hp 3 number of pitches of chain l l n1 n2 2c n2 n1 /6.28 2 c 2 step 5 check the dimensions of the sprockets after determining the number of teeth necessary for the small sprocket refer to the sprocket dimension tables to check if the sprocket diameter satisfies the space limitation selection guidelines drive lambdaŽ where n1 number of teeth on large sprocket n2 number of teeth on small sprocket c distance between shafts expressed in number of links 17

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