? Type of input electrical power (electric motor, internal combustion engine with mechanical or hydraulic drive).
? Type of equipment to be driven.
? Amount of horsepower expected to supply suffi cient electrical power for the driven shaft.
? Full load velocity with the fastest running shaft (rpm).
? Desired speed of the slow operating shaft ( or even the essential pace ratio). NOTE: If speeds are variable determine the horsepower to be transmitted at each and every velocity.
? Diameters of the drive and driven shafts . . . This value might restrict the minimal number of teeth to the sprockets.
? Center distance with the shafts.
? Note the position and any area limitations that could exist. Generally these limitations are about the maximum diameter of sprockets (this restricts the usage of single strand chains) or even the width in the chain (this restricts using multi-strand chains).
? Conditions from the drive including a determination in the class of load (uniform, moderate or hefty), severe operating temperatures or chemically aggressive environments must be noted.
Abbreviations Utilized in Equations
N Number of teeth around the huge sprocket.
n Quantity of teeth about the small sprocket.
R Speed in 
revolutions per minute (rpm) on the massive sprocket.
r Speed in revolutions per minute (rpm) in the smaller sprocket.
C Shaft center distance in chain pitches.
HP Horsepower rating of your drive motor or engine.
KW Kilowatt electrical power rating of drive motor or engine if utilizing metric units.
SF Service Factor
