? Type of input electrical power (electric motor, inner combustion engine with mechanical or hydraulic drive).
? Type of equipment to become driven.
? Amount of horsepower required to supply suffi cient energy to your driven shaft.
? Full load speed with the quickest operating shaft (rpm).
? Desired velocity of the slow operating shaft ( or even the essential velocity ratio). NOTE: If speeds are variable figure out the horsepower to be transmitted at every single velocity.
? Diameters from the drive and driven shafts . . . This worth may well restrict the minimal amount of teeth for your sprockets.
? Center distance on the shafts.
? Note the place and any area limitations that could exist. Usually these limitations are around the optimum diameter of sprockets (this restricts using single strand chains) or the width of the chain (this restricts the usage of multi-strand chains).
? Conditions on the drive like a determination in the class of load (uniform, reasonable or heavy), severe working temperatures or chemically aggressive environments needs to be noted.
Abbreviations Utilized in Equations
N Quantity of teeth within the substantial sprocket.
n Variety of 
teeth within the modest sprocket.
R Speed in revolutions per minute (rpm) of the massive sprocket.
r Velocity in revolutions per minute (rpm) of the modest sprocket.
C Shaft center distance in chain pitches.
HP Horsepower rating of your drive motor or engine.
KW Kilowatt energy rating of drive motor or engine if using metric units.
SF Services Factor
