? Type of input power (electric motor, internal combustion engine with mechanical or hydraulic drive).
? Type of equipment for being driven.
? Amount of horsepower demanded to supply suffi cient energy to the driven shaft.
? Full load speed on the fastest running shaft (rpm).
? Desired pace in the slow running shaft ( or the expected velocity ratio). NOTE: If speeds are variable figure out the horsepower to become transmitted at every single speed.
? Diameters on the drive and driven shafts . . . This value may well restrict the minimum variety of teeth for the sprockets.
? Center distance from the shafts.
? Note the position and any area limitations that may exist. Normally these limitations are around the optimum diameter of sprockets (this restricts the usage of single strand chains) or even the width with the chain (this restricts the use of multi-strand chains).
? Conditions in the drive like a determination on the class of load (uniform, reasonable or heavy), severe working temperatures or chemically aggressive environments really should be noted.
Abbreviations Used in Equations
N Amount of teeth over the substantial sprocket.
n Quantity of teeth around the little sprocket.
R Speed in revolutions per minute (rpm) from the large sprocket.
r Speed in revolutions per minute (rpm) from the modest sprocket.
C Shaft center 
distance in chain pitches.
HP Horsepower rating of the drive motor or engine.
KW Kilowatt power rating of drive motor or engine if making use of metric units.
SF Service Factor
