? Type of input power (electric motor, internal combustion engine with mechanical or hydraulic drive).
? Type of tools to be driven.
? Amount of horsepower essential to provide suffi cient energy on the driven shaft.
? Full load pace with the fastest operating shaft (rpm).
? Desired pace on the slow working shaft ( or the required velocity ratio). NOTE: If speeds are variable ascertain the horsepower to become transmitted at each and every velocity.
? Diameters of your drive and driven shafts . . . This worth could restrict the minimum quantity of teeth for your sprockets.
? Center distance in the shafts.
? Note the position and any space limitations that may exist. Commonly these limitations are around the maximum diameter of sprockets (this restricts the usage of single strand chains) or the width in the chain (this restricts the use of multi-strand chains).
? Conditions on the drive such as a determination with the class 
of load (uniform, reasonable or heavy), severe working temperatures or chemically aggressive environments needs to be noted.
Abbreviations Used in Equations
N Variety of teeth within the huge sprocket.
n Number of teeth on the modest sprocket.
R Velocity in revolutions per minute (rpm) of the massive sprocket.
r Velocity in revolutions per minute (rpm) on the small sprocket.
C Shaft center distance in chain pitches.
HP Horsepower rating in the drive motor or engine.
KW Kilowatt energy rating of drive motor or engine if making use of metric units.
SF Service Factor
Needed Info For Drive Chain Selection
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