? Type of input power (electric motor, internal combustion engine with mechanical or hydraulic drive).
? Type of gear to be driven.
? Amount of horsepower essential to provide suffi cient energy for the driven shaft.
? Full load pace with the fastest operating shaft (rpm).
? Desired pace on the slow working shaft ( or the required pace ratio). NOTE: If speeds are variable establish 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 the sprockets.
? Center distance from the shafts.
? Note the position and any space limitations that 
may exist. Normally these limitations are on the maximum diameter of sprockets (this restricts the usage of single strand chains) or the width from 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 around the big sprocket.
n Number of teeth on the modest sprocket.
R Velocity in revolutions per minute (rpm) of your massive sprocket.
r Velocity in revolutions per minute (rpm) on the compact sprocket.
C Shaft center distance in chain pitches.
HP Horsepower rating from the drive motor or engine.
KW Kilowatt energy rating of drive motor or engine if utilizing metric units.
SF Service Factor
