? Type of input power (electric motor, inner combustion engine with mechanical or hydraulic drive).
? Type of gear to be driven.
? Amount of horsepower demanded to provide suffi cient energy to the driven shaft.
? Full load speed with the quickest running shaft (rpm).
? Desired pace with the slow working shaft ( or even the demanded velocity ratio). NOTE: If speeds are variable ascertain the horsepower to become transmitted at each velocity.
? Diameters of your drive and driven shafts . . . This value may restrict the minimal number of teeth for your sprockets.
? Center distance on the shafts.
? Note the place and any room limitations that could exist. Usually these limitations are about the highest diameter of sprockets (this restricts using single strand chains) or even the width with the chain (this restricts the usage of multi-strand 
chains).
? Conditions with the drive including a determination in the class of load (uniform, reasonable or hefty), serious operating temperatures or chemically aggressive environments ought to be noted.
Abbreviations Used in Equations
N Quantity of teeth on the significant sprocket.
n Number of teeth about the compact sprocket.
R Velocity in revolutions per minute (rpm) from the big sprocket.
r Speed 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 electrical power rating of drive motor or engine if making use of metric units.
SF Service Factor
