? Type of input electrical power (electric motor, inner combustion engine with mechanical or hydraulic drive).
? Type of equipment for being driven.
? Amount of horsepower required to provide suffi cient power for the driven shaft.
? Full load pace of your fastest working shaft (rpm).
? Desired pace on the slow working shaft ( or the necessary velocity ratio). NOTE: If speeds are variable establish the horsepower for being transmitted at each speed.
? Diameters on the drive and driven shafts . . . This worth might restrict the minimal amount of teeth for that sprockets.
? Center distance with the shafts.
? Note the position and any area limitations that could exist. Normally these limitations are about the maximum diameter of sprockets (this restricts the use of single strand chains) or the width of your chain (this restricts the use of 
multi-strand chains).
? Conditions of the drive which includes a determination on the class of load (uniform, reasonable or heavy), significant operating temperatures or chemically aggressive environments should be mentioned.
Abbreviations Used in Equations
N Quantity of teeth over the huge sprocket.
n Quantity of teeth to the smaller sprocket.
R Pace in revolutions per minute (rpm) on the large sprocket.
r Speed in revolutions per minute (rpm) on the smaller sprocket.
C Shaft center distance in chain pitches.
HP Horsepower rating of the drive motor or engine.
KW Kilowatt energy rating of drive motor or engine if applying metric units.
SF Services Factor
