? Type of input power (electrical motor, inner combustion engine with mechanical or hydraulic drive).
? Type of tools to be driven.
? Amount 
of horsepower expected to provide suffi cient electrical power to the driven shaft.
? Full load speed of the fastest working shaft (rpm).
? Desired velocity of the slow running shaft ( or the expected velocity ratio). NOTE: If speeds are variable figure out the horsepower to become transmitted at just about every speed.
? Diameters in the drive and driven shafts . . . This worth could restrict the minimal amount of teeth for that sprockets.
? Center distance of your shafts.
? Note the place and any area limitations that could exist. Ordinarily these limitations are around the greatest diameter of sprockets (this restricts using single strand chains) or the width of your chain (this restricts using multi-strand chains).
? Conditions with the drive such as a determination with the class of load (uniform, moderate or heavy), significant working temperatures or chemically aggressive environments ought to be mentioned.
Abbreviations Utilized in Equations
N Number of teeth around the significant sprocket.
n Amount of teeth to the smaller sprocket.
R Speed in revolutions per minute (rpm) in the massive sprocket.
r Speed in revolutions per minute (rpm) on the small sprocket.
C Shaft center distance in chain pitches.
HP Horsepower rating on the drive motor or engine.
KW Kilowatt electrical power rating of drive motor or engine if utilizing metric units.
SF Support Factor
