? Type of input energy (electrical motor, internal combustion engine with mechanical or hydraulic drive).
? Type of equipment to get driven.
? Amount of horsepower necessary to supply suffi cient electrical power on the driven shaft.
? Full load velocity in the fastest operating shaft (rpm).
? Desired speed from the slow running shaft ( or even the essential velocity ratio). NOTE: If speeds are variable establish the horsepower to be transmitted at every speed.
? Diameters of your drive and driven shafts . . . This worth may possibly restrict the minimal variety of teeth to the sprockets.
? Center distance of your shafts.
? Note the position and any area limitations that could exist. Typically these limitations are around the highest diameter of sprockets (this restricts the use of single strand chains) or the width with the chain (this restricts the usage 
of multi-strand chains).
? Conditions with the drive which includes a determination in the class of load (uniform, reasonable or heavy), extreme working temperatures or chemically aggressive environments need to be mentioned.
Abbreviations Used in Equations
N Variety of teeth around the large sprocket.
n Amount of teeth around the modest sprocket.
R Velocity in revolutions per minute (rpm) from the significant sprocket.
r Speed in revolutions per minute (rpm) on the modest sprocket.
C Shaft center distance in chain pitches.
HP Horsepower rating of the drive motor or engine.
KW Kilowatt power rating of drive motor or engine if working with metric units.
SF Service Factor
