? Type of input power (electric motor, internal combustion engine with mechanical or hydraulic drive).
? Type of gear for being driven.
? Amount of horsepower necessary to supply suffi cient power to your driven shaft.
? Full load velocity in the fastest working shaft (rpm).
? Desired speed in the slow working shaft ( or even the needed pace ratio). NOTE: If speeds are variable figure out the horsepower to be transmitted at each and every velocity.
? Diameters of your drive and driven shafts . . . This worth may restrict the minimum number of teeth for your sprockets.
? Center distance with the shafts.
? Note the position and any area limitations that may exist. Commonly these limitations are to the maximum diameter of sprockets (this restricts the usage of single strand chains) or the width of your chain (this restricts using multi-strand chains).
? Conditions of the drive which includes a determination on the class of load (uniform, moderate or hefty), significant operating temperatures or chemically aggressive environments needs to be mentioned.
Abbreviations Utilized in Equations
N Variety of teeth over the large sprocket.
n Number of teeth on the modest sprocket.
R Velocity in revolutions 
per minute (rpm) with the substantial sprocket.
r Velocity in revolutions per minute (rpm) from the tiny sprocket.
C Shaft center distance in chain pitches.
HP Horsepower rating on the drive motor or engine.
KW Kilowatt power rating of drive motor or engine if making use of metric units.
SF Services Factor
