i have a roll dia aprox.43 inches and gear box ratio is 14.3.so my question is

i have a roll dia aprox.43 inches and gear box ratio is
14.3.so my question is how was decide the kw rating of
motor.

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i have a roll dia aprox.43 inches and gear box ratio is 14.3.so my question is how was decide the ..

First you buy a torque wrench. Then with the wrench you
turn the gear box at the speed you want the roll to go.
Then go here
http://www.engineeringtoolbox.com/electrical-motors-torques-
d_651.html

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