Horsepower calculation. Bearing
Horsepower calculation. Bearing
(OP)
When one using a bearing to drive a certain weight of material, do u just use the normal force multiply by the coefficent of friction and then use this force to figure out the torque?
I am using a bearing to drive some weight thru 6.67' distance, the bearing has pitch diameter of 3".
I obtained the following using the above info
FPM= 40
RPM= 51
Then here is the point I start getiing confused,
Force = coefficent of friction x weight
MY weight is 1500 lbs & coefficent of friction is 0.03
F = 1500 x 0.03 = 4.5 lbs
Then I use this force to figure out my torque
T = F x radius = 4.5 x .125 ft = .563 lb ft
and with that I figure horse power
HP = (.563 x 51)/ 5250 = .005 HP which seems really low to me...
Did I not do it correctly?





RE: Horsepower calculation. Bearing
Quando Omni Flunkus Moritati
RE: Horsepower calculation. Bearing
You are neglecting inertia.
RE: Horsepower calculation. Bearing
I use bearings to allow shafts to rotate with as low an amount of friction as possible....
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Horsepower calculation. Bearing
TTFN

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RE: Horsepower calculation. Bearing
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Horsepower calculation. Bearing
In some cases the torque of the seals is greater than the frictional
torque. The amount of clearance or whether it is preloaded causes
great variation as well. Is this a thrust or radial bearing, etc,
is it a roller, ball or pad bearing?
RE: Horsepower calculation. Bearing