Finding Torque on a Roll
Finding Torque on a Roll
(OP)
I have a roll that is currently free wheeling to a stop. We are in process of sizing a belt to have this stop a bit quicker. The belt manufacturer wants to know max/min torque on the roll.
How should I go about getting this?
How should I go about getting this?





RE: Finding Torque on a Roll
Regards,
Cory
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RE: Finding Torque on a Roll
RE: Finding Torque on a Roll
The cylinder will have a kinetic energy when its rotating. To stop it it will take an equal amount of energy. The size of the torque to apply to stop it will depend on how fast you want it to stop. Unfortunately I dont have my Physics handbook here and I dont remember the equations in my head. If you want I can write it out later.
RE: Finding Torque on a Roll
You could estimate the torque required to slow the roll down
by angular momentum and impulse theory although this will only give you the average torque required and not the the max or min you requested.
the formula:-
T=Iα
where
α= average angular acceleration = Wi-Wf/t
I= moment of inertia of roll
T= Torque
Wi= initial angular velocity
Wo= final angular velocity
t= time required to stop roll rotating
So in your case Wi would be the initial speed the roll free
wheels and Wo would be zero, t would be the time required or
desired to stop the roll.
regards
desertfox
RE: Finding Torque on a Roll