Torque

I've no work to do today,I'm home alone ,So i can refresh my mind with your homework

only one question ,What is cylinder color

Power on one "small" roller will possibly not turn the unit. Start over. Use more bearings, "rollers", and a chain drive around the cyl. Use hydraulic drive. Look up drying oven design. Feel free to turn this in as your answer.

1- the ratio roller diam/drum diam is too small

2- torque depends on roller design (type of bearings a.s.o.) and distance between rollers

3- 1 roller is not good it could slide better at least 2 roller coupled to have them run at same speed.

Make a trial to solve the problem as you can and show your results they will be corrected. Making your work is not CR4 philosophy. I did it once and I had not even a thank you in response.

i had tried lot before asking someone.............

i had found the reaction on roller by using LAMI'S THEOREM. but reaction is radial force but i want tangential force so that so multiply it by radius & i get d torque.........

but i m unable 2 find tangential force..........

thanks for taking interest in my problem.........

Use a chain drive. What kind of bearings are you using?

So, why is an empty cylinder weighing 80 tons and filled with nothing other than fresh air expected to rotate at all? What is the process going on that needs a rotating cylinder?

Some examples of data that has not been shared that will impact on the choice of motor power:

• It seems to be about the same size as the cylinder in a small pulverising mill, so the answer on motor horsepower would depend on how much material is in there, its initial size, how many pulverisers are in there, how fast it is going, etc.
• However, this is stated as being a vertical cylinder on 4 rollers. There will be some drag at the interface between the base of the cylinder and the rollers that will be reduced if the rollers are conical and aligned correctly. The forum is told nothing about the bearing at the centre, nor the speed of rotation, nor what happens to anything that is inside the device. Were it to be a large centrifuge for separating solids from liquids at high angular velocity it would require different motor power than if it were, oh, say a rotating advertising stand doing 0.3 revolutions per minute.

Until something about what the cylinder is expected to do can be shared with the forum, the answers to both questions are indeterminate.

Is there a field trial that can be carried out locally, using pilot-scale equipment?

For guidance, the motor that rotates the restaurant at the top of the British Telecom tower in London, UK, is of the order of 1/2hp. Then, the restaurant rotates at something like once every 30min; most of the losses are in the gearbox and in the draught-seals, one might suspect.