# Stopping a rotating cylinder

1. Nov 16, 2009

### billinr

The issue I have is in a system design where I need to find the torque requirement to stop and reverse direction on a spinning cylinder of water (laundry wash machine). The system data I have:
1. The problem statement, all variables and given/known data
Water filled cylinder, 564mm diameter
Given weight of load is 170lbs
Spinning at 95 RPM for 1 second, decelerate for 0.25 seconds, reverse direction to 95 RPM
Repeat
Drive Pulley (where torque is applied) is 250mm diameter

2. Relevant equations

T=@I
Where T= torque, @=angular accel, I=inertia (?)

3. The attempt at a solution
Couldn't say because I really have no idea. (this was far from my strong classes many years ago!!)
The force of the spinning drum pushes the drive belt along, and causes it to slip on the motor. I am tasked with finding the correct belt to compensate for the load. I am able to develop the belt mechanics, but I am lost on how to find the forces on the pulley resulting from the moving drum load.

Any help in finding this value would be appreciated