What happens when a pulley is not frictionless?
Now if the pulley is not frictionless (there is friction between the pulley and the cord), then the man must apply a greater force in order to support the box (because you are supporting the box and some of your force is dissipated due to friction) (the system here is also in equilibrium).
Why do people use pulleys to apply force?
There are several common reasons why this is done. If the force is being applied by a person, then the pulley enables them to apply force in a way that takes advantage of their biomechanics plus gravity. It is much easier to apply a downward force using your bodyweight than it is to apply the same force by pulling something upwards.
What does it mean when a pulley is suspended?
This pulley is suspended rather than fixed. This means that the rope on the left and right of the pulley are both lifting the 10kg load. They each lift half its weight, so the load is effectively split into two.
Why does the cord resting on a pulley not move?
The cord resting on the pulley, doesn’t have freedom of motion to move any way except tangential to the pulley at all points of contact because the points where any normal force occurs can’t move in a normal direction by the nature of the setup (as that would mean they sink into the pulley, move the pulley, or float off the pulley).
Is it dangerous to repair a V belt pulley?
Some pulleys turn at a very high rate of speed and any failures can be dangerous. Always error on the side of caution. With that said, this is the perfect type of repair to illustrate how useful hobby welding can be. It wasn’t a repair to any kind of structural support or critical assembly.
Can a welder repair a cast iron pulley?
Pulleys made of cast iron or aluminum require special welding equipment that is not covered in this article. And any repairs to the pulley surface that comes in contact with the belt itself should be evaluated by a professional welder. Some pulleys turn at a very high rate of speed and any failures can be dangerous.
How can I tell if my idler pulley is off?
With the pulley all the way to one side, it looked like the alignment was off far enough to allow the belt to come in contact with the edge of an idler pulley. Once we pulled the drive pulley off the shaft we clearly saw the issue.
Where is the auger on a V belt pulley?
The drive shaft runs inside a tube that supports it. At the other end of the shaft is a chain sprocket that drives the auger. Over time the end of the tube, supporting the shaft, had worn into the pulley creating a fairly deep groove. Increasingly getting worse until the belt started hitting the edge of the idler pulley.