rope wrap on object and friction
rope wrap on object and friction
(OP)
The concept that I'm looking at is very simple but I'm want to put the numbers to it. If you wrap a rope around a pipe to hold a weight is there a formula to calculate the number of wraps resulting in the required holding force. I know I've use this many times in life but now it's time to put some numbers to it.





RE: rope wrap on object and friction
Relates the in and out tension where
μ is the coefficient of friction between the rope and pipe and θ is wrap angle in radians.
RE: rope wrap on object and friction
Note satchmo's formula requires T in. After a few wraps the load can be stopped pretty easy with slight drag on the free end of the rope. 5 wraps of a rope with
? = 0.1 solves to more than 20>1 retarding ratio
RE: rope wrap on object and friction
Some ropes are manufactured to maximise friction others to minimise it. Also the weave of the rope would come into play (3-strand, 5-strand, platt, etc).
Another problem is the diameter of the pipe versus the diameter of the rope. Also are you assuming the rope is always perpindicular to the pipe axis
RE: rope wrap on object and friction
RE: rope wrap on object and friction
RE: rope wrap on object and friction
can you supply link to article?
RE: rope wrap on object and friction
http://news.sulekha.com/nlink.aspx?cid=288876
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You can read the details as a news item in these links.
RE: rope wrap on object and friction