Calculate the pressure on a reel/drum
Calculate the pressure on a reel/drum
(OP)
I have this winch-reel (540mm wide, Diameter=800mm, cylinderer wall thickness=10mm) that is to be pulled by a wire. The maximum braking load on the winch is 4.3 metric tonnes (42kN).
My task is to check the reel against buckling. I can determine the buckling if I know the relevant pressure on the reel/cylinder wall.
How can I determine the design pressure on the reel if only the braking load is known?
My task is to check the reel against buckling. I can determine the buckling if I know the relevant pressure on the reel/cylinder wall.
How can I determine the design pressure on the reel if only the braking load is known?






RE: Calculate the pressure on a reel/drum
I would tend to assume that the maximum braking load is also the maximum tension on the wire (or cable).
From the tension on the cable, you can get very easily the force of the cable against the reel and therefore the pressure.
RE: Calculate the pressure on a reel/drum
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Calculate the pressure on a reel/drum
I agree that each layer would add more compressive load on the reel. But I would also gather that this pressure isnt constant or equal for each layer. So a simple addition of (layers x force per layer) may be wrong? I would guess that the latest layer would carry most force - but that is only a guess.
I would also guess that the load distribution around the reel isnt constant either. Any tip on anyone having a study or formulas for wire/cable problems would be appreciated!
RE: Calculate the pressure on a reel/drum
The important parameters I found were the coefficient of friction of the cable, and the ratio of the radial to axial stiffness of the cable, and the radial stiffness of the cable and the reel.
In my case, from memory, I found that the load on the reel did not increase after we got 7 layers on there. However that was a pretty unusual cable.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Calculate the pressure on a reel/drum
Regards