overhaul ball question

[FuzzyDiceGuy]

Hey everyone, I have a question. so, if you need about 210 pounds on that overhaul ball to keep the crane cable tight, would you need, like, 840 pounds on a four part (double sheave) setup?

How does that even work? Do most cranes have extra weights for this? Just a newbie operator here, trying not to mess up the cable! Cheers!

 

[Kurt Zamo]

Hey everyone, I have a question. so, if you need about 210 pounds on that overhaul ball to keep the crane cable tight, would you need, like, 840 pounds on a four part (double sheave) setup?

How does that even work? Do most cranes have extra weights for this? Just a newbie operator here, trying not to mess up the cable! Cheers!

Yep, you'd likely need around 840 pounds on a four-part line to get that same tension because each part of the cable shares the load.

 

[Blaqshades73]

No, you don't multiply the weight like that, the load on the overhaul ball doesn't scale linearly with the parts of line. If 210 lbs is what you need for a single line to keep tension, that same 210 lbs should still do the trick on a four part line, because the ball's weight is on the dead end side not divided across the sheaves like a load would be.

 

[Kurt Zamo]

No, you don't multiply the weight like that, the load on the overhaul ball doesn't scale linearly with the parts of line. If 210 lbs is what you need for a single line to keep tension, that same 210 lbs should still do the trick on a four part line, because the ball's weight is on the dead end side not divided across the sheaves like a load would be.

Hold on there, while the exact overhaul ball weight might not scale in a perfectly simple multiplication for every setup, you will definitely need a heavier ball for a four part line than the 210 pounds used for a single. That original 210 pounds just will not cut it with all the extra friction from more sheaves and more rope you are dealing with to keep things running right.