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Hi all,
I need to build a system to lift something heavy, for the moment I most likely will use this design https://en.wikipedia.org/wiki/Block_and_tackle#/media/File:Pulley3a.svg with 4 pulleys.
Let's say I need to lift 600 lbs weight in total, I buy 4 sheaves and 1 rope for this purpose. Each sheave has 500 lbs safe working load, and rope has 250 lbs safe working load.
I think my sheave should be strong enough, but I am not very positive about the rope in this case. If my understanding is correct the force I need to pull the 600 lbs weight is 150 lbs, does it mean as long as the rope is strong enough for 150 lbs it should do the work? Or the rope should be strong enough for entire 600 lbs weight?
Thanks!
I need to build a system to lift something heavy, for the moment I most likely will use this design https://en.wikipedia.org/wiki/Block_and_tackle#/media/File:Pulley3a.svg with 4 pulleys.
Let's say I need to lift 600 lbs weight in total, I buy 4 sheaves and 1 rope for this purpose. Each sheave has 500 lbs safe working load, and rope has 250 lbs safe working load.
I think my sheave should be strong enough, but I am not very positive about the rope in this case. If my understanding is correct the force I need to pull the 600 lbs weight is 150 lbs, does it mean as long as the rope is strong enough for 150 lbs it should do the work? Or the rope should be strong enough for entire 600 lbs weight?
Thanks!