Pulley system composition – a systematic approach (2020)
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Pulley system composition – a systematic approach (2020)
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Re: Pulley system composition – a systematic approach (2020)
#2Pulleys are one of those things you never realize you need until you learn about them. Then, you suddenly understand just how useful they can be. Understanding the basics of rope rigging, pulleys, and mechanical advantage has made my life so much easier. Whether it's camping, hanging hammocks and tarps, using a pulley system to pull out tree stumps, securing things to my bike or pickup truck, or carrying a lot of gear at once, all of this becomes much simpler once you grasp the fundamentals of pulleys.
I honeslty think this should be taught in school, not just in physics classes, but as part of some kind of a "Life 101" course.
Re: Pulley system composition – a systematic approach (2020)
#3They are forgetting that pulleys can be coaxial.
Re: Pulley system composition – a systematic approach (2020)
#4Pulleys are one of those things you never realize you need until you learn about them. Then, you suddenly understand just how useful they can be. Understanding the basics of rope rigging, pulleys, and mechanical advantage has made my life so much easier. Whether it's camping, hanging hammocks and tarps, using a pulley system to pull out tree stumps, securing things to my bike or pickup truck, or carrying a lot of gea…
Kind of like knots...
Re: Pulley system composition – a systematic approach (2020)
#5Pulleys are one of those things you never realize you need until you learn about them. Then, you suddenly understand just how useful they can be. Understanding the basics of rope rigging, pulleys, and mechanical advantage has made my life so much easier. Whether it's camping, hanging hammocks and tarps, using a pulley system to pull out tree stumps, securing things to my bike or pickup truck, or carrying a lot of gea…
Kind of like knots...
Pulleys and knots can go hand in hand.
With ropes you can start with a basic loop that acts as a pulley. Butterfly, wireman's loop, farmers something - I forget the names.
But you basically create a loop that let's you double back your rope. With a lot of modern rope they are slippery enough you get pretty good mechanical advantage. Some folks then go to a taught line hitch or something to even keep things adjustable basically. Key is usually to give yourself enough space to tighten, and I skip the taughtline hitch in most cases.
Re: Pulley system composition – a systematic approach (2020)
#6I was waiting for the mathematical abstraction or software analogy; obviously, there's some composition going on.
Re: Pulley system composition – a systematic approach (2020)
#7If the author reads this, since it's from 2020. The author appears to be currently investigating knot physics and drop tests.
However, the author does not "appear" to have the Luff Tackle variation. [1] I think it's close to the 6:1 variation on row two, except with the pulley directly attached to the ceiling.
The systematic approach seems to work, just appears to be missing a few combinations, or it was not really systematic. Such as, their should probably be a lot of pulley combinations that are basically "nothing", or "not helpful" combinations. 1:1, or 1/2:1, ect... combinations that just noted as discarded (or maybe curiosities that "might" have a use)
A 1:1 pulley is not "technically" significant from this perspective, yet it does change the force direction.
[1] https://en.wikipedia.org/wiki/Pulley#Method_of_operation
Re: Pulley system composition – a systematic approach (2020)
#8A differential hoist [0], while not really a pulley system, is a quite interesting simple machine, which can generate infinite mechanical advantage. It has two sprockets which are connected on the same shaft. A chain loops through both of them in opposite directions so that the other wheel is feeding and other is pulling, and the load moves only by the difference of the wheel diameters.
Re: Pulley system composition – a systematic approach (2020)
#9If the author reads this, since it's from 2020. The author appears to be currently investigating knot physics and drop tests. However, the author does not "appear" to have the Luff Tackle variation. [1] I think it's close to the 6:1 variation on row two, except with the pulley directly attached to the ceiling. The systematic approach seems to work, just appears to be missing a few combinations, or it was not really s…
The 4th item in the top row of the first image is the Luff Tackle, using the authors rule that you can invert any combination and subtract one from the advantage; the non-inverted shown in TFA is 1:4 and the luff tackle is inverted and 3:1.
Re: Pulley system composition – a systematic approach (2020)
#10I was waiting for the mathematical abstraction or software analogy; obviously, there's some composition going on.
Yes! Which entry in https://oeis.org (The On-Line Encyclopedia of Integer Sequences) is this?