How does a Compound Pulley Systems work

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  • čas přidán 4. 07. 2024
  • How to make a compound pulley system can be very simple.. Just put a simple on a simple.. See what I did there 😉. In this video we get into the three most used compound pulley systems. Of course there are countless variations possible. I will also demonstrate why using a compound pulley system may not be what you need.
    The answers to last weeks quiz can be found on this post on www.theropeaccesschannel.com:
    www.theropeaccesschannel.com/...
    Check out the first comment.
    Video’s mentioned:
    THIS is how simple pullesystems work
    • This is how simple pul...
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    Chapters
    0:00 Intro
    0:18 Recap Simple Pulley System
    0:32 Drawing out a Compound Pulley System
    2:30 Compound Pulley System
    5:40 Switching the compound pulley system around
    9:00 The DISADVANTAGES of a compound pulley system
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  • Jak na to + styl

Komentáře • 57

  • @TheRopeAccessChannel

    What are your answers to the quiz?
    And why would you use the last system??

    • @benediktmayr3465
      @benediktmayr3465 Před rokem

      Maybe I would want to use the last system if I have to lift something very carefully/slowly.
      This System would allow me to lift the load with only half the speed im pulling the rope.

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      @@benediktmayr3465 Almost, sort of, not really though 😉
      I will explain next week. Ok, just a hint Did you watch the video I pointed you to in the end? Does it look like we are trying to move someone slow?

    • @benediktmayr3465
      @benediktmayr3465 Před rokem +1

      @@TheRopeAccessChannel Oh yeah right I didnt watch the video yet no but I just realised that i had the right thought but wrong assumption...
      It would be to move something fast!
      A normal setup already pulls things slowly and this one is the opposite.

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      @@benediktmayr3465 👊🏻👊🏻😃 Correctemundo! Get something moving twice as fast! (for twice the input though)

  • @benediktmayr3465
    @benediktmayr3465 Před rokem +6

    Here we go again!
    A) 15:1 (5*3:1)
    B) 3:1
    It seems to be a 6 to one at first since you have 2*3:1 but if i see it correctly they dont add up but are just parallel to each other
    C) 0,5:1
    The weight basically acts as its own pulley onto our system
    it becomes apparent after looking at it upside down.

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      correct. I would call the last on a 1:2 but we mean the same thing.
      If you want the answers, check out the top comment on this post:
      bit.ly/3hM2Hai

  • @matiasgarcia886
    @matiasgarcia886 Před rokem +1

    Hi, great and very well explained video
    I'd love to see this kind of format but instead explaining the GRIMP day techniques and manouvers.
    It would greatly help the rope rescue operators (and enthusiasts) of your channel.
    Thank you!

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem +1

      Thank you 😀.
      I am getting to that. First we need to get some basic things out of the way.
      1) Being able to move around on rope
      2) Understand the gear involved
      3) Understand the principles of rigging and the sometimes hidden dangers
      4) What happens when we add pulleys and mechanical advantages
      5) How to tension ropes.
      And some more things.
      It will take some time and by the time I am done I will have shown everything needed for a Grimpday team. I will get some outside help to accomplish that :-)

  • @EricNietofilms
    @EricNietofilms Před rokem

    A = 15:1
    B = looks like a 3:1 (if 1 person it's pulling from both systems)
    C = 1:2 used for making the speed double.
    Nice videos, and I like you making us breaking our heads on this quiz!

  • @shiotime.77
    @shiotime.77 Před rokem +1

    Drawing A is a simple 3:1 MA (last pulley on the right is just a CD) acting on a simple 4:1 MA with separate system therefore 3x4 = 12:1 COMPOUND MA...Drawing B both systems are in simple 3:1 MA configuration, when you pull both ends the MA does NOT change at all...Drawing C is basically a 2:1 MA because the upper pulley is a simple 1:1 configuration that is mostly used to DEVIATE directional anchor system...
    I think it is also a BIG help if you could explain further the differences of SIMPLE, COMPOUND, and COMPLEX Mechanical Advantages...For sure, a lot of people in our rope community is still in CONFUSION state...Thanx Alex!...Way to go!..;)

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem +1

      Thanks for participating!
      Answer B is correct, the other two however are not. Count the ropes again in question A.
      Question C: is a bit more complicated though. Have a good look and try to envision how fast the load moves in comparison to the pull. If it would be a 2:1 the load will move at half the speed. Is that really happening?
      If you want the answers, check out the top comment on this post:
      bit.ly/3hM2Hai
      I can explain further on Simple Compound and Complex but in each video so far I have mentioned when a system is what. Also in the upcoming Complex video.
      Maybe I should make a shorter one recapping everything and tying it together. That might be a good idea.
      Thank you

  • @technoheld1989
    @technoheld1989 Před rokem +1

    A 15 : 1--- B 6 :1 --- C 1 : 1 Hello and thank you for these interesting videos. I really thought long and hard about System C. Likely loss of Mechanical Advantage. Only 0,5 : 1. I'm looking forward to the result.

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      Almost. A is right, B wrong, and C nice correction! It is a Mechanical DISadvantage ;-)
      If you want the answers, check out the top comment on this post:
      bit.ly/3hM2Hai

  • @MrAchile13
    @MrAchile13 Před 4 dny

    A 15:1
    B 3:1 (as I understand it having 2 3:1 or a single 3:1 is the same thing as long as you're gonna pull both 3:1 by yourself)
    C 0.5? since the load is 100 kg and it's anchored to the ground, your input would need to be 200 kg

  • @balhatchet
    @balhatchet Před rokem +1

    A: 15:1
    B: 3:1
    C: 0.5:1 - sometimes called a reverse 2:1 (you could use this if you wanted to raise your load twice as fast as you're pulling, stunts would be a good situation for it)

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      Exactly! spot on! Thats why I pointed to the stuntvideo in the end 😉😉😉

  • @340wbymag
    @340wbymag Před rokem +1

    I am in love with pulley systems. For some stupid reason I cannot explain, they just fascinate me. I have for fun and my own personal education constructed ratios up to 550;1. That would be a 15:1 pulling on another 15:1 being pulled by a 2:1 system. That's when I ran out of pulleys. Imagine all the climbing gear you could break with a system like that, but if it held together, you could lift a mountain.
    As to why you might use a complicated system, the answer is easy. It's easier to use the right pulley system to move a heavy load. I am a small old man, but with my pulleys and ropes I can move and lift game when I hunt. Imagine a puny little guy like me dragging an elk up a mountainside to my truck after a successful hunt. Imagine me attempting to perform a rescue and having to raise or lower a victim without pulleys. Pulleys are worth their weight in gold.
    I will only answer the last question in your quiz so others can respond. C is a tricky question because it looks like a 2:1 system, but is instead a .5:1 ratio, meaning you'd have to lift with twice as much force (200) to lift the load. That's a good question!

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem +1

      🤯550:1!! I though I was weird making an 81:1 to test things. We actually ripped the sheath of the rope then..... 😂😂😂. According to legends, pulleys and levers are what build the pyramids😉. Ingenious systems!
      Question C) is correct. You would need twice the force. What happens with the speed?

    • @340wbymag
      @340wbymag Před rokem

      @@TheRopeAccessChannel You double the speed of the pull.

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem +1

      @@340wbymag exactly so if you would want someone to move fast and far that would be the way. You just need more input😜

    • @340wbymag
      @340wbymag Před rokem

      @@TheRopeAccessChannel Correct me if I am wrong, but I believe this configuration (C) would increase to load upon the uppermost pulley to 400 pounds (or kilos).

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      @@340wbymag that is correct 👍🏼

  • @ralphm5273
    @ralphm5273 Před rokem

    A: 15:1
    B: 3:1
    C: 1:2
    Would have been great if my physics teacher back in the days would explain it as interesting as you do. keep it up. 👏🏼

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem +1

      Thanks for that!
      Correct answers by the way. Can you think of something where you would use C?

    • @ralphm5273
      @ralphm5273 Před rokem

      @@TheRopeAccessChannel this would be used for cases where lifting speed is more important than lifting weight.

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem +1

      @@ralphm5273 exactly. Like we did in the stuntrigging video a few weeks ago. Move someone fast and far👍🏼

  • @brodobrey9009
    @brodobrey9009 Před rokem +1

    A) 15:1 b) 8:1 c) 1:1 or 1:1,5 no have anvantage, c-it's interesting gueestion)

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      Hi Bob,
      A) Correct
      B) Incorrect. I am curious how you got to 8:1
      C) Almost got it 🙂.
      If you want the answers, check out the top comment on this post:
      bit.ly/3hM2Hai

  • @nathanhead6140
    @nathanhead6140 Před rokem

    A) 15:1 (5:1 x 3:1 w CD)
    B) 3:1
    C)1:2 - Because the tension in a rope going through a pulley is equal on both sides, so that means that the pulley that is connected to the load is actually seeing 2 times the weight of the load. The second pulley is only a 1:1, so that results in a very inefficient 1:2 overall

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      Well, inefficient depends on why you set that up 😉😉😉. What happens with the load if I pull with 1 m/s?

  • @richskater
    @richskater Před rokem

    A. 15:1 (3:1->5:1)
    B. 3:1 (w/ a backup😆)
    C. 1:2 (hoping for more of these, they are the hardest to figure out (when biggger) and there's not much on here about these types of systems)

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      Correct. Complex systems can be tough to figure out. Most of those quizzes and puzzles I see online are more theoretical setups that no one would ever use. Just a fun thing to test your understanding on the T-Method. Let me say that no one in normal rope access. There might some niche spot where some exotic complex 7:1 might make sense and where the advantage outweighs all the disadvantages. Something like. mountainguide crevasse rescue setup.
      I use C) when we do stuntrigging and want to move something fast over a relatively short distance. Input could be something mechanical like a winch or a ram. Or just two guys holding on and jumping from a ladder haha

  • @EricTheDane
    @EricTheDane Před 2 měsíci

    Green box is also a 3:1 (same as red box). Both are 9:1.

  • @caotropheus
    @caotropheus Před rokem

    A 15:1
    B 3:1 (eventhough there are two 3:1 systems, 3 metre pull only moves the load 1 metre)
    C 1:2

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      Correct. good call on B!
      If you want the answers, check out the top comment on this post:
      bit.ly/3hM2Hai

  • @gallant_hung
    @gallant_hung Před rokem

    1. 15:1 compound
    2. 3:1 CD & 3:1 CD TTRS
    3. 1:1 pulley for change direction of the 1:1 CD, use for low angle change to high angle, I guess😂

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      Does system 2 make it feel lighter?
      With 3, if you pull down 1 meter, how far does the load move?

  • @FalenAnjel2
    @FalenAnjel2 Před rokem

    A- (Blue rope is 3) (3 carries to black 5 time (3 on bothsides of the pully x2+ 6) so 6,6,1 =13 + the blue16:1
    B- 6:2 ( 3:1 1 system 3:1 2nd system + 6:2)
    C- 1:1 ( I haven't seen or set a system like this up myself so I don't know). Since the "general rule" taught to me is when we're towards the load and not the anchor it counts to M:A anything towards the anchors (minus complex systems) won't contribute to your M:A and it's a deadline.
    If I am wrong is any of this please correct me with a work layout so I can figure out were I miscounted and learn from it.

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem +1

      Thank you for your comment.
      A) You are complicating it so much i dont even understand how you got to 16:1. If you watch the video again it should be clear. I don't understand how my explanation in the video could lead you to that. Help me learn here. First identify how many simple systems are working here, then identify which is pulling on which. Then it should be clear.
      B) I get what you are saying and the input can not be 2 if I say, "me as a single person pulls on the load". Then the input is always 1. Think about if the load will move at 6 times the speed or 3 times the speed (slower that is). That will tell you the MA. Or is the load going to move slower when we add the second system?
      C)That general rule is correct for simple systems and even compound ones. Actually also here..
      If I have a load and one pulley at the anchor and pull down that would be a basic 1:1 with CD. But in this example I am not pulling on the load, I am pulling on a pulley. And another general rule is, if a pulley moves, it does something for the MA. Therefore it can not be a 1:1.

  • @KowalscyTeam
    @KowalscyTeam Před rokem

  • @rogernation2551
    @rogernation2551 Před rokem +1

    If you have a 9-1 system ( two 3-1 systems), and add the same system. Would that be 81-1? It’s two 9-1 systems, so 9x9=81.
    I would use pulleys rather than prusiks. I’m pulling tree stumps and I want to overkill it…… by a lot.

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      3x3x3=27:1

    • @rogernation2551
      @rogernation2551 Před rokem

      A complex 9:1 (3x3) stand alone system, but instead of connecting that to force, connect that to another 9:1 stand alone system. Then connect that to force. So that would be two separate 9:1 systems connected to my winch. Is that 9x9? Which would equal to 81.
      And I want to edit the statement about prusiks, I meant to say, “ I would use pulleys rather than carabiners with the prusiks

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      @@rogernation2551 now that makes more sense. Pulleys over biners any day!
      If you put a 9:1 to a 9:1 that would be 9x9 indeed

    • @rogernation2551
      @rogernation2551 Před rokem

      Thank you for your confirmation. Kinda thought so, but I’ve only been doing this for a couple of years and still consider myself a novice.
      Which is cool, so much to learn

  • @serhiikushnir4945
    @serhiikushnir4945 Před rokem +1

    a) 15:1
    b) 3:1
    c) 1:1

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      Almost got it my friend. Answer a & b are right. C is different though. Answer will be on the website.

  • @martindan5680
    @martindan5680 Před rokem

    A - 15:1
    B - 3:1
    C - 2:1

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      Close one Martin. check out C) again. If I pull down, will the load be twice as light like with the other pulley systems?

  • @infbajuk
    @infbajuk Před rokem +1

    A 15:1 B: 3:1 C 1:2

  • @jackkuo1139
    @jackkuo1139 Před rokem

    A: 4:1; B: 3:1; C: 2:1

    • @TheRopeAccessChannel
      @TheRopeAccessChannel  Před rokem

      You are on the right track.
      Check out A) again. it is not a 12:1
      B) Trick question and you saw through it👍🏻
      C) Incorrect. If you pull on the blue rope, does the load get lighter?
      I don't know what more to say on SIMPLE than what I said in the previous video? I also say that in the beginning here and at 9:00 I show the definition of COMPOUND. COMPLEX will come next week.
      I am creating this under the assumption that everyone who is interested watches all the video's on the subject. So maybe I will go and make a sort of recap video after the COMPLEX one to put them all in one place.
      Yes, I will do that. Thank you!