I am suscribing based on this video because you make the instructions extremely clear both visually and auditorily, particularily for a novice like myself. Additionally, your video starts off and ends based on all facts, no mumble jumble blah, blah, blah or crazy background noise/music. Thank you so much for helping others, greatly appreciative of your time and knowledge. I look forward to viewing your other videos. God Bless!
The ropes are durable and just like the ones at the gym. ru-vid.comUgkxTFxba6lNeHrZaHoY_LXe6ZzmMfaipnwu Caution: I bought the 50 feet ropes and they are long and heavy so make sure you have the space (I do have the space). If I was to do it again I would probably get a shorter version as 50 feet (25 feet each side) is a little long.
Hello I work for a city in the northeast, I'm currently working to renovate a town hall clock. Was hoping I could email you with some questions on mechanical advantages. T.I.A.
If we place them horizontaly one after the other up and down or if we place them vertically one below the other do the two orders have any difference in the lifting power or the lifting power still remains the same ?
Can’t you gain a mechanical advantage simply with two pulleys by sizing one larger than the other? Without having to loop multiple passes through many pulleys?
What is needed for the strength of the rope and pully(s)? Hypothetically, if I'm lifting 1 ton with a 3:1 advantage, does the rope need to be able to handle the full ton? Or only 1/3 of a ton because of the MA? Same question for the strength of the pully(s).
Rule 1: knot at anchor is always even Rule 2: knot at load is always odd Rule 3: last pulley at the anchor is a COD Rule 4: Count # of pulleys besides any COD’s and add 1… that gives you your MA Rule 5: A simple pulling on a simple is a compound system… multiple both systems and that gives you your MA.
@Bobby T Yes!!! Thank you for this practical, helpful explanation! I spent my evening in the hay loft of my horse barn trying to figure out how to use my pulleys to lift my hay elevator up and down by myself. Sick of having to ask my neighbor for help. There's got to be a way. So I came in the house and started looking it up on RU-vid and I found this video, which is great, but come on, I'm 43 years old. I'm not trying to memorize answers for some 4th grade science quiz. I've got a farm to run here, and actual real-life problems to solve. I just need to move my dang hay elevator! Really don't care if it's even or odd or what's the proper term for each end of the rope. the only "change of direction" that matters to me is UP. As in get the HAY UP and in the BARN before it starts snowing again here in WI. Your explanation, with the cow example, is a beautiful illustration of why our education system needs to support the trades. Mechanics, welders, electricians, plumbers, heck just a guy who is handy and knows how to fix things - that is the foundation for everything else we may hope to accomplish as a human race. Theories are fun, but we have got to be able to get things done. Sorry for the long rant, I'm very tired.
Nervous about the exam??!?? How about "nervous about being able to use this to save a life" ?? What good is an A on an exam if you can't apply this when someone's life depends on it?
Anchor? Hall team? Please define your terms. I don't know what you're saying. Also, you say "rule 1: if IT'S at the anchor, it's even, if IT'S tied off at the load it's odd." What is "IT"?!?
This is me, 7 months later, I'm going to attempt to answer my own questions. Hall team is.... um, I still don't know. Anchor is basically the end section of the rope, (no more pulleys) either it's tied off (anchored) at the top or bottom, or else your own hands take the place of a tied off point, so your hands are basically the anchor. Lastly, "IT" is the rope. Did I get two out of three?
Nothing in life is free, indeed. Youre telling me... The tradeoff for mechanical advantage is NOT JUST more feet of rope you have to pull but MORE TIMES you have to adjust the pulleys once they 2-block each other. And every time you adjust the pulleys so that they dont 2-block, you need to tie off the load somehow which can require more than 1 extra piece of equipment to do so. And if the load is really far away from your setup you may need some especially long rope(s) running through the pulleys to make the magic happen in a timely manner with less resets and interruptions.
Great video. One question, suppose you have a rope that can hold 300 kilograms. Putting more weight on the rope would snap it. Does this 3 to 1 imply you can lift a weight of 1000 kilogram even if the rope would snap pulling 300 kilogram when used as a single line?
sadly, no. the weight/load, if tied off at the anchor, can EVEN be greater than the initial item being lifted, at the anchor. i've been led to believe. i'm not a rope/pulley scientist, but the mechanical advantage gained from all the pulleys you can throw at a weight, at some point have to be supported at a point ... if you have the same 300kg single line holding your 1000kg system at that point .... my guess is "snap"
No. You never want to exceed the weight limit of the rope or the anchor. You can easily apply to much mechanical advantage in a system and break rope and hardware and destroy your anchor.
Mike , if I would want to pull a 12,000 pound object you are telling me I should us a 12,000 pound rated rope ? If this is true the only advant@ge of a pulley set up is to make pulling the 12,000 pound object easier. Correct ? Thank you.
