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Posted: 12/8/2019 8:57:08 AM EDT
[#1]
Quote HistoryJackiechan.img 
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Posted: 12/8/2019 8:59:25 AM EDT
[#2]
Quote HistoryReminds me of John Prine song...
"Rooster's a'layin' chickens, chickens layin' eggs, farm machinery eatin' people's arms and legs. I ain't hurtin' nobody, ain't hurtin' no one." 
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Posted: 12/8/2019 9:00:21 AM EDT
[#3]
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No need,here it is https://manuals.directutor.com/HPE/Rigging-Handbook.fm5-125/index.html?page=1 Quote HistoryQuoted:
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Nice post. I had 5 acres of bull pine, and lodge pole logged on my property so I've got an awful lot of stumps to pull. I bought this to refresh my memory on pully's, there's not much to it that isn't in this manual. https://www.AR15.Com/media/mediaFiles/103648/IMG_0197_JPG-1187477.jpg  https://manuals.directutor.com/HPE/Rigging-Handbook.fm5-125/index.html?page=1 edt- I eyeballed that online source. That is nice, but I still something I want in book form. |
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Posted: 12/8/2019 9:34:43 AM EDT
[#4]
Quote History |
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Posted: 12/8/2019 9:49:22 AM EDT
[#5]
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As someone that grew up on sailboats I am confused why people get confused.
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Posted: 12/8/2019 9:53:40 AM EDT
[#6]
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Always loved Destin's channel and I know he is an actual rocket scientist, but the way he stood and filmed near the anchor point of the winch of the Jeep made me cringe. Ever see an anchor or winch cable fail under load? Someone posted a liveleak video of that happening here a while back. Snatch block came back through the windshield and made the poor driver's face look like the Predator. In fairnes, dude in the vid did drape the cables. |
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Posted: 12/8/2019 9:54:18 AM EDT
[#7]
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Had he consulted modern sailboat racers he would've had his mind blown. https://www.AR15.Com/media/mediaFiles/234934/20191208_062035_jpg-1187684.JPGhttps://www.AR15.Com/media/mediaFiles/234934/20191208_062035_jpg-1187685.JPGhttps://www.AR15.Com/media/mediaFiles/234934/Screenshot_20191208-062757_Chrome_jpg-1187693.JPG |
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Posted: 12/8/2019 10:03:53 AM EDT
[#8]
Any idea who or what culture invented the pulley system?
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Posted: 12/8/2019 10:10:06 AM EDT
[#9]
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Thanky, kindly. edt- I eyeballed that online source. That is nice, but I still something I want in book form. Quote HistoryQuoted:
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Nice post. I had 5 acres of bull pine, and lodge pole logged on my property so I've got an awful lot of stumps to pull. I bought this to refresh my memory on pully's, there's not much to it that isn't in this manual. https://www.AR15.Com/media/mediaFiles/103648/IMG_0197_JPG-1187477.jpg https://manuals.directutor.com/HPE/Rigging-Handbook.fm5-125/index.html?page=1 edt- I eyeballed that online source. That is nice, but I still something I want in book form.
FM 5-125 |
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Posted: 12/8/2019 10:20:14 AM EDT
[#10]
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I used to own a turbo'd E-scow. It was a spaghetti monster. Adjustable backstay, adjustable forestay, and dual adjustable running backs. There was probably four lines that if you did the wrong thing at the wrong time would drop the mast. |
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Posted: 12/8/2019 10:23:02 AM EDT
[#11]
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So to be clear, his experiment with the stuck jeep provided no mechanical advantage, correct? Simply using the snatchblock alone and moving the pull point from the tree to the bumper did not magnify force in any fashion. |
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Posted: 12/8/2019 10:24:36 AM EDT
[#12]
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A sheave is a component of a pulley, AKA pulley wheel. Pulley is an assembly. Quote HistoryQuoted:
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Spent a lot of time working with them when I designed cranes. On cranes we called them sheaves. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. |
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Posted: 12/8/2019 10:28:42 AM EDT
[#13]
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Yes. The cable is doubled on itself so the distance that the object travels is halved. The drum is still moving at the same speed as always but the cable has to cover twice the distance to move the object as it normally would in a straight pull. The key to it is that the end of the cable is connected back to the jeep. That doubles the force. If you connect it to anything else, you redirect the force but do not double it. Physics wont give you something for nothing, but it will trade with you. Quote HistoryQuoted:
Quoted: As a guy who (I thought) had used pulleys effectively as a wrecker operator, I'm feeling pretty stupid about this, but I'm going to keep talking through it until it makes sense. You're proposing that if the winch were to reel in 12" of cable, the jeep would only move toward the pulley 6"? I still can't fathom that- there's nowhere for that distance to get lost. So is the part of this that I'm missing in the fact that the pull point and the anchor point are the same? The key to it is that the end of the cable is connected back to the jeep. That doubles the force. If you connect it to anything else, you redirect the force but do not double it. Physics wont give you something for nothing, but it will trade with you. In this picture, the snatch block would be the weight, the bumper would be the anchor point on the top left, and the winch would be the pulley on the top right. The amount of line required to move the object a fixed distance is now doubled, but as a result it only requires half the force from the winch. In the picture the goal is to move the weight, but pretend the weight is a fixed point, the bumper that the anchors are attached to will move first. 
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Posted: 12/8/2019 10:29:31 AM EDT
[#14]
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Posted: 12/8/2019 10:32:57 AM EDT
[#15]
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They were never called pulleys where I worked, pulley was never a word used. We designed cranes to lift thousands of metric tons and had the Guinness book of world records lift hanging on the wall as we walked in. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. Quote HistoryQuoted:
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Spent a lot of time working with them when I designed cranes. On cranes we called them sheaves. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. |
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Posted: 12/8/2019 10:37:05 AM EDT
[#16]
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Rube Goldberg making farm equipment now? Quote HistoryQuoted:
Rube Goldberg making farm equipment now? |
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Posted: 12/8/2019 10:37:50 AM EDT
[#17]
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The sheave is just the "wheel" inside the block. (I hate the word pulley). Quote HistoryQuoted:
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Spent a lot of time working with them when I designed cranes. On cranes we called them sheaves. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. I’ve got a 30” sheave grooved for 1.25” wire rope from a 100MT crane in my garage. |
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Posted: 12/8/2019 10:43:46 AM EDT
[#18]
There are other factors at work too. . .
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Posted: 12/8/2019 10:45:37 AM EDT
[#19]
Worked in crane maintenance for awhile.
The only thing that got called a pulley was on the front of the engine. Shit most everyone called them “shivs” even if they knew better.. |
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Posted: 12/8/2019 10:47:26 AM EDT
[#20]
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There are other factors at work too. . . https://i.pinimg.com/originals/eb/b4/da/ebb4da9a2ec6e200068ff74b3004151a.jpg dyneema rope and low friction rings ftw. 
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Posted: 12/8/2019 10:48:54 AM EDT
[#21]
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who uses carbiners? dyneema rope and low friction rings ftw. https://arc-anglerfish-arc2-prod-bonnier.s3.amazonaws.com/public/AZ2272MFORIURJ3QSNLWE32O4A.jpg Quote HistoryQuoted:
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There are other factors at work too. . . https://i.pinimg.com/originals/eb/b4/da/ebb4da9a2ec6e200068ff74b3004151a.jpg dyneema rope and low friction rings ftw. https://arc-anglerfish-arc2-prod-bonnier.s3.amazonaws.com/public/AZ2272MFORIURJ3QSNLWE32O4A.jpg |
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Posted: 12/8/2019 10:56:15 AM EDT
[#22]
a big part on my job is confined space rescue and rope access.
i love rigging |
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Posted: 12/8/2019 10:57:23 AM EDT
[#23]
i carry a z rig in my snowmobile with 2 double pulleys to make it a 4 to 1 if needed.
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Posted: 12/8/2019 10:57:44 AM EDT
[#24]
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That is both horrifying and fascinating at the same time. Quote HistoryQuoted:
That is both horrifying and fascinating at the same time. I almost bought until I asked, " Do you have a service manual for it?" "Nope" "Belt guard?" "Nope" Wished I woulda done a quick finger count on him... |
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Posted: 12/8/2019 10:58:48 AM EDT
[#25]
Quote HistoryQuoted:
Rube Goldberg making farm equipment now? Quote HistoryQuoted:
Rube Goldberg making farm equipment now? |
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Posted: 12/8/2019 10:59:21 AM EDT
[#26]
Quote HistoryQuoted:
Pulleys aren't all that modern. 
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Posted: 12/8/2019 11:00:24 AM EDT
[#27]
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I need a ring like that for my Jeep recovery kit, the people who sell them are very proud of them. Quote HistoryQuoted:
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There are other factors at work too. . . https://i.pinimg.com/originals/eb/b4/da/ebb4da9a2ec6e200068ff74b3004151a.jpg dyneema rope and low friction rings ftw. https://arc-anglerfish-arc2-prod-bonnier.s3.amazonaws.com/public/AZ2272MFORIURJ3QSNLWE32O4A.jpg |
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Posted: 12/8/2019 11:06:12 AM EDT
[#28]
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A snatch block is like 20 bucks at tractor supply. Quote HistoryQuoted:
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There are other factors at work too. . . https://i.pinimg.com/originals/eb/b4/da/ebb4da9a2ec6e200068ff74b3004151a.jpg dyneema rope and low friction rings ftw. https://arc-anglerfish-arc2-prod-bonnier.s3.amazonaws.com/public/AZ2272MFORIURJ3QSNLWE32O4A.jpg |
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Posted: 12/8/2019 11:06:18 AM EDT
[#29]
Take a drink every time they say "SNATCHBLOCK"!
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Posted: 12/8/2019 11:18:51 AM EDT
[#30]
I had a long thread about this awhile back. I finally accepted that pulleys and snatch blocks work, but I still think it's black magic. And just possibly the work of the devil.
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Posted: 12/8/2019 11:20:53 AM EDT
[#31]
Quote HistoryQuoted: Never a fan of running backstays. I think the photo in the pic is a sunfast 3600. The new 3300 has a swept back rig so you can ease the running backstays completely and the mast should be okay as they are used only for bending the mast and not structural support. Or so I've read on SA before my latest permaban.
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Posted: 12/8/2019 11:20:59 AM EDT
[#32]
Quote HistoryQuoted:
They were never called pulleys where I worked, pulley was never a word used. We designed cranes to lift thousands of metric tons and had the Guinness book of world records lift hanging on the wall as we walked in. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. There were no pulleys on a drilling rig. |
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Posted: 12/8/2019 11:21:18 AM EDT
[#33]
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Yeah, those rings are smaller and I already have the soft shackles for them. Quote HistoryQuoted:
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There are other factors at work too. . . https://i.pinimg.com/originals/eb/b4/da/ebb4da9a2ec6e200068ff74b3004151a.jpg dyneema rope and low friction rings ftw. https://arc-anglerfish-arc2-prod-bonnier.s3.amazonaws.com/public/AZ2272MFORIURJ3QSNLWE32O4A.jpg I remember when the soft shackles started to become popular....people payed way too much for those too because they were new and high speed, low drag. A snatch block or two and a tree strap doesn't take up any appreciable amount of space and are both dirt cheap. |
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Posted: 12/8/2019 11:33:15 AM EDT
[#34]
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I haven't been on SA since I sold the E. I was kind of a big thing with the turbo program. |
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Posted: 12/8/2019 11:37:11 AM EDT
[#35]
Quote HistoryQuoted:
Sheaves are in the blocks on a drilling rig. There were no pulleys on a drilling rig. Quote HistoryQuoted:
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They were never called pulleys where I worked, pulley was never a word used. We designed cranes to lift thousands of metric tons and had the Guinness book of world records lift hanging on the wall as we walked in. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. There were no pulleys on a drilling rig. |
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Posted: 12/8/2019 11:40:01 AM EDT
[#36]
Anyone that been offroading knows the power of snatch blocks aka pulleys, can double or triple winch capacity
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Posted: 12/8/2019 11:40:42 AM EDT
[#37]
Realizing this helped me. It may help others. Obvious in hind site.
The only way the effort is halved is if the pulley is moving. The stationary pulley does nothing. |
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Posted: 12/8/2019 11:42:08 AM EDT
[#38]
Quote HistoryQuoted:
Realizing this helped me. It may help others. Obvious in hind site.
The only way the effort is halved is if the pulley is moving. The stationary pulley does nothing. |
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Posted: 12/8/2019 11:42:09 AM EDT
[#39]
Quote HistoryQuoted:
Realizing this helped me. It may help others. Obvious in hind site.
The only way the effort is halved is if the pulley is moving. The stationary pulley does nothing. ETA: keep in mind that the block can be attached to the thing you are hauling. It just moves with the load. Here's a 2:1 halyard setup. 
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Posted: 12/8/2019 11:42:12 AM EDT
[#40]
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You might not have called them pulleys, but that’s what they are. Quote HistoryQuoted:
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They were never called pulleys where I worked, pulley was never a word used. We designed cranes to lift thousands of metric tons and had the Guinness book of world records lift hanging on the wall as we walked in. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. There were no pulleys on a drilling rig. |
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Posted: 12/8/2019 11:44:00 AM EDT
[#41]
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You said you need one though, you don't need one, you just want one because they are the latest and greatest way to recover. I remember when the soft shackles started to become popular....people payed way too much for those too because they were new and high speed, low drag. A snatch block or two and a tree strap doesn't take up any appreciable amount of space and are both dirt cheap. Quote HistoryQuoted:
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There are other factors at work too. . . https://i.pinimg.com/originals/eb/b4/da/ebb4da9a2ec6e200068ff74b3004151a.jpg dyneema rope and low friction rings ftw. https://arc-anglerfish-arc2-prod-bonnier.s3.amazonaws.com/public/AZ2272MFORIURJ3QSNLWE32O4A.jpg I remember when the soft shackles started to become popular....people payed way too much for those too because they were new and high speed, low drag. A snatch block or two and a tree strap doesn't take up any appreciable amount of space and are both dirt cheap. |
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Posted: 12/8/2019 11:47:03 AM EDT
[#42]
I’ve got a static’s/dynamics final over pulleys Tuesday...
I guess I can count watching that video as studying.
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Posted: 12/8/2019 11:56:25 AM EDT
[#43]
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Put a lot of cranes an drilling rigs, none of the drawings said pulley. Lots said sheave. Quote HistoryQuoted:
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They were never called pulleys where I worked, pulley was never a word used. We designed cranes to lift thousands of metric tons and had the Guinness book of world records lift hanging on the wall as we walked in. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. There were no pulleys on a drilling rig. Definition of pulley 1: a sheave or small wheel with a grooved rim and with or without the block in which it runs used singly with a rope or chain to change the direction and point of application of a pulling force and in various combinations to increase the applied force especially for lifting weights 2: a pulley or pulleys with ropes to form a tackle that constitutes one of the simple machines 3: a wheel used to transmit power by means of a band, belt, cord, rope, or chain passing over its rim Definition of sheave (Entry 1 of 2): a grooved wheel or pulley (as of a pulley block) |
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Posted: 12/8/2019 11:57:58 AM EDT
[#44]
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Good grief they are the same thing. From the dictionary. Definition of pulley 1: a sheave or small wheel with a grooved rim and with or without the block in which it runs used singly with a rope or chain to change the direction and point of application of a pulling force and in various combinations to increase the applied force especially for lifting weights 2: a pulley or pulleys with ropes to form a tackle that constitutes one of the simple machines 3: a wheel used to transmit power by means of a band, belt, cord, rope, or chain passing over its rim Definition of sheave (Entry 1 of 2): a grooved wheel or pulley (as of a pulley block) Quote HistoryQuoted:
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They were never called pulleys where I worked, pulley was never a word used. We designed cranes to lift thousands of metric tons and had the Guinness book of world records lift hanging on the wall as we walked in. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. There were no pulleys on a drilling rig. Definition of pulley 1: a sheave or small wheel with a grooved rim and with or without the block in which it runs used singly with a rope or chain to change the direction and point of application of a pulling force and in various combinations to increase the applied force especially for lifting weights 2: a pulley or pulleys with ropes to form a tackle that constitutes one of the simple machines 3: a wheel used to transmit power by means of a band, belt, cord, rope, or chain passing over its rim Definition of sheave (Entry 1 of 2): a grooved wheel or pulley (as of a pulley block) https://www.thecrosbygroup.com/catalog/mckissick-sheaves/ |
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Posted: 12/8/2019 12:08:18 PM EDT
[#45]
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Every once in a while I create a new sock name, post some pro trump memes, get banned, and repeat. Occasionally, I get involved in a sailing topic. Quote HistoryQuoted:
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I haven't been on SA since I sold the E. I was kind of a big thing with the turbo program. |
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Posted: 12/8/2019 12:11:28 PM EDT
[#46]
Snatch block
I just love saying that ETA: Recovery in reverse direction with a front mounted winch. I keep three snatch blocks, three tree savers, and multiple shackles in the recovery kit for this very need. There, I said snatch block again.  Attached File |
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Posted: 12/8/2019 12:21:36 PM EDT
[#47]
Quote HistoryQuoted:
They were never called pulleys where I worked, pulley was never a word used. We designed cranes to lift thousands of metric tons and had the Guinness book of world records lift hanging on the wall as we walked in. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. |
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Posted: 12/8/2019 12:32:52 PM EDT
[#48]
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Again, sheaves are pulley wheels. A pulley is a sheave with an axle.. a system or assembly. Trying to argue from authority because a company you worked for had a record means nothing. It isn't going to change the definition of pulley or sheave. They were likely calling a sheave a sheave, referring to the individual wheels in the block and pulley assemblies. A crane has lots of sheaves. It also has lots of axles going though those sheaves, it therfor has pulleys (or blocks, depending on the usage/enclosure), whether you call them pulleys or not. Quote HistoryQuoted:
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They were never called pulleys where I worked, pulley was never a word used. We designed cranes to lift thousands of metric tons and had the Guinness book of world records lift hanging on the wall as we walked in. One set of cranes had 24 miles of wire rope on them, they had a lot of sheaves. |
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Posted: 12/8/2019 12:35:34 PM EDT
[#49]
the reply on the principal of magnets to accomplish work. no one knows how they actually function.
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Posted: 12/8/2019 12:52:11 PM EDT
[#50]
Quote HistoryQuoted:
a big part on my job is confined space rescue and rope access. i love rigging 
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