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Old 02-10-2012, 01:49 AM   #4171
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Quote:
Originally Posted by darkproximity View Post
They have another like mine but wll of 3.5 tons for 30 bucks.. im pretty sure its a lift rating so for pulling mine would be rated at 40-50k.. thr other one would be 30-38.5k
What makes you think that? Pulling is pulling regardless of whether it's vertical or horizontal. The rating isn't going to change because you're pulling horizontally vs vertically.

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Old 02-10-2012, 01:59 AM   #4172
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There aren't any established standards for pull ratings.. however there are standards for lift ratings. Catastrophic failure when lifting is presumably more dangerous than pulling, especially if synthetic line is used when pulling. Thus the working load limit would be much lower than tensile strength for a block meant for lifting based on rating standards..

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Old 02-10-2012, 11:30 AM   #4173
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I would think that pulling vs lifting would be different since when pulling gravity is acting perpendicularly to the pull whereas lifting gravity is working directly against the pull. But that's just a guess really. I'd have to ask my dad to get a solid answer. :/
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Old 02-10-2012, 12:00 PM   #4174
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Quote:
Originally Posted by darkproximity
There aren't any established standards for pull ratings.. however there are standards for lift ratings. Catastrophic failure when lifting is presumably more dangerous than pulling, especially if synthetic line is used when pulling. Thus the working load limit would be much lower than tensile strength for a block meant for lifting based on rating standards..
Yes, failure while lifting is more dangerous but that won't change the capacity of the snatch block. I see what you are saying about the line but the line rating has no effect on the snatch block rating itself. For the sake of simplicity I will use a toy pulley that can handle 10 lbs to help explain what I'm getting at. I will leave out the ratings of all the other components except the load beacuse those have no effect on the rating of the pulley by itself. Lets say we tie the pulley to a hand rail or attach it to the edge of a table and use a piece of string to lift something that is 20 lbs, the toy pully will break. Now using the same setup except tied to a table leg and pulling horizontally with 20lbs the toy pulley will still break because it its capacity has been exceeded 100% in both cases. The capacity of the pulley doesn't change based on the direction of force so if your snatch block has a capacity of 3.5 tons(7000 lbs) for lifting the same applies to pulling.
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Old 02-10-2012, 12:05 PM   #4175
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No what i'm saying is.. in the lifting world (and we'll use your toy block as an example) since there are actual government regulated standards, they would RATE your block for a working load limit of 2 LBS, they build in a HIGH safety factor which is well below the tensile strength, which in your case was 10lbs..

Of course no matter how the load is applied to it, it wont matter but we're talking in the lifting world how they actually rate items well below what would effectively destroy the block.
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Old 02-10-2012, 12:07 PM   #4176
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Quote:
Originally Posted by Mitchness
I would think that pulling vs lifting would be different since when pulling gravity is acting perpendicularly to the pull whereas lifting gravity is working directly against the pull. But that's just a guess really. I'd have to ask my dad to get a solid answer. :/
Think about it as if you put a pull scale in line in the scenary I just mentioned. Say the 20lbs is a bucket and you start pouring sand into the bucket and lets say the pulley breaks when you reach 15 lbs of sand. The breaking point is 15 lbs. If you take the same setup on the table leg and start "pulling" with your hands till the pull scale says 15 lbs...the pulley will break. 15 lbs of force is 15 lbs if force no matter how you slice it.
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Old 02-10-2012, 12:21 PM   #4177
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Quote:
Originally Posted by darkproximity
No what i'm saying is.. in the lifting world (and we'll use your toy block as an example) since there are actual government regulated standards, they would RATE your block for a working load limit of 2 LBS, they build in a HIGH safety factor which is well below the tensile strength. Of course no matter how the load is applied to it, it wont matter but we're talking in the lifting world how they actually rate items well below what would effectively destroy the block.
Gotcha. We're now on the same page. In that case I would want to know more to make an educated decision on its pulling capacity.
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Old 02-10-2012, 12:24 PM   #4178
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Ive read its common for the saftey factor to be 4 or 5 to 1.. thus the break strength or tensile strength would be 4 to 5 times the working load limit.. so in the case of my 4.5 ton WLL

2200 x 4.5 = 9,900

9900 x 4 = 39,600
9900 x 5 = 49,500
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Old 02-10-2012, 02:43 PM   #4179
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Quote:
Originally Posted by darkproximity
Ive read its common for the saftey factor to be 4 or 5 to 1.. thus the break strength or tensile strength would be 4 to 5 times the working load limit.. so in the case of my 4.5 ton WLL

2200 x 4.5 = 9,900

9900 x 4 = 39,600
9900 x 5 = 49,500
That works for me. Nice. I wonder if the same applies to cherry pickers?
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Old 02-10-2012, 03:01 PM   #4180
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Anybody that knows 3 Rock well enough down for wheeling on Saturday? My friend Chad is jonesing for some, but everything north of Spokane is still under 6' of snow.
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Old 02-10-2012, 03:27 PM   #4181
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Ill talk to steve and see if he's down to go.. we might be able to swing something
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Old 02-10-2012, 05:07 PM   #4182
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I'll hopefully be buying a new DD come this Sunday, I'm looking at a 1986 Mitsubishi starion/conquest, it doesn't run right now but should be an easy fix lol picking it up cheap so I have some room to play in getting it running which shouldnt be to hard since it was running a week ago.
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Old 02-10-2012, 10:48 PM   #4183
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You hear back from Steve at all, Nick?
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Haha, just don't let Mitch teach you how to wheel, he is really scary
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Old 02-11-2012, 01:56 AM   #4184
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Anyone interested in a Corporate 12 bolt rear end minus a diff cover and a set of 6 tires and wheels? 4 of the tires are BFG A/Ts with at least 50% tread left. Tire size is 235/75-15 for all of them.
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Old 02-11-2012, 02:42 PM   #4185
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Anyone interested in a Corporate 12 bolt rear end minus a diff cover and a set of 6 tires and wheels? 4 of the tires are BFG A/Ts with at least 50% tread left. Tire size is 235/75-15 for all of them.
This isn't a classifieds section Chris. I thought you being a mod and all would know that. Tsk tsk
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Old 02-11-2012, 03:04 PM   #4186
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This isn't a classifieds section Chris. I thought you being a mod and all would know that. Tsk tsk
Haha!
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Old 02-11-2012, 05:50 PM   #4187
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This isn't a classifieds section Chris. I thought you being a mod and all would know that. Tsk tsk
Banned for 24hrs. Don't piss me off!!!

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Old 02-11-2012, 05:55 PM   #4188
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Lol giving it away chris?
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Old 02-11-2012, 05:57 PM   #4189
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Free stuff is stil classified :O
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Old 02-11-2012, 05:57 PM   #4190
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Lol giving it away chris?
Ya, unless someone wants to donate to my next jeep fund.
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Old 02-11-2012, 05:57 PM   #4191
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What size is that bigger then 31s?
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Old 02-11-2012, 05:58 PM   #4192
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Im sure I can get Luke out there to pick it up.. mike wants the wheels and tires
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Old 02-11-2012, 05:59 PM   #4193
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What size is that bigger then 31s?
No. Smaller.
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Old 02-11-2012, 06:00 PM   #4194
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Are they 6 lug chevy pattern wheels?
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Old 02-11-2012, 06:00 PM   #4195
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Free stuff is stil classified :O
I was joking about the ban but if you want I can make that happen.
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Old 02-11-2012, 06:01 PM   #4196
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Are they 6 lug chevy pattern wheels?
Yes.
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Old 02-11-2012, 06:01 PM   #4197
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Ya mike wants them
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Old 02-11-2012, 06:02 PM   #4198
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Don't threaten me with a good time
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Old 02-11-2012, 06:03 PM   #4199
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It's first come first serve and I'm not delivering.
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Old 02-11-2012, 06:06 PM   #4200
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I didnt expect a delivery lol.. like I said we'll get them home somehow.. Luke and I will be at the base friday working on his car and doing my waggy spring and durango steering box upgrades

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