amsteel blue spider legs
- Thread starter double_d
- Start date
Norm_Hall
New member
- Location
- Wauconda, (Chicago),IL,USA
We use 1/2" and 5/8" Amsteel with a 15" spliced eye. Lengths are 20' and 30'.
Amsteel Blue has a 34,000 lb. ABS in 1/2", 40,500 in 9/16" and 52,800 in 5/8".
I would think 1/2" is plenty strong at 34,000. That's a SWL (static lift) of 6,800 lbs.
The hitches we tie are cow and the 'better' timber.
Amsteel Blue has a 34,000 lb. ABS in 1/2", 40,500 in 9/16" and 52,800 in 5/8".
I would think 1/2" is plenty strong at 34,000. That's a SWL (static lift) of 6,800 lbs.
The hitches we tie are cow and the 'better' timber.
NickfromWI
Participating member
- Location
- Los Angeles, CA
Alright...I'll ask...Norm, what's the better timber?
Norm_Hall
New member
- Location
- Wauconda, (Chicago),IL,USA
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Alright...I'll ask...Norm, what's the better timber?
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It's a timber hitch with 2 turns at the throat instead of 1. We find that it holds better. I posted a pic of it in an earlier thread. Here it is again on a coastal redwood. NOTE the 2 turns on the throat.
Alright...I'll ask...Norm, what's the better timber?
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It's a timber hitch with 2 turns at the throat instead of 1. We find that it holds better. I posted a pic of it in an earlier thread. Here it is again on a coastal redwood. NOTE the 2 turns on the throat.
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NickfromWI
Participating member
- Location
- Los Angeles, CA
Very cool! I'll give it a shot next time.
Seems you could take it a step further by replacing the full turn with a clove hitch or a girth/cow hitch there...but that'd be just silly!
love
nick
Seems you could take it a step further by replacing the full turn with a clove hitch or a girth/cow hitch there...but that'd be just silly!
love
nick
- Location
- NJ
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It's a timber hitch with 2 turns at the throat instead of 1
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Do you notice anymore or less glazing of rope from shocks??
Is there more strenght loss dew to 2 wraps???
It's a timber hitch with 2 turns at the throat instead of 1
[/ QUOTE ]
Do you notice anymore or less glazing of rope from shocks??
Is there more strenght loss dew to 2 wraps???
Norm_Hall
New member
- Location
- Wauconda, (Chicago),IL,USA
[ QUOTE ]
Very cool! I'll give it a shot next time.
Seems you could take it a step further by replacing the full turn with a clove hitch or a girth/cow hitch there.
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Nick, believe it or knot, we have tried it with a clove. The clove hitch gets cinched and becomes very hard to untie.
We have had excellent luck tying it as in the attachment. There doesn't seem to be as much force trying to unthread the 'tucks'.
Very cool! I'll give it a shot next time.
Seems you could take it a step further by replacing the full turn with a clove hitch or a girth/cow hitch there.
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Nick, believe it or knot, we have tried it with a clove. The clove hitch gets cinched and becomes very hard to untie.
We have had excellent luck tying it as in the attachment. There doesn't seem to be as much force trying to unthread the 'tucks'.
Norm_Hall
New member
- Location
- Wauconda, (Chicago),IL,USA
[quoteDo you notice anymore or less glazing of rope from shocks??
Is there more strenght loss dew to 2 wraps???
[/ QUOTE ]
If you are experiencing glazing, the system is being drastically overloaded. None of our spider leg slings have glazing on them.
Here again, we don't load our slings anywhere near capacity. At most, 20% of the ABS. But, I would think due to the 2 turns on the bight, there would be a slight decrease in rope strength? My opinion only.
Is there more strenght loss dew to 2 wraps???
[/ QUOTE ]
If you are experiencing glazing, the system is being drastically overloaded. None of our spider leg slings have glazing on them.
Here again, we don't load our slings anywhere near capacity. At most, 20% of the ABS. But, I would think due to the 2 turns on the bight, there would be a slight decrease in rope strength? My opinion only.
thanks norm the better timber looks pretty cool ill have to try that one out. ive never used a knuckle boom before and it seems like there is a lot u can do with one. on removals i would like to try taking bigger sections of the tree off with the KB and spider leg setup. does anyone have any other advice/info for just starting off using this system?
Ive always been told three tight legs on anything you don't want to move around once the lift on decent has started. three properly spaced legs in any rigging situation is stronger than four because all the legs will be weighted the same on four or more legs the total load can be placed on two of the legs. if i knew how to upload pics and images i could scan some pics out of my rigging manual.
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Ive always been told three tight legs on anything you don't want to move around once the lift on decent has started. three properly spaced legs in any rigging situation is stronger than four because all the legs will be weighted the same on four or more legs the total load can be placed on two of the legs. if i knew how to upload pics and images i could scan some pics out of my rigging manual.
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what???hmmm, no.
Ive always been told three tight legs on anything you don't want to move around once the lift on decent has started. three properly spaced legs in any rigging situation is stronger than four because all the legs will be weighted the same on four or more legs the total load can be placed on two of the legs. if i knew how to upload pics and images i could scan some pics out of my rigging manual.
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what???hmmm, no.
- Location
- NJ
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guys lifting this locomotive
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Is that Thomas?
guys lifting this locomotive
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Is that Thomas?
notice the spreader bars that make the pick a two sling pick, two triangles. you are on the offensive. i am a cert. rigger meaning that i am cert to rig lifts in excess of 500 tons without any one looking over my shoulder. i can back up everything i'm telling you, but i refuse to highjack this thread. 3 is not mathematically stronger than four, but in our imperfect world the rigging manufactures will tell you that a four leg bridle as you used on to your pick is not rated to pick as much as a three leg bridle, due to the fact you can accidentally weight just two of the sling legs. in a three leg bridle this is not possible. i've went to 12 different rigging schools they all say the same thing(every time you work in a nuke doing heavy lift rigging you have to go to one of their schools. they usually last about a week). i refuse to argue, if i want to do that i'll talk to my old lady. take what i said or leave it. i still don't care. just my $.04
Norm_Hall
New member
- Location
- Wauconda, (Chicago),IL,USA
[ QUOTE ]
Ive always been told three tight legs on anything you don't want to move around once the lift on decent has started. three properly spaced legs in any rigging situation is stronger than four because all the legs will be weighted the same on four or more legs the total load can be placed on two of the legs. if i knew how to upload pics and images i could scan some pics out of my rigging manual.
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I would be very interested in seeing some pics. I wanna learn all I can.
Ive always been told three tight legs on anything you don't want to move around once the lift on decent has started. three properly spaced legs in any rigging situation is stronger than four because all the legs will be weighted the same on four or more legs the total load can be placed on two of the legs. if i knew how to upload pics and images i could scan some pics out of my rigging manual.
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I would be very interested in seeing some pics. I wanna learn all I can.
