Self leveling rig
- Thread starter Norm_Hall
- Start date
classictruckman
Participating member
- Location
- Ottawa Valley, Ontario, Canada
[ QUOTE ]
We have done that type of choke for years, we call it a barrell hitch. We use 2 chokers that are the same length and 2 shackles. You feed the free eye of sling #1 though the 2nd chokers shackle and feed it over the top of the butt and then feed the 2nd eye thought the 1st slings shackle and then over the top of the butt. Tighten up it up and hook the 2 eyes of the slings to the hook and ball up.... Great technique for taking down big butts, it eliminates the shock load to the boom when the butt starts to fall... Works really well in tight spaces and when the butt is up against a structure or fence etc etc... Linus
[/ QUOTE ]
What is the point of this "self leveling rig"? I use 2 slings on logs all the time, sometimes notched in, depends on the situation and is see no need for something that self levels, the CofG will come under the hook after the pick nomater how you rig it.
Linus what do you mean by shockloading when the butt starts to fall?, are you talking about a controlled fall using the crane to lower the butt as it falls? And how would this eliminate the shockloading over having 2 slings opposite to each other and each attached to the hook?
We have done that type of choke for years, we call it a barrell hitch. We use 2 chokers that are the same length and 2 shackles. You feed the free eye of sling #1 though the 2nd chokers shackle and feed it over the top of the butt and then feed the 2nd eye thought the 1st slings shackle and then over the top of the butt. Tighten up it up and hook the 2 eyes of the slings to the hook and ball up.... Great technique for taking down big butts, it eliminates the shock load to the boom when the butt starts to fall... Works really well in tight spaces and when the butt is up against a structure or fence etc etc... Linus
[/ QUOTE ]
What is the point of this "self leveling rig"? I use 2 slings on logs all the time, sometimes notched in, depends on the situation and is see no need for something that self levels, the CofG will come under the hook after the pick nomater how you rig it.
Linus what do you mean by shockloading when the butt starts to fall?, are you talking about a controlled fall using the crane to lower the butt as it falls? And how would this eliminate the shockloading over having 2 slings opposite to each other and each attached to the hook?
- Location
- Phila. Pa.
[ QUOTE ]
We have done that type of choke for years, we call it a barrell hitch. We use 2 chokers that are the same length and 2 shackles. You feed the free eye of sling #1 though the 2nd chokers shackle and feed it over the top of the butt and then feed the 2nd eye thought the 1st slings shackle and then over the top of the butt. Tighten up it up and hook the 2 eyes of the slings to the hook and ball up.... Great technique for taking down big butts, it eliminates the shock load to the boom when the butt starts to fall... Works really well in tight spaces and when the butt is up against a structure or fence etc etc... Linus
[/ QUOTE ]
He is using one choker and one shackle not 2 chokers and 2 shackles. If you are using two chokers why not just have them cinch on opposite sides of the log with each choker going through it's own eye?
We have done that type of choke for years, we call it a barrell hitch. We use 2 chokers that are the same length and 2 shackles. You feed the free eye of sling #1 though the 2nd chokers shackle and feed it over the top of the butt and then feed the 2nd eye thought the 1st slings shackle and then over the top of the butt. Tighten up it up and hook the 2 eyes of the slings to the hook and ball up.... Great technique for taking down big butts, it eliminates the shock load to the boom when the butt starts to fall... Works really well in tight spaces and when the butt is up against a structure or fence etc etc... Linus
[/ QUOTE ]
He is using one choker and one shackle not 2 chokers and 2 shackles. If you are using two chokers why not just have them cinch on opposite sides of the log with each choker going through it's own eye?
allmark
Participating member
[ QUOTE ]
What is the point of this "self leveling rig"? I use 2 slings on logs all the time, sometimes notched in, depends on the situation and is see no need for something that self levels, the CofG will come under the hook after the pick nomater how you rig it.
Linus what do you mean by shockloading when the butt starts to fall?, are you talking about a controlled fall using the crane to lower the butt as it falls? And how would this eliminate the shockloading over having 2 slings opposite to each other and each attached to the hook?
[/ QUOTE ]
When you hook up 2 slings often one sling will end up longer than the other. This will cause the log to tip in one direction or the other. The point of this is to pick the log staigt up rather than haveing it tip. That style of setting the slings allows exactly that.
The shock loading would occur while setting the above rigged piece down. as the but of the log touches the ground and the crane operator lowers the top toward horizontal the slings can slip and load the crane, This can be avoided if the log is set on the side 90* from where the slings choke the log.
What is the point of this "self leveling rig"? I use 2 slings on logs all the time, sometimes notched in, depends on the situation and is see no need for something that self levels, the CofG will come under the hook after the pick nomater how you rig it.
Linus what do you mean by shockloading when the butt starts to fall?, are you talking about a controlled fall using the crane to lower the butt as it falls? And how would this eliminate the shockloading over having 2 slings opposite to each other and each attached to the hook?
[/ QUOTE ]
When you hook up 2 slings often one sling will end up longer than the other. This will cause the log to tip in one direction or the other. The point of this is to pick the log staigt up rather than haveing it tip. That style of setting the slings allows exactly that.
The shock loading would occur while setting the above rigged piece down. as the but of the log touches the ground and the crane operator lowers the top toward horizontal the slings can slip and load the crane, This can be avoided if the log is set on the side 90* from where the slings choke the log.
- Location
- Phila. Pa.
[ QUOTE ]
When you hook up 2 slings often one sling will end up longer than the other. This will cause the log to tip in one direction or the other. The point of this is to pick the log staigt up rather than haveing it tip. That style of setting the slings allows exactly that.
The shock loading would occur while setting the above rigged piece down. as the but of the log touches the ground and the crane operator lowers the top toward horizontal the slings can slip and load the crane, This can be avoided if the log is set on the side 90* from where the slings choke the log.
[/ QUOTE ]
When you have two equal lenght chokers wrapped around a log at essentially the same point, just cinched on opposite sides, how does one end up that much longer that it causes the log to hang out of vertical enough that it matters?
When you hook up 2 slings often one sling will end up longer than the other. This will cause the log to tip in one direction or the other. The point of this is to pick the log staigt up rather than haveing it tip. That style of setting the slings allows exactly that.
The shock loading would occur while setting the above rigged piece down. as the but of the log touches the ground and the crane operator lowers the top toward horizontal the slings can slip and load the crane, This can be avoided if the log is set on the side 90* from where the slings choke the log.
[/ QUOTE ]
When you have two equal lenght chokers wrapped around a log at essentially the same point, just cinched on opposite sides, how does one end up that much longer that it causes the log to hang out of vertical enough that it matters?
- Location
- Centralia, Illinois
So Norm if I use some 18,500 rated pro force/ by allgear, Will this configuration double the breaking strength to 37,000
Norm_Hall
New member
- Location
- Wauconda, (Chicago),IL,USA
No, It's still in single line form.
- Location
- urbana, il.
Yeah Norm, I still say that is a creative and unique rig. You have been using that for years now, have you had any issues?
Norm_Hall
New member
- Location
- Wauconda, (Chicago),IL,USA
[ QUOTE ]
Yeah Norm, I still say that is a creative and unique rig. You have been using that for years now, have you had any issues?
[/ QUOTE ]
I think right around 15 years is pretty accurate.
Yeah Norm, I still say that is a creative and unique rig. You have been using that for years now, have you had any issues?
[/ QUOTE ]
I think right around 15 years is pretty accurate.
allmark
Participating member
I used it today and it worked great. I was taking real short pieces of a pine next to wires while reaching over a house. About a 90' radius from the crane. The pieces came straight up with out any movement.
- Location
- Hawaii
Is there a significant loss to the strength of the sling from being choked twice in that configuration? Cool setup btw.
jp
jp
Norm_Hall
New member
- Location
- Wauconda, (Chicago),IL,USA
[ QUOTE ]
Is there a significant loss to the strength of the sling from being choked twice in that configuration? Cool setup btw.
[/ QUOTE ]
I wouldn't think there is significant strength loss. The rope angle at the 'choke' is around 90* and the screw pin shackle is < 120*. It's pretty much a lift using a 'choked' eye & eye sling just anchored back to itself 180* apart, so the body of the sling goes onto the hook. This is 1 application where staying at 10-15% of the ABS is highly recommended. That's why the sling I use for this application is 5/8" Amsteel, 40,700 lbs. ABS.
Is there a significant loss to the strength of the sling from being choked twice in that configuration? Cool setup btw.
[/ QUOTE ]
I wouldn't think there is significant strength loss. The rope angle at the 'choke' is around 90* and the screw pin shackle is < 120*. It's pretty much a lift using a 'choked' eye & eye sling just anchored back to itself 180* apart, so the body of the sling goes onto the hook. This is 1 application where staying at 10-15% of the ABS is highly recommended. That's why the sling I use for this application is 5/8" Amsteel, 40,700 lbs. ABS.
I can't understand one thing. By using one strap, isn't most of the straps grip being applied 180 degrees from the side you're picking from? So why would you ever consider pulling up on that? Why not use 2 straps and attach a leveling link between them?
Tr33Climb3r
Participating member
- Location
- Wisconsin
So that is an eye to eye sling right?
allmark
Participating member
[ QUOTE ]
I can't understand one thing. By using one strap, isn't most of the straps grip being applied 180 degrees from the side you're picking from? So why would you ever consider pulling up on that? Why not use 2 straps and attach a leveling link between them?
[/ QUOTE ]
This is the way I usually do it
I can't understand one thing. By using one strap, isn't most of the straps grip being applied 180 degrees from the side you're picking from? So why would you ever consider pulling up on that? Why not use 2 straps and attach a leveling link between them?
[/ QUOTE ]
This is the way I usually do it
Attachments
allmark
Participating member
allmark
Participating member
Norm_Hall
New member
- Location
- Wauconda, (Chicago),IL,USA
[ QUOTE ]
I can't understand one thing. By using one strap, isn't most of the straps grip being applied 180 degrees from the side you're picking from? So why would you ever consider pulling up on that? Why not use 2 straps and attach a leveling link between them?
[/ QUOTE ]
Like I said in an earlier post, I cut notches for the sling to fit into, 90* from the choke.
Using 2 slings in a 'choking' fashion 180* apart and adding another to act as the balancer is a great method.
The self leveling rig is my choice of lifting wood strate up. I've used the '3 sling method' before with excellent results, when my eye & eye wasn't quite long enough to fit around a big spar.
I like the ease of using 1 sling.
I can't understand one thing. By using one strap, isn't most of the straps grip being applied 180 degrees from the side you're picking from? So why would you ever consider pulling up on that? Why not use 2 straps and attach a leveling link between them?
[/ QUOTE ]
Like I said in an earlier post, I cut notches for the sling to fit into, 90* from the choke.
Using 2 slings in a 'choking' fashion 180* apart and adding another to act as the balancer is a great method.
The self leveling rig is my choice of lifting wood strate up. I've used the '3 sling method' before with excellent results, when my eye & eye wasn't quite long enough to fit around a big spar.
I like the ease of using 1 sling.
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