Swamp White Oak

[tod_k]

Thats right. They work well. All of them are about 9 months old with every day use. Norm just made me some 35' 9/16" amsteel{for a fee} for utility or heavy lifts. Longe ones seem better because of sling angles resulting in sling tensioin. And if you use Norms SER they become a countinous loop.

 

[tod_k]

Unforunatly I am A very visual learner. I do not see how to use one sling for 3 attachment point. 2 tree one crane?

 

[rich_h]

Another excellent job. I hope someday to get the chance to just sit and watch your crew in action....I bet it is poetry in motion. Of coarse it would be a whole lot more fun to be part of the crew. Very nicely done, and nice job with the slings.

 

[tod_k]

Tree was maybe 300. No other problems with the other oaks and there are many of them.

 

[Mahk_Adams]

[ QUOTE ]
This cut had to be perfect We were at our max and it is 5' from the house.It's rigged with 2 selft eqaulizing rigs 1 round sling and a spider leges with a cow hitch.

[/ QUOTE ]


Ever worry about the edge of the wood cutting the rope? In the photo that you had for quote above at least one of the spider legs seemed to be pulled against the edge at a fairly tight angle.

In the attachment to this (my) post we use the same SER, but with a single, Tuflex loop sling (choked and attached back to itself with a shackle). Tuflex is probably more abrasion resistant than tenex, but we put an old piece of carpet where the sling hit the edge of the previous cut.

Whatcha think? Is this an unnnecessary concern?

 

[Mahk_Adams]

Different view.

 

[tod_k]

For sure. Sling angle as you know are very important. And that was a pretty hard angle. Since the wieght was shared by seval slings I was not to worried. I try to keep sling angles no more than 60 degress. Good idea with the carpet or maybe old mud flapes.

 

[WPArborist]

Tod k

Sorry for the confusion.

I was asking why not use 1 sling and 1 spider leg. Run the spider leg from one stub through the hook or clevis to the other stub and then put the sling on the middle (largest) stub.

If this isn't clear I'll just give up, or learn to do diagrams on the computer.


WP

 

[tod_k]

I get it. Than seems to make sense to me. When lifting wood I like a hitch on both sides of the stubs or just a trunk to get a very controlled striaght lift. Plus when using a SER it's a countinous loop.

 

[WPArborist]

How does the continous loop give more control than simply using 3 spider legs tied to each section?

Sorry, there is something I'm not getting.


WP

Sorry, 1 spider leg to each section. Does that read better?

 

[Colin]

3 spider legs are overkill.

 

[tod_k]

Not if you want it to lift striaght up. If one used one or two slings on that log the piece would not sit level and large dynamic loads would have acurded.

 

[tod_k]

The countinous loop doubles they strenght of the sling.

 

[WPArborist]

Cool! Thanks tod k.

 

[Fred_Berkelhammer]

Tod,

I can't tell what knot you are using to attach your spider legs. Are they cow hitches?

 

[tod_k]

Depending on the length of the sling and the load that will be on it I,ve used cow hitches, double clove, bowline and even 2 half hitches. Most often a cow hitch.