19" oak removal

Daniel

Daniel

Carpal tunnel level member
Location
Suburban Philadelphia (Wayne)
19\" oak removal

This link was posted on the balance point rigging thread on the rigging forum, but was never properly posted here on the video forum... Here is is for those that missed it.

http://www.youtube.com/watch?v=cuBRXDTpzFE

There's been quite a bit of discussion about these techniques on the rigging forum..

One commment on the last cut shown. That was a different tree and climber. It looks like the limb swings back towards the climber, but that was only the camera angle.

The lowering line was hanging perfectly verticle from the overhead natural crotch rigging point.. So it see-sawed on the near balance point, which was 12-15' from the climber.. No movement at all back towards him.. All that riggin was set from the gound with a throw line... Climber just made the cut...
 
Re: 19\" oak removal

Nice!

I like that you did the climbing on this one Daniel. Smooth lowering. I think the correct balance point and the proper hinge cut to steer the piece in the desired direction are executed excellently here! Way to go.

Eric
 
Re: 19\" oak removal

Just wanted to give this thread a bump... and say that I had a rope break on another removal some time after this video was made and it was in part casued by a force multiplier related to near-balance point rigging.. AS long as the limb is still on the hinge, the branch tips can act like a giant lever pulling down on the rope, which can create a lot of force on big pieces, once all the stretch is out of the line.

This is the point Jomocco was trying to make in the balance point rigging thread. So one has to be careful... Yes you are going to reduce shock loads, but still there is a force multiplier involved..
 
Re: 19\" oak removal

[ QUOTE ]
Just wanted to give this thread a bump... and say that I had a rope break on another removal some time after this video was made and it was in part casued by a force multiplier related to near-balance point rigging.. AS long as the limb is still on the hinge, the branch tips can act like a giant lever pulling down on the rope, which can create a lot of force on big pieces, once all the stretch is out of the line.

This is the point Jomocco was trying to make in the balance point rigging thread. So one has to be careful... Yes you are going to reduce shock loads, but still there is a force multiplier involved..

[/ QUOTE ]

Wow. Thanks for the integrity Daniel.

How large/heavy would you say the limb was?

What rope were you using? What was the condition of it?

Did the rope snap mid line or at a knot?
 
Re: 19\" oak removal

[ QUOTE ]
AS long as the limb is still on the hinge, the branch tips can act like a giant lever pulling down on the rope, which can create a lot of force on big pieces, once all the stretch is out of the line.



[/ QUOTE ]

funny you should say that, I just yesterday was explaining this to our other climber, but in regards to crane rigging.

that, if the hinge wood is still connected, if the shape and balance of the top was off, that I think that the rotating peice (still attached) could use the leverage/length of the peice to actually put more pull on the crane than what the peice actually weighted. I've never heard or read of this discussed, but it popped into my head while doing some crane picks yesterday. It made sense in my head. I can draw if I'm not clear on what I'm saying.
 
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