snap cuts on horizontal limbs, canopy

Re: i never hear nobody talkin \'bout it

good comments Tom. side loading would be a concern and yes, the climber needs to be aware of the fact he/she has to be able to lift the piece up and off the crab without too much struggle. But this helps avoid the cut, hold and toss scenario.

could you elaborate more on the load releasing hitch idea? possiply some crude sketches or photos? I'm not too sure that i'm picking up what you're putting down.
 
Re: i never hear nobody talkin \'bout it

it would be one thing to sling a piece or two while you learned the snap cut, but all this talk of munter hitches, carabiners, etc? the whole point of the snap cut is to avoid all that crap. If the consequences are too critical, or your skill/judgement are questionable, by all means, rig the piece... and there are an endless variety of ways to do that.
 
Re: i never hear nobody talkin \'bout it

Phil...google will be able to answer way better than I can.

Sp,

Agreed, for the most part. Most of the time a snap cut is a snap cut. But there have been times when I've used slings AND a snapcut to control a drop. As usual, there is a little thread hijack here...sometimes it's easier to not start a whole new thread.
 
Re: i never hear nobody talkin \'bout it

[ QUOTE ]
I think that "snap-cuts" are pretty ineffective in crane removals. Whenever you force a crane to move a piece, you're introducing more dynamics than you need to. I mean, it's nearly impossible at times to eliminate the need for boom movement, but a majority of the time you should be able to figure out your rigging and cuts out well enough to just cut straight through smoothly.

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trees4est
That video is a good example of when to use snap cuts with a crane. The tree was suffering from die-back which resulted in falling debris during most of the lifts, so it made sense for me to get out of the way.

While straight through cut can work beautifully at times, you are stuck there for the duration of the lift. If there is ever a problem i.e. incorrect balance or boom position perhaps, you could be in trouble. Once while finishing my second cut during a lift, I glanced over to noticed that the crane operator was looking in the opposite direction while talking on his cell phone, not good but it happens.

As for the extra dynamics involved with snap cuts, well I suppose that depends on the cutter, crane operator and lift capacity. My regular crane driver generally regards what I'd consider a shock-load as significant as a pi-s in the ocean in his reality. Excuse the analogy.
 
Re: i never hear nobody talkin \'bout it

[ QUOTE ]

That video is a good example of when to use snap cuts with a crane. The tree was suffering from die-back which resulted in falling debris during most of the lifts, so it made sense for me to get out of the way.


[/ QUOTE ]
I can see that reasoning, sure. I can't think of any other time you would want to use it, though. But, maybe I'm not imagining enough.
As far as being within capacity, even if you are well within limits, having picks flop around can create problems, like catching the load-reading wires (whatever they're called)if they are external, or having part of a limb get knocked off when it hits the boom or cable, whatever. It's kind of like leaving stubs, maybe it's fine many times, but it's going to bite you in the end eventually.
 
Re: i never hear nobody talkin \'bout it

[ QUOTE ]
but it's going to bite you in the end eventually.

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Well it hasn't even come close to biting this climber, but I'll consider your concerns anyway.
 
Re: i never hear nobody talkin \'bout it

Beautiful work on the chestnut!

jp
grin.gif
 
Re: i never hear nobody talkin \'bout it

I use snap/bypass cuts a lot with the crane now where I didnt before. There should be less shockloading in my opinion. The crane should be lifting the piece off not yanking it. If there is a slight roll of the piece the movement of the crane dampens the shock loading. Also I am able to move before the piece is lifted if I want to.
 
Re: i never hear nobody talkin \'bout it

So in other words you are saying a bypass cut is as easy or easier on the crane than just cutting right tru in one pass, and it also allows you to be out of the way more when the piece is picked instead of being right there having just finished your cut.

Right?

If so I'll have to try those with crane work. I usually just cut thru in one pass and its always been fine but you are left a little close to the action.

So breaking the bypass is basically no stress on the crane?
 
Re: i never hear nobody talkin \'bout it

Cory... Breaking the bypass shouldnt be stress on the crane unless the cuts are too far apart. The only time I am using a straight thru cut now is if I need to let the piece being cut twist or turn alot first. I have been using spider legs a lot so I dont have the piece moving much at all.
 
Re: i never hear nobody talkin \'bout it

When I have had the cuts too far apart usually I can break the wood by moving the piece toward the direction the higher of the 2 cuts (on verticle pieces)this breaks the wood but the stem stays in place until lifted.
 
Re: i never hear nobody talkin \'bout it

Here's a pretty good example of a near horizontal lift.

Judging by the sound, these cuts were borderline too far apart but it made little difference to anyone. An easy balancing point also meant that no time or effort was spent setting up slings all over the place, and even if I had got it slightly wrong I'd have still been well out of harms way during the lift.

With a straight through cut the slings/balance/pre-tension would have needed to be right on the button. I think both techniques have equal merit overall, but for speed and climber-safety, the snap cut is an easy one to master.

Cranes are beautiful aren't they
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http://video.google.co.uk/videoplay?docid=-1095961566416913391&hl=en-GB
 
Re: i never hear nobody talkin \'bout it

If all goes well....this one is 2 houses down...I dont think the crane will even have to reset
 

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Re: i never hear nobody talkin \'bout it

Thanks Mangoes, although that editing facility can flatter to decieve
grin.gif


Best of luck arbor101, hope they all come off.
 
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