felling cuts

[josharb87]

Nah, 50% hinge, bore through leaving a 10% ear eitherside, back cut leaving sub 5% hinge, down she goes

[skyhuck]

you can remove up to a quater but try not to remove more or you could compromise the balance/leverage of the tree.

 

 

Please explain how a larger gob can "compromise balance"?????

[Dean Lofthouse]

Please explain how a larger gob can "compromise balance"?????

 

Dont know about balance but I think I know what he means re leverage Dave

 

Bigger the gob, the less wedge leverage you have.

[Highland Forestry]

Dont know about balance but I think I know what he means re leverage Dave

 

Bigger the gob, the less wedge leverage you have.

 

That's absolutley spot on... I had this with one of my lads last week..

If you're felling a largeish tree, it;s better to use a smaller gob if you know you are going to need wedges as you can knock them in further.

 

If you use too big a gob then after smacking the wedges in a little way they rest up against the hinge and then you're in trouble.

 

This is another reason we carry a 'specialist' wedge on some of our jobs

 

 

 

[skyhuck]

Dont know about balance but I think I know what he means re leverage Dave

 

Bigger the gob, the less wedge leverage you have.

 

I did not mention leverage.

[skyhuck]

That's absolutley spot on... I had this with one of my lads last week..

If you're felling a largeish tree, it;s better to use a smaller gob if you know you are going to need wedges as you can knock them in further.

 

If you use too big a gob then after smacking the wedges in a little way they rest up against the hinge and then you're in trouble.

 

This is another reason we carry a 'specialist' wedge on some of our jobs

 

 

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If you cut a bigger gob you will require less lifting force from the wedges, as you have gained mechanical advantage by moving the fulcrum back.

 

If you think you may hit the hinge simple bore cut out a path for the wedge.

[Highland Forestry]

If you think you may hit the hinge simple bore cut out a path for the wedge.

 

 

I have witnessed that going very very wrong and when the wedge went through the bore it caused the tree to snap off the hinge..

Needless to say the tree went down in the opposite direction to where they wanted it - it was in the wood so no harm done but it serves as a reason why I would rather have a smaller gob and have plenty of leverage through the backcut.

[skyhuck]

I have witnessed that going very very wrong and when the wedge went through the bore it caused the tree to snap off the hinge..

Needless to say the tree went down in the opposite direction to where they wanted it - it was in the wood so no harm done but it serves as a reason why I would rather have a smaller gob and have plenty of leverage through the backcut.

 

Sounds like there was insufficient hinge.

 

If you are happy doing things your way great.

 

I have never had a tree go back on me.

 

I was asking for an explanation as to why the tree will become "unbalanced" by a large gob.

 

I believe small gobs are a leftover from conserving timber and have very little to do with safe felling.

[18 stoner]

If you cut a bigger gob you will require less lifting force from the wedges, as you have gained mechanical advantage by moving the fulcrum back.

 

No Dave, i dont see it that way.

 

Say, if felling a back leaner of 4 feet wide at the felling cut you set a gob 1/2 way into the stem instead of say 1/4 of the way in, you will have increased the leverage required by 1/3.

 

However, the mechanical advantage will have been increased by 1 foot, when the center of gravity could be several feet behind the hinge. Therefore, hardly making any difference in mechanical advantage.

[Highland Forestry]

 

If you are happy doing things your way great.

 

 

 

I am