Rate My Hinge.

[Sam Thompson]

Just read you signatures "JammyShoddyTreeServices". Whoops!

[Xerxses]

felling cut is level or slightly lower than bottom of gob

 

Never heard that felling cut should be lower than gob cut, whats the theory behind that?

 

Look at my previous post about confusing things... hopefully it is clear othervise I will try to explain again.

[Xerxses]

3rd one was a horrible willow straight fell on a building site with a big pile of rubbish infront of it. i bored in got the level hinge and came out the back stuck wedge in and away it went. wasnt a side leaner theory behind things you've lost me im affraid got a different pic of it if it helps though.

 

Hm, not sure how to explain... Did the tree fall EXACTLY where you aimed at, or did it land slightly to the left or the right from your target point?

 

If the tree is sideweighted (not nesseserily a sideleaner) the hinge will be exposed to compressionforce on that side and pullingforce on the other. If the tree is dead straight, the whole length of the hinge will be exposed to the same force the whole time, mainly pullingforce as the fibres are bending while the tree is beeing forced forward during the falling of the tree.

But on the sideweighted tree its different. When the tree is being forced forward the hinge fibres will start to bend but as the fibres on the compressionside is being exposed to too high forces those fibres vill break before the ones on the pulling side of the hinge, and thus making the tree twist, ever so slightly, and the tree lands slightly to the side of where you were aiming.

Hope that claryfies things:blushing:

Obviously there wasn't a problem on the tree you felled in the pic, but if you were to fell 90ft firtrees the top might end up a couple of feet wrong or you might get a hung up tree! This can be avoided by inserting a wedge just behind the hinge and give it a few whacks ( and lift a couple of hundred kilos). Lets say the hinge is subject to a 200kg compressionforce (the fibres will then break as soon as they are exposed to any bending force) but if you apply a lifting force of 300 kg (300-200=100kg) you will instead have 100kg of pullingforce and the hinge will hold and lead the tree all the way down and only break off as your gob closes.

[tim Ber]

this is a 40' poplar i cut with 24" trunk only pic i could find rate me gently:001_huh:

[Matt Butler]

looks good mate, a heck of alot better than the one i felled today

[Tommy_B]

Little one.

[Mark Bolam]

Todays dead Oak. 60' at tips. 2' dia. Stripped out and felled as 20' pole. 10' left for mill, rest chipped, logged and tipped. Good day. O2O for scale, not fell!

[18 stoner]

You deserve 110% for that one with that saw Mark. Very clever!

[Mark Bolam]

It has a 6" strap on mate....

[felixthelogchopper]

It has a 6" strap on mate....

 

Do you mean yourself?