For cases where it's not entirely clear which part of a downed tree is in compression and which part is in tension, I saw a good tip for using a "tongue and groove" cut while bucking to determine how the tree wants to move here:
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Jump to 41m46s from the beginning...
Looks like a neat trick for when you're not sure what the tree will do when severed...
Ok, I watched the part you where talking about... don't do this if you plan on selling any of it, or at least not the way this jack ass is.
There is a bunch that he is correct and safe about, but a bunch that is ridiculous and over bearing, like the kung foolery pose every time he cuts, you should be on firm footing but come on...
anyway, don't limb like him either, cut em long if you have to (it makes life easier on some) but slick em off like a good barber, leaving all them pig ears is just more **** someone else has to clean up later, or more weight for the truck to drag around for no reason. When you get some of them under limbs, judge the forces on em, then just nibble a bit of the compression side, and torch off the tension side, maybe at an angle if need be, but shaving it off like that is a complete waste, stay clear of it yes, but its not magic its not going to jump out and bite you fer ***** sake, log may roll yes, but that can and will happen at anytime for any reason.
As for situational awareness, yes... at all times...
anyhow, back to the original question,
Bucking,
Way I do it, that makes life a whole lot simpler is mark em as I limb, this does 2 things, takes off as much weight as possible, and allows me to rethink my lengths as necessary, 2 36's and a bunch of top, or 1 36, 1 30, and a 16? etc key is to maximize the wood, cutting everything at x length can and will hose you eventually
then I will usually buck from the top down, the top being the lightest bit, will have less effect on the situation, then work my way back to the butt, where I can retrieve my wedges and axe and move on to the next.
Judging bind/tension/compression etc comes with time. Generally though I will cut the compression side until it starts to move (its very slight but noticeable) then cut the tension side until its free, with a few various techniques depending on each situation, like big wood cut as much of the far side as possible, then compression-tension, Boring Is reserved for cutting whatever side is near dirt if it needs cut first, purely to keep the chain out of the dirt (and I fail at this often). the whole trick is to give somewhere for all that energy to go, hence cutting the compression side first.
Its even necessary to put in a small "face" from time to time if you have say a whole bunch of wood hanging off one side and don't want to slab it off (like a chair but on the ground)
Your going to have a pinch, if you haven't had one yet, wedges help, a second saw is mandatory... never cut without a back up if for any reason then just this.
things the video didn't show, is getting trees wound around multiple obstacles putting massive side force on em, its very important to relieve that pressure in the correct manner, yet another reason I limb and then buck, ******* this up could mean a nasty swinging tree that takes out your legs and chucks 30' into the bushes never to be seen again, best thing to do is remove as much weight as possible, and buck as much other wood as you can off, then cutting from the compression side buck at the sketchy bit, so that the wood jumps away from you...