Barberchair injury

Euro style is a sloping trigger cut, a dog's tooth cut. Comes in from above, like a homeowner back cut.

I don't understand why this cut would be preferred over a simple strap release from below. Cutting on an angle is "harder" than a horizontal cut because the cut length is now longer and in a different plane with the grain. I put harder in quotes because its kind of semantics. We're all hard workers and make slanted cuts for every notch we do but why add work where it isn't needed. Is anything gained from a slanted release?
 
i think of a Barber Chair as the weight from rear of face plunging forward;
And hitting unyielding obstruction serving as a wall of force, and neither force will give way.
So violates the constitution of the tree cylinder as a container of the force battle.
Giving a split decision between the parts.
.
This could be from no face, hard lean, internal fault,
or face with HORIZONTAL cut bypass of the slanted giving inertia force into essentially closed /no face(now). Slanted cut bypass horizontal is just another re-flex across fibers.
Horizontal bypass is close veritally thru column giving stop or crush command but won't crush nor stop and train keeps coming to train wreck.
.
This usually happens when tree not very far forward, more column than across force; but can get similar overload on hard lean that doesn't seem to move fast enough to give needed relief, unless preset hinge with trigger release. Center bore gives more relief yet maintains outer leveraged extremes. Arguments as to whether this also takes out the stiffer 'bone' core, leaving the younger more flexible outers.
.
Internal faults can conjure the beast also, for it is caused by tree not moving cleanly a a single monolith ; that can give this battle.
 
i think of a Barber Chair as the weight from rear of face plunging forward;
And hitting unyielding obstruction serving as a wall of force, and neither force will give way.
So violates the constitution of the tree cylinder as a container of the force battle.
Giving a split decision between the parts.
.
This could be from no face, hard lean, internal fault,
or face with HORIZONTAL cut bypass of the slanted giving inertia force into essentially closed /no face(now). Slanted cut bypass horizontal is just another re-flex across fibers.
Horizontal bypass is close veritally thru column giving stop or crush command but won't crush nor stop and train keeps coming to train wreck.
.
This usually happens when tree not very far forward, more column than across force; but can get similar overload on hard lean that doesn't seem to move fast enough to give needed relief, unless preset hinge with trigger release. Center bore gives more relief yet maintains outer leveraged extremes. Arguments as to whether this also takes out the stiffer 'bone' core, leaving the younger more flexible outers.
.
Internal faults can conjure the beast also, for it is caused by tree not moving cleanly a a single monolith ; that can give this battle.
Good stuff @useless info ... I admit to sometimes having a hard time fully understanding your posts (the fault is all mine), but this one is pure gold for me....Thanks for the insightful 3 dimensional look into the phenomenon known as a barberchair......
 
Natural barberchair (the best kind), was a live tree, rotted lower trunk, windy day took it down. Took me 3 hrs to release it, get it all on the ground and bucked up. Was pretty interesting, crown was mostly contacting the ground, the trunk was up overhead, jammed in a pair of small white oak and binding further out on another white oak. Was a nice chess match getting it done.

49640157547_06ba01fcd7_c.jpg


Bound up between white oaks
49639359298_7d2d0efcc2_c.jpg


Was also bound up just below the upper crown, when I released that the butt dropped off the stump/snag on the other end, then life got better.
49639884506_372f3d7e2b_c.jpg


-AJ
 
Good stuff @useless info ... I admit to sometimes having a hard time fully understanding your posts (the fault is all mine), but this one is pure gold for me....Thanks for the insightful 3 dimensional look into the phenomenon known as a barberchair......

Digging the gold here:
"So violates the constitution of the tree cylinder as a container of the force battle."

-AJ
 
i remember reading and being told, that any bypass of either facecut past the other could beckon BC.
Fair advice starting out actually; found it meant machining both faces as a woods craftsman to proper mechanix. (Also came to see rope as just softer fiber to arrange/machine right.)
In time tho, i split the 2 bypasses of 1 cut past the other (horizontal or slant); and actually found some usage for a vertical trench of slant bypass horizontal.
Less bolstering from the face in front/landing deck against forward movement
can force stronger hinge to make up the difference against same load.
Then, later thru the rotation the bolstering push back of the landing deck/lower face is restored.
Flexing across fiber is okay, that is flexible axis, but not so forgiving vertically thru fiber column!
.
To me, if orchestrated right, kinda like rope pull on falling to fake higher loading and get thicker hinge, then rope pull(or wedge push) is relieved to original loading with now thicker hinge.
Only hear, change starting support needs not by increasing load on hinge at birth temporarily, to instead temporarily handicapping to same end of hinge forced to make up difference. Then restoring original 'aid' of firmer push backwards from 'landing deck', only now with more hinge, as like thicker hinge when rope/wedge force relieved.
To me each strategy simply forced 'young' hinge to over-work to stronger, to then take on 'adult' work with more command from purposefully exercised stronger in youth as any other.
.
hingeFiber_2_by-pass.png

.
Speed is important tho, too little and can get stall, too fast train seems to kinda just bull dog thru, or perhaps just can't catch view of the effect. Have seen other cut styles that i think use same 'softer' then back to original firmness mechanix on forums.
.
Would say 'never' to use just full face horizontal bypass, well in felling; especially just single kerf face.
About like no face + speed IMPACT into shituation.
But, same in tree, to hop a smaller vertical top over fence etc. with the speed and not heavy enough to overload to an impenetrable wall of force back against rotation, can be very helpful!
And, as snap cut of horizontal branch with vertical kerf (across fibers just as horiz kerf across vert load) can have great utility.
.
Also on verticals, some horizontal kerf (push up column command)on heavy side, offers the 'offside' (D.Dent) as path of relief for all that rushing forward massive forces that Tapered Hinge as ballast can also be pulling towards in concert against heavy side. Dutches are more unpredictable, happen 'later in life'/rotation, Tapered Hinge is real welded in friend working all thru rotation until tear off on that side. Not keeping some connected fiber behind Dutch as anti-swivel with Tapered pulling hard gives what i think D.Dent was showing in Swing Dutchman.
.
It took many reads to understand his diagrams, and finding connections to Beranek's writings, as truly golden early 60's/70's commanding of the 50's invention of1 man chainsaw. Glad they went first, captured and then heart to lend; woulda been lost without them on much of this.
.
But, if i were teaching someone for first few years, would push to L-earn/master cleanly squared machined faces of no bypass. And not as right of passage just cuz i had to walk it, but rather gotta crawl before ya walk before ya run, or will most likely jump off edge of cliff, rather than magically, lightly across!
.
In some etymologies, 'so(u)rcerer' is one that can work the Natural source forces, and only became claimed as evil as an unacceptable non-religious power. That could be us some days..



Kinda cool when others take blame for my miss-takes
Rico/all, i've had this problem as long as can remember,
especially things created and worked over and over in quiet space in head;
then output .
Working in trees, earplugs and Bugz, everyone else below became my quiet space of study somehow.
i think i was always like that, only fortitude some growing up,
then some time in seminary, then yoga, meditation, philosophy, being a lil'different/alone;
also watching internal forces and channeling correctly thru own bod in gymnastics to output different effects, then visualizing same forces i knew so well internally to other things, all in own inner space.. all intensified the factors, to the present day mess...
Taught self vector drawing trying to compensate, i think Tom can detest first few years of 'crayon drawings' in msPaint as i reached out were very ruff!
.
 
Last edited:
...'crayon drawings' in msPaint...

I have some small, 10" netbooks that I usually use for online entertainment... they don't have the resources for full-blown graphics programs, so I'm stuck using Paint with a crappy, wireless mouse on a ten inch screen. It's awful.

I really need to bring one of the bigger machines over to this house. Trying to express complex problems/solutions with primitive graphic tools is like trying to cut down a Redwood tree with a dull butter knife. I like these little netbooks for their portability, but they're pretty wimpy.

...to hop a smaller vertical top over fence...

And, a Humbolt style facecut to drop it straight down, without any "up and out" motion, or flipping, when you have a target that the limb will hit if it doesn't drop smoothly down, staying fairly horizontal.

Love those jobs with no targets... can experiment on lots of different branch sizes, angles and weights and play with different cutting techniques to see what does, and does not, happen when they're used.
 
Yes!
But, then i think to for softer hits, not so direct to ground(receiver);
AND not directly feeding into harshest downward pull of gravity , but some across (source).
AND degraded by hinging machine/face forcing the sideways motion..
Forced thicker with push or pull etc.
Energy from fight of self side ballast Tapered Hinge binding against side lean,
>>would take some from equation of all 100% forward potential force, leave less down remainder from same force.
Dutch Slap ... If peak on waveform, anything less, tends to be less!
>>Only finite force as any other, can nickel and dime down some.
.
Some Guys get the okay to crush stuff, small buildings etc.
>>go crazy like payback, can smash what always fighting not to.
>>i tried to see how good i was, and not hit; in created or tested extreme shituation.
>>besides is good sense as far as CYA of NO backwash, even rumor hit building?
.
I remember 1 time after a hurricane, press down the road .
Supposedly insurance was going to pay for house, just get twin heaved trees down from over corner of house. An extreme Aha moment of , wow this stuff really, really works!
 
...the okay to crush stuff...

I'm removing some trees near a house that is going to be burned by the fire department for training purposes... I was looking forward to dropping something big on the roof, but the fire chief says they don't want holes in the roof. Apparently, it affects how the hose burns.

Rats. I was hoping for major destruction and good times. Oh, well. Another day, maybe.
 
I remember the first time I pondered a barber chair and the why of a bore cut plus trigger. If you picture a typical face and normal back cut as you get near the instant of chairing, before you get to the hinge thickness, the stem torque is focused on a thick hinge which amplifies trunk CofG x overcenter = crushed and stretched fibres at too thick hinge x width of overthick hinge. Easy to see how the stress is multiplied, quickly reaching shear failure size. So what about the bore cut? Same torque, same kind of wood and wood strength, if not less strength. You place the crush fibres at the hinge and place the stretch fibres at a guess perhaps 5x further out vs the overfat hinge chair failure geometry and voila you subject the wood to 5x less shear stress. So it holds together better/longer. The actual factor may not be 5 but its a substantial number maybe higher on a bigger stem or lower on a bitty tree. But it is derated a bit because the strap is not across a full diameter but a chord, and kind of sap wood not heartwood. On a conservative cut the strap may trigger like a snap cut nearly bypassed shearing the leave-in wood. On a nasty cut it may mini-barber up the strap or snap the strap in pure tension before you finish cutting it. En-gin-eering with one number and two math symbols. Just remember the torque advantage spreading the crush and tension fibres, 45 degree escape per Rico's video and keep your karma clean.
 
i think massive forces at lean solution has lack of relief speed
especially on hard head lean
>> so set hinge thinness to where you couldn't get to fast enough in normal felling
>>preserving rear trigger most opposing CoG direction
>>fast trigger into quick relief
.
Other popular scenario is reverse of soft lean into face obstruction/ full face Dutch etc.
>>shear downward force cosine creating wall of force
>>cosine drop very small just off of TDC area
>>BUT sine is most volatile change at this same stage
TDC of CoG over hinge pivot cos:1 sin:0
+15degrees from TDC (from high noon to 12:30 hr hand)
>> cos: .9659 almost/still 100% low impact of change EXCEPT speed multiplier
>> sin: .2588 WOW while cos dropped .03 impact (x speed)
>> sin: JUMPS from Zer0 to .2588 impact of change (x speed)
>>in popular E=MCsquared, C is the speed squared part, just been showing the M (total mass percentage exerted on ) part of change
>>speed squared impact of change is massive on cross axis , SQUARED x M change.
With our massive weight AND leverage multipliers in static stand is almost off most charts
>>Whallup to dynamic, and the impact of change at these regions can easily shear off the charts
>>even for our usually very trust wood container of force
>>that is destroyed by force overload just as burned wire, blown hose
>>all take equal/opposite force pair, just forces channelled thru different (now over loaded)containers/pipelines/connections.
.
cos giving shear downward wall of force from massive CoG creating force wall at shallow lean
>>while out of nowhere instantly getting an almost 10x impact of change across(sin)
>>so sin impact trying to throw thru the cos wall of downward force
2 massive competing bulls locked in the ring, neither giving away any ground
>>breaks out of ring(only other way is to sieze)
Want/need clean monolith movement, smooth, continuous force flow without such argument
>>or little man invading peace with noisy saw in land of the giants can get crushed and end up brownish red grease spot from too close to massive bull force explosion out of ring
.
Model also lends to internal faults/plates ,
>>incurring non-monolith seizing in some kind of battle of disagreeing, massively unforgiving parts
.
Same cut(s) in vertical or near vertical top, can give hop as not enough shear downward force to create massive force wall, and faster/narrower cut/throw thru
.
Full face kerf killer in felling, workable in horizontal workable in smaller
>>now no cos into stump, massive sin downward
.
Any reference line can be benchmark cosine single unique axis
>>and any other direction/axis is sine, all but the single cosine line, the non of cosine simply
>>cosine is single dimension reference line, sine is either of the remaining 2 dimensions around line for total of all 3 dimensions
So, from a support view, cosine is the unique line directly against force 100%, TDC with gravity load
>>any deflection from 100% alignment against load starts feeding some sine in
Thus from support stand point, i look at cosine, being to my cause(cos)
>>and sine, being the sin across, cutting across the cause(cos) line
Off of TDC of 0 deflection support cause(cos) efficiency starts dropping slowly
>>while sine ALWAYS jumps hard in same region, much more VOLATILE
So cosine is the requirement of the loading, i visualize as coming first, and sine as respondent
>>model prevails across to sound, electric, wind, water etc. waveforms
>>we say sine wave, but cosine wave always precedes by about 1/4 cycle
Called cosine/sine waves cuz waveform matches geometry ancients gave us!
>>from this fuller model it is easier for me to visualize our physical forces as more liquid
>>especially on impacts of change as sudden pulse of waveform forces
>>small vertical drop of wave form , but MASSIVE, SUDDEN change sideways
.
So i guess i'll play nice and not note Rico and good karma in same sentence!
 
Last edited:
Interesting aspect is introducing time dependence which to me implies chasing a cut. I figure best is keep everything static till the trigger. In our realm m v squared is more appropriate and definitely real but only in that a boogying trunk can pop hinge fibres or trunk fiber a bit more than static forces, depending on how fast you want large objects racing as you stay close and chase cuts. More than once I've had a chewy tree fall over and stop above the ground held by the hinge, saying "firewood me I'm on a pretend wood cutting stand". Even the dynamic energy didn't pop the fibres.

An observation is that the same torque pops a dutchman. Also a normal face cut is just a late in the swing material-in-the-contact-face-friendly dutchman that focuses the torque abruptly at face closing, with a boost from the m v squared energy. By the friendly part I mean there's little question the hinge fiber will fail catastrophically with nearly zero crushing of the face cut fibres, whereas a dutchman can let fiber crush deformations occur to let parts of the hinge fail at different times causing a side pull. Depends if you want that or don't. I sort of regard face cut as a continuum not standard vs mismatch/kerf. Make the cut for the job.

aside - I type fiber then I get finer or fibre jeeeez correcting over and over.....
 

New threads New posts

Back
Top Bottom