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Author Topic: Del's Heartwood Yew Primitive- FAIL  (Read 14314 times)

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Offline JW_Halverson

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Re: Heartwood Primitive FAIL
« Reply #45 on: April 29, 2016, 12:40:33 pm »
Quote from: joachimM on April 29, 2016, 07:52:51 am
A singularity is hardly the same as a general rule.

Joachim

That is a quote I am going to post over my workbench! 

In training raptors, we often speak of a bird as  "case study of one"  because while there are general rules that apply, we have to be ready to throw out any rule that is not working and be ready to do that on a moment's notice. 
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Guns have triggers. Bicycles have wheels. Trees and bows have wooden limbs.

Offline Del the cat

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #46 on: April 29, 2016, 01:47:12 pm »
Quote from: bjrogg on April 29, 2016, 12:22:46 pm
Del I'm looking at picture and wondering if that crack didn't come from pin knot on side of bow it seems to be headed in that direction. I'm not there and some times picture can be deceiving.
Yeah, I think the pin is the focus for the stress, but the whole stave is weird, it's not following a ring and at some points its more like quarter sawn.
This post from my blog shows the first crack, which also comes from a pin, but is much smaller... presumably having patched that and removed one weak point then the next weakest point gave way, still pretty cool that it didn't simply explode.
Del
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Offline PaulN/KS

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #47 on: April 29, 2016, 08:02:42 pm »
Perhaps the fact that the bow did not explode puts it the category of a "Successful Failure"..?  ;)
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Offline crooketarrow

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #48 on: April 29, 2016, 08:30:31 pm »
  SWEETTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT AS ALWAYS DEL.

  I envy those that live in yew country. I've always love to hike and pick the trees for staves. All the hard work to get a tree, thought the process, they got to sell able staves. I've cut trees for as long as I've built bows for 23,24 years. I've cut every tree, got them home, split, store them all as if they were mine.

   I've cut tree's in 5 states but never in yew country.

  AWSOME BOW DEL, I LOVE YOUR STYLE.
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Offline George Tsoukalas

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #49 on: April 29, 2016, 10:03:07 pm »
I hope she holds for you, Del. Jawge
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mikekeswick

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #50 on: April 30, 2016, 02:27:32 am »
Grain violations!
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Offline Del the cat

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #51 on: April 30, 2016, 03:03:05 am »
Quote from: mikekeswick on April 30, 2016, 02:27:32 am
Grain violations!
The only place where there are any violations across the bow, is the place where it hasn't cracked!
The bow is sort of hanging off the edge of the log, you can see sapwood on the edge of the limb and is for most of its width almost quarter sawn.
I don't think grain violations have anything to do with it. Maybe that part of the back too some heat tho' when I was heat bending the grip to get the string line. (It's pretty close to that area)
The sketch shows how the limb sits in the log, you can see top right it is following a ring, but the left side is about 1/4 sawn.
The shape of the log gave me little choice.
Yeah I realise I've drawn an elliptical log :-[, but I couldn't be bothered to re-draw ::)... it illustrates what I'm on about and it does show the centre of the log exposed on the belly which is how it is in reality.
Del
« Last Edit: April 30, 2016, 03:19:27 am by Del the cat »
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Offline BowEd

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #52 on: April 30, 2016, 10:26:10 am »
Kuddos for hanging and staying in there with this piece of wood.Patches etc.Good learning experiences for the future.This may or not be related but bows that I've fixed from chrysaling on the belly have always come back to haunt me insidiously over time and shooting.With the back being the issue here rawhide or a light sinewing may be the cure like said earlier.
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BowEd
You got to stand for something or you'll fall for anything.
Ed

Offline Del the cat

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #53 on: April 30, 2016, 12:29:23 pm »
Cheers, I've got some dog chews and hide glue "pearls" soaking, ready to have a go tomorrow.
Del
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Offline PaulN/KS

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #54 on: April 30, 2016, 01:44:43 pm »
Never give up. Never surrender...  ;)
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Offline wizardgoat

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #55 on: April 30, 2016, 03:45:00 pm »
Del, that's a shame but you  always seem to find a solution.
I have some yew staves where I needed to ditch the sapwood, I still haven't had the courage to do an all heartwood bow, although I'm not sure why.
A sinew patch I'm sure would do it.
I've done a couple yew bows with 1 - 1.5 layers of sinew, and even that small amount of sinew on yew is very noticeable in keeping a profile, and adding some speed (and insurance)
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Offline Del the cat

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #56 on: April 30, 2016, 03:53:49 pm »
Hi, yeah sinew is sort of on my to do list!
I've got a bundle of deer leg sinew somewhere...
Del
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Offline bow101

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #57 on: April 30, 2016, 06:35:09 pm »
Quote from: PaulN/KS on April 29, 2016, 08:02:42 pm
Perhaps the fact that the bow did not explode puts it the category of a "Successful Failure"..?  ;)

That sounds like a fart that does not smell.
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Offline PaulN/KS

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #58 on: April 30, 2016, 07:43:42 pm »
Quote from: bow101 on April 30, 2016, 06:35:09 pm
Quote from: PaulN/KS on April 29, 2016, 08:02:42 pm
Perhaps the fact that the bow did not explode puts it the category of a "Successful Failure"..?  ;)

That sounds like a fart that does not smell.

It's an engineering expression. (The former as opposed to the latter...)  ;)
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Offline Del the cat

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Re: Del's Heartwood Yew Primitive- FAIL
« Reply #59 on: May 01, 2016, 02:07:25 am »
Quote from: PaulN/KS on April 30, 2016, 07:43:42 pm
Quote from: bow101 on April 30, 2016, 06:35:09 pm
Quote from: PaulN/KS on April 29, 2016, 08:02:42 pm
Perhaps the fact that the bow did not explode puts it the category of a "Successful Failure"..?  ;)

That sounds like a fart that does not smell.

It's an engineering expression. (The former as opposed to the latter...)  ;)
One of my fave's is "Mended beyond repair"... which is maybe the way this one is headed?
Del
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