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Author Topic: ohhhhh! The Carnage!!!  (Read 6583 times)

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Offline M-P

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Re: ohhhhh! The Carnage!!!
« Reply #15 on: October 13, 2009, 03:07:45 pm »
It looks to me like the backing had a small defect at the top edge ( in the picture.)  That defect plus the run off in the belly probably combined to cause the break.  The pictures look mostly like a tension failure to me, so I would blame the backing first.   Ron
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Offline adb

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Re: ohhhhh! The Carnage!!!
« Reply #16 on: October 14, 2009, 12:47:21 am »
I've had bamboo fail on BBIs, just like that.
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Rich Saffold

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Re: ohhhhh! The Carnage!!!
« Reply #17 on: October 14, 2009, 01:22:19 am »
When they go with a "bang" its the bamboo, and I do think you probably overcooked it a bit.
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Offline Easternarcher

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Re: ohhhhh! The Carnage!!!
« Reply #18 on: October 14, 2009, 07:37:47 am »
Quote from: Tom Leemans on October 13, 2009, 10:25:27 am
just curious, how thick was the boo?

Update on thicknesses.
Boo was 0.173in. at the point of the break...
IPE was 0.225 at the same location.

I think a combination of grain run-off and possible fault in the boo backing caused all this. Sure woulda made a nice bow...
But I'm back in the saddle so to speak. Straigthening a piece of Osage with better grain BTW right now. Will be glued-up tonite. Clean-up and start tillering tomorrow nite. This bow must be completed by the weekend. I promised! :P
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Offline medicinewheel

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Re: ohhhhh! The Carnage!!!
« Reply #19 on: October 14, 2009, 07:50:15 am »

Glued up a blank in a hurry last sunday.
Maybe....just MAYBE I will be able to save it and turn it into a bow!
When you are in a rush, the wood becomes your enemy,
no matter laminated or self bow,
No matter which part of the whole process you might be in!
(After 24h the glue might not even be cured well enough)
JMO!
Good luck if you try anyway.
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Frank from Germany...

Offline Easternarcher

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Re: ohhhhh! The Carnage!!!
« Reply #20 on: October 14, 2009, 09:05:10 am »
Quote from: medicinewheel on October 14, 2009, 07:50:15 am

Glued up a blank in a hurry last sunday.
Maybe....just MAYBE I will be able to save it and turn it into a bow!
When you are in a rush, the wood becomes your enemy,
no matter laminated or self bow,
No matter which part of the whole process you might be in!
(After 24h the glue might not even be cured well enough)
JMO!
Good luck if you try anyway.

If the glue-up was sitting at room temp. I'd agree with you, but I throw the whole thing in the hotbox at 120-140deg. overnight, so from what I understand....that should do it.
Yes, I must be careful with what I do here...stay tuned!
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Offline 1/2primitive

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Re: ohhhhh! The Carnage!!!
« Reply #21 on: October 14, 2009, 05:07:37 pm »
Question: was the bamboo completely flat on the inside? Or was there a little bit of concavity to it when you glued it up?
      Sean
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Offline Easternarcher

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Re: ohhhhh! The Carnage!!!
« Reply #22 on: October 14, 2009, 07:45:33 pm »
Quote from: 1/2primitive on October 14, 2009, 05:07:37 pm
Question: was the bamboo completely flat on the inside? Or was there a little bit of concavity to it when you glued it up?
      Sean

No concavity. As flat as I could make it on the belt sander.
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