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bow problem (Read 2156 times)
johan
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bow problem
Mar 21st, 2017 at 3:36pm
 
below is a picture of the problem, it happened during tillering, at a weak spot
it is located on the belly of the bow close to the handle
it doesn't seem to be just on the surface

how is it called?
how do i treat it?
how do i prevent it?
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Onager Lovac
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Re: bow problem
Reply #1 - Mar 21st, 2017 at 7:54pm
 
Those are compression fractures otherwise known as chrysals or frets,
They can result from uneven tiller, improper limb design or flaws in the wood, yours are very small, your bow should be fine.
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johan
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Re: bow problem
Reply #2 - Mar 22nd, 2017 at 3:56am
 
it seems it will only worsen.
i read somewhere that i can cut it out and glue another piece of wood.
has anyone tried it?
also i don't have another piece of wood like this so if i do it i'll probably use different kind of wood .
any tip will help
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Morphy
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Re: bow problem
Reply #3 - Mar 22nd, 2017 at 7:58am
 
On the belly by the handle. That's not uncommon.   I wouldn't cut into the bow,  I would get the bow limb bending evenly and go from there. If it becomes a problem I would personally just start on a new piece of wood. You could try and make a patch if it gets bad but unless the piece of wood is sentimental I've never seen the point.
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Bill Skinner
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Re: bow problem
Reply #4 - Apr 5th, 2017 at 11:09pm
 
I would put a slight reverse bend in the bow and then back it with something like a strip of linen or silk.

It will not fix the problem but it should stop it from getting any worse.

Do you know how to back a bow?

Try going to Primitive Archer, there is a primitive bow building forum, ask questions there.
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johan
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Re: bow problem
Reply #5 - Apr 7th, 2017 at 10:20am
 
the bow broke.
backed it like the Poor folk bows did (at the simplest bow)
i really don't know how to back with natural materials
also i hate that i can't find titebond or other american glues here Angry

thanks for the tips Smiley
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Bill Skinner
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Re: bow problem
Reply #6 - Apr 8th, 2017 at 1:58pm
 
Don't feel bad, if you aren't breaking them, you aren't learning.  I broke, probably, the first 10-15 bows I attempted.   Angry

As far as glue, is there a furniture maker or someone who re upholsters furniture near you?  They should have a decent source of glue for wood and fabrics.  And if you want to be really traditional, you can use unflavored gelatin.  You will have to waterproof it when you are done, though.
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Morphy
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Re: bow problem
Reply #7 - Apr 8th, 2017 at 2:10pm
 
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johan
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Re: bow problem
Reply #8 - Apr 8th, 2017 at 3:55pm
 
http://www.bison.net/en/products/651-wood-glues/product/248-super-wood-glue/

i used this glue^
with sheetrock tape like this http://poorfolkbows.com/oak5.htm

at the above bow it was clearly a belly wood failure.

but at other 2 bows i tried, it seemed that the glue stiffened the wood and made it crack .
or it could just be the wood (beech)

Bill Skinner wrote on Apr 8th, 2017 at 1:58pm:
you can use unflavored gelatin

i like the idea


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Re: bow problem
Reply #9 - Apr 8th, 2017 at 5:19pm
 
You can spread a thin layer of glue on a piece of paper and let it dry. Bend the paper and see if it cracks or seems brittle. White wood glue is usually ok for backing. Are you preparing the gluing surface before backing? Or it might be that the wood's grain is not good enough for making a bow even with a layer of sheet rock tape. (Never used the stuff so just a guess).
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johan
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Re: bow problem
Reply #10 - Apr 9th, 2017 at 2:02am
 
glue seems flexible
i think its a wood-glue reaction
a drop of water on beech and it leaves stain after drying.

which means that the glue might be good for backing other woods...
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