Author Topic: Fixing a Hinge- When all Means Fail.........  (Read 12994 times)

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Offline JW_Halverson

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #30 on: May 13, 2014, 12:23:34 pm »
A good rule of thumb is that if you see a hint of a hinge at brace, it won't go away if you draw it back farther.  >:D
 

What doesn't kill me makes me stronger....does NOT apply to tillering limbs!

Yeah, that hinge on the right is pretty grievous.  The left limb would be salvaged, though losing a fair amount of draw weight.  But to catch the rest of the bow up to the hinge at the right fade out is going to cost a lot of draw weight.  Ok, life will go on. I say keep working on it, nothing worse can happen from here.  Just understand you may be "fixing it to death" ultimately. 

Before you go any further, go over the bow with a fine tooth comb and critique your glue up, the design, the execution of the design, any fine detail you can think of.  Learn everything from it you can.  Every bow should be a graduate level educational experience, even if it doesn't survive the process!

Good luck, brother!
Guns have triggers. Bicycles have wheels. Trees and bows have wooden limbs.

Offline Bogaman

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #31 on: May 13, 2014, 04:08:08 pm »
The handle area looks much to wide. How far have you got between the fades?

Offline Crogacht

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #32 on: May 13, 2014, 04:38:30 pm »
It looks to me like the back of the bow actually dips slightly (almost like a small dent) just on the edge of the handle there on both sides. Not sure what that's about.

Offline RT

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #33 on: May 13, 2014, 07:57:21 pm »
http://s43.photobucket.com/user/robt188/media/Mobile%20Uploads/2014-05-07140505_zps2b9c8516.jpg.html" target="_blank"><img src="http://i43.photobucket.com/albums/e356/robt188/Mobile%20Uploads/2014-05-07140505_zps2b9c8516.jpg" border="0" alt=" photo 2014-05-07140505_zps2b9c8516.jpg"/></a>

This is the correct pics , left limbs where there is a maskin tape is the hinge area, left and right of the tape are the weak area.....
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Offline PatM

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #34 on: May 13, 2014, 08:25:10 pm »
Wrong pic all along? lol.
 What exactly happened to cause those little divots? Power tools?

Offline DarkSoul

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #35 on: May 13, 2014, 08:55:28 pm »
You initially just posted the link to your PhotoBucket library (well, the link is almost working). I just had to guess that the most recent upload would be the bow that you were talking about. Since it fit a boo backed bow with a hinge, I presumed that is must have been the bow you were referring to. Wrong assumption.
The new picture (link to pic) shows a much better tiller. But there is still a complete lack of accurate information, RT. We need to know more info about this bow and your methodology before we can give you detailed advice. As you can read in these three pages, everyone is just guessing and making assumptions. So I'll refrain from giving you any advice about the tiller of this bow before we receive more information. Wood species? Unbraced profile? Technique used for laminating? Powertools yes or no? How did you tiller? Width? Draw weight? Is the belly flat?
"Sonuit contento nervus ab arcu."
Ovid, Metamorphoses VI-286

Offline RT

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #36 on: May 13, 2014, 09:26:39 pm »
sorry for the confusion guys, i am new to posting pictures on PA linking it to photobucket.....

My reply #33 at 5:08:09 pm is the correct pics......regards... ;D
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Offline RT

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #37 on: May 13, 2014, 09:41:15 pm »
Hi DarkSoul, the materials use are boo backing, maple core, riser and belly in boo......no, belly is raw boo backing thus not flat. bow is 59" NTN and form is 4" reflex after the glue dried. The core is pretillered before glue up and belly and back boo is 1/8"

all these are built using hand tools. hope i have cover almost all details.. ;D
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Offline PatM

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #38 on: May 13, 2014, 10:00:41 pm »
 The problem is that the chosen glue-up is basically un-tillerable after it's glued up. Have you done some regular bows first?
 There are a couple of guys on here or Paleoplanet who specialise in boo back and belly bows that can better help you with this type of bow. You really need to work out your tapers.

Offline DarkSoul

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Re: Fixing a Hinge- When all Means Fail.........
« Reply #39 on: May 14, 2014, 06:33:14 am »
Ok, well, we are getting some more necessary info. Boo belly huh? You didn't tell us that important thing before! :P This requires a totally different approach than a "all wood bow". Bamboo is not wood, by the way...
Since this bow has 4" of reflex, I still need to see an unbraced picture before I can judge the tiller. If the reflex is located AT the presumed 'hinge', you have a problem. Unbraced profile should match the full draw profile of any bow. 59" is also pretty short, at least for a 28" draw length.
As PatM said, since there is round, raw bamboo on the belly, you cannot tiller this bow the conventional way. You can only side-tiller a little bit, but not much. With such a bow, it is essential that you pretiller the backing, pretiller the core, AND pretiller the belly bamboo! You must pretiller all laminates before the glue up.

A build-along can be found here. Read all you can about the subject.
"Sonuit contento nervus ab arcu."
Ovid, Metamorphoses VI-286