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Main Boards => The Bowyer's Bench => Topic started by: Kevin A. on June 08, 2010, 04:31:00 PM

Title: Limb Twist
Post by: Kevin A. on June 08, 2010, 04:31:00 PM
This is my 3rd attempt at tillering (First one failed / second one good). I'm not sure if this one can be fixed or if so HOW. Any advice or help would be a great.
(http://i760.photobucket.com/albums/xx247/chappy56/IMGP0022.jpg)
(http://i760.photobucket.com/albums/xx247/chappy56/IMGP0023.jpg)
I hope these pictures are a help.
Title: Re: Limb Twist
Post by: 003sim on June 08, 2010, 05:20:00 PM
I would feed it into the chipper. LOL...
But you know that.
Title: Re: Limb Twist
Post by: bigcountry on June 08, 2010, 05:29:00 PM
Well, first what is it?   Is it backed, or a stave or a board?  You have several options from heating it to not even worrying about it.  Or you could make one side weaker.  

Is it like this also unstrung?
Title: Re: Limb Twist
Post by: Sam Harper on June 08, 2010, 07:35:00 PM
Looking at your bottom most picture, you should remove wood from the right side of that limb.  That will make the tip move over, and the string will line up better through the handle.  It'll reduce weight, though.
Title: Re: Limb Twist
Post by: Sam Harper on June 08, 2010, 07:37:00 PM
I wouldn't give up on the bow yet when you can at least experiment with it.  I had a series of badly misaligned bows for a while because I had a warped form I was gluing them up on.  So I did a whole lot of experimenting until I figured out how to fix it.
Title: Re: Limb Twist
Post by: George Tsoukalas on June 08, 2010, 08:07:00 PM
Kevin is this a board bow? Looks like you have some bad grain on it form what I can see on that lower limb which would cause that twist. At any rate, do what sam said on both limbs. Jawge
Title: Re: Limb Twist
Post by: George Tsoukalas on June 08, 2010, 08:11:00 PM
Kevin is tis a board bow? Looks like you have some bad grain on it form what I can see on that lower limb which would cause that twist. At any rate, do what sam said on both limbs. Jawge
Title: Re: Limb Twist
Post by: Kevin A. on June 08, 2010, 11:44:00 PM
Thank you bigcountry I forgot to put that in. It is an board bow, Osage / Bamboo, 68 inches long and I am looking for a 50# / 29". The little bit of tillering I did I had 50# at 24".
003 sim "Chip it"
Title: Re: Limb Twist
Post by: walkabout on June 09, 2010, 01:44:00 AM
yep id remove from the right side like sam said, you should be able to get it straight. if you used titebond, the idea of heating it to remove twist is probably out of the question.
Title: Re: Limb Twist
Post by: Kevin A. on June 09, 2010, 01:53:00 AM
Hello walkaout
I did not use titebond I used that Urac185. Can that be heated?
Title: Re: Limb Twist
Post by: walkabout on June 09, 2010, 10:24:00 AM
i havent ever used urac, so im not certain, but epoxies should have better heat resistance than titebond, which will  break down at around 150 degrees. id try to even the twist with scrapig first, maybe by then someone can say whether or not heating urac is a bad idea becuase im not sure.
Title: Re: Limb Twist
Post by: bigcountry on June 09, 2010, 12:04:00 PM
QuoteOriginally posted by Kevin A.:
Hello walkaout
I did not use titebond I used that Urac185. Can that be heated?
I wouldn't heat it.  I would just keep removing material off one side to make it weaker.  But be careful not to go crazy.  I did this with a kids bow and it broke.
Title: Re: Limb Twist
Post by: Kevin A. on June 09, 2010, 12:33:00 PM
Thank you all very much for your help.
I will scrap the right side (carefullly)
I just was not sure which side of a limb was the weak side.
Now that I figured out how to post pictures I will let everyone know how it comes out. That is if I don't break it.
Title: Re: Limb Twist
Post by: walkabout on June 09, 2010, 01:35:00 PM
the side which it pulls the string toward is the weak side, so you remove wood from the opposite side.
Title: Re: Limb Twist
Post by: Pat B on June 09, 2010, 04:54:00 PM
Feel the thickness with your thumb and forefinger and you will feel if one side it thicker than the other. If it is, remove wood from the thicker side of the belly and not the side of the limb.
Title: Re: Limb Twist
Post by: George Tsoukalas on June 11, 2010, 12:36:00 AM
Left side. Scrape the other side of both limbs. Exercise at short pulls and check tiller frequently. Jawge