tillering problems in Archery: Theory, and Scientific Discussion Forum Forum

Traditional Bowyer's Bible Books By Jim Hamm

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tillering problems

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jayrod	tillering problems	Lead	[-]
Posts: 50 Jan 9 12 3:45 PM Reply Quote More My Recent Posts	Tags : None I am currently tillering a 48" ntn flatbow. It is 3" wide at the fades and 3/4" wide at the tips, piramid shaped, with an 8" stiff handle. The draw length and weight is 30lbs. @ 24". This is a board bow that is nearly flat ringed. Because of the roundness of the rings combined with the flat board makes one edge of the limb flat ringed while the other edge is more bias ringed. I say this because I think it maybe contributing to my tillering problems. I have made a few successful bows, though never this short, and have read and reread every tbb book, esspecially the tillering chapters. I don't think it matters to my problem but I'll add anyway that I have been using the mass theory, calculating to be overdawn to ensure safety and durrablity. Now to the problem, at first, while tillering, I was being careful to keep both edges exactly the same thickness so that the limb would not twist, unfortunately it began to twist as soon as it was strung for the first time. When I looked down the limbs I could see that it was due to one edge bending more than the other, so to correct the problem I began removing wood from the area that was not bending as much. Then I exercised the limbs and rechecked the tiller but there was no improvement, so I tried again. now I have done this three times with no change except that one edge is quite a bit thinner than the other. I am worried that if I continue I will ruin this bow, and was wondering if any one had any advise.
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badger5149	Nocks	#1	[-]
Posts: 5348 Jan 9 12 4:54 PM Reply Quote More My Recent Posts	Jay, your nocks are quite wide, try cutting them deeper on the weak side and see if this helps. If it does you can just trin down that side of the limb once you are done tillering.
jayrod		#2	[-]
Posts: 50 Jan 9 12 8:15 PM Reply Quote More My Recent Posts	Do you think that the string might be putting a twisting force on the nocks? I'm using a timber hitch on both ends and I am getting the same problem on both sides but in different directions. I don't know if it makes a difference but when unbraced there is no twist.
badger5149		#3	[-]
Posts: 5348 Jan 10 12 4:42 AM Reply Quote More My Recent Posts	Timber hitch very well may be causing the twist

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Traditional Bowyer's Bible Books By Jim Hamm

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