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The Mechanics of Limb Twisting Explained - An Experiment
James Cargile:
I had two twist on me when I made them so I went and got a calliper boyh limbs were the same thickness and it ended up been the wood I used. It never did um twist for me during the tillering
It shoots fine and straight
And it looks fine till it gets drawn then you can see the twist in the limbs.
neuse:
First time to view this, very helpful post.
BowEd:
I'm rather late commenting to this good thread but I like it.I'm sure it'll help many future bow makers out there.
Ippus:
Wow, good thread. This is really helpful.
Ballasted_Bowyer:
With board bows, limb twist can also be caused by the wood fiber not following the center of the limb as it would in a split stave. Sometimes this is hard to see by visual inspection of the original board as it can occur in boards where all the growth ring lines appear straight. This is caused by the tree twisting as it grows. In tropical hardwoods it twists in reverse for half the year. The fix for this is to laminate the bow with two consequent slices of the same board and flip one over so that when the two lambs are laid side by side they are mirror images. Tiller by filing scraping sanding--no planes. Try to plan your design so that each lam is a similar thickness and the limbs will bend straight with some use of the above method.
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