Hinge

[wood carver 2]

I was working on a longbow for a Christmas present today and things were moving right along until I strung it up. It looked like there was a bit too much bend at the tips, so I thought I would remove more wood from the rest of the limbs to even things out. I only removed wood from the fades out to about mid limb. Then I strung it up again and I saw the lower limb hinging badly about 8 inches from the tip.
Here it is on the long string.
 
I unstrung it and it went back to it's original profile right away.
 
This bow is bamboo backed and bellied with a purpleheart core and a thin walnut power lam. 68 inches tip to tip and 1 3/8 inches wide at the fades.
Is there a fix for this or is it bandsaw fodder?
Dave.

[John Scifres]

Remove wood from above and below the hinge until it is gone.  Watch the other limb to make sure it stays even.

[wood carver 2]

Thanks John.
What causes a hinge like this? The limbs are both evenly tapered and the core lam is free of defects and is symmetrical in both limbs. The only work I did before noticing the hinge was to sand to my profile and round off the edges a bit to prevent splinters during tillering. Could it be a weak area in the wood?
Dave.

[LittleBen]

Changes in limb thickness cause exponential changes in limb stiffness .... Fractions of a mm stand between a stiff spot and a glaring hinge.