tillering help?

[wood carver 2]

I'm having a bit of trouble getting a kink out of the lower limb of my bow and I thought I'd better ask for some advice. The lower limb, on the left in the picture, was a lot stronger than the upper, so I scraped and sanded and it is evening up some. Now it has that kink around mid limb that I'm having trouble removing.
Any ideas would be appreciated.    
 
Thanks.
Dave.

[Pat B]

Dave will you post a pic of your bow without string pressure so we can see the shape you are starting off with. Makes it easier to guide you to a sucessful tiller.
  What are the components of your limb stack?

[wood carver 2]

Pat, this bow is made up with a 3/16" bamboo back that tapers to 1/8", a 3/16" jatoba power lam 25" long, walnut core lam 3/8" tapering to 1/16" and a flooring bamboo belly 1/8" thick. The bow is 67" long with 65" ntn and 1 1/2" wide at the fades tapering to 3/8". The upper limb is 1" longer than the lower. I'm aiming for about 55# at 28" and it's still quite heavy. I weakened the lower limb by scraping the belly and sides and I can't reduce the belly any farther.
 
In the first picture I posted, it's on a very low brace.
Dave.

[John Scifres]

Keep working it at midlimb on the left ntil it is even with the right and then bend it just a bit farther.  Do it slowly and carefully cause sometime they'll sprin gon you and there will be a hinge where a stiff spot was.  It's also a good idea to confirm the dimensions in odd areas.  Make sure the width and thickness are even with the other limb and tapering uniformly.

[wood carver 2]

Well, I over did it.    That kink in the lower limb became a bad hinge. I strung the bow up using a shorter string and the last 8" or so bent right over and it feels real weak now.
The only thing left to do is salvage the riser and toss the rest into the burn pile.
thanks for your help.
Dave.

[Pat B]

Dave, that bow seems way heavier than the 50# you are shooting for. Have you determined that each component of your stack is not too heavy for the draw weight you are shooting for? With a boo backed/boo belly bow you get very little adjustment from your initial glue up.

[wood carver 2]

I was a bit worried that I had over done this one. I don't have a lot of data on lam thicknesses for different bow weights - just what I have documented from the bows I built that turned out well. I made the back and core a little thicker than I normally would because my last bow came in a few pounds underweight. I guess I over did It. This one's a goner. It didn't crack, but the last 8" just bends right over when it's strung. Even on a longer string.
I'm going to cut out the riser and re-use it. Maybe for an all bamboo bow like on Semo-Hunters' thread.
Thanks for your help.
Dave.