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R/D Tiller Help: Limb Twist (side bend)

Started by bvalentine002, February 05, 2008, 12:56:00 PM

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bvalentine002

Ok...need help...difficult to admit as a typical man...

I glued up and shaped a R/D longbow: Leopard wood and zebrawood with a cedar core under clear glass.
Looks nice.

I got shallow string groves cut and a short string on it. Bends nice, except one limb looks like it is being pulled to the side by almost an inch. The limb isn't twisting, it's just pulled sideways.

I realize this would be easier with pictures, but I'll try to describe:
With the belly side up and sighting down the string, It looks like the limb tip is being pulled 1" left of where it should be and is therefore not in line with the center of the riser ot other limb tip.

In this view what side of the limb should I sand?

I want to fix this before I finish the string groves (which are all of even depth, btw.).

I had this problem on anther bow and I fixed it, but I can't remember how...

Suggestions?
Brett

brent d.

brett if you have a set of calipers you could graduate the length of the limb and compare each side of the limb in thickness. I did this last night
on a reflexed hickory bow that had gotten a little uneven in thickness. I just mark the high side
as long as it is high and go back and take off wood there. just an idea. it worked for me and it bends a lot better now.
TGMM Brotherhood of the Bow

bvalentine002

Brent,
I'm not sure I understand...

Are you referring to thickness belly to back or from each edge of the limb to the centerline?

This bow is glass back and belly with all parallel laminations. So, belly to back doesn't vary.

More Thoughts?
Brett

brent d.

Brett,
I was thinking all wood bow and scraping the belly.
I havent done a fiberglass bow before. good luck!
TGMM Brotherhood of the Bow

BMN

Here is a picture I found that may help. I'm not sure where I found it but I thought it may come in handy one day.

Bill

Compton Traditional Bowhunters
Professional Bowhunters Society
Prairie Traditional Archers
TGMM Family of the Bow

The most frightening thing you are likely to encounter in nature is yourself.

Holm-Made

That picture is worth a thousand words right there.  Chad

Crooked Stic

An inch is a lot? Is the bow straight when unstrung?
High on Archery.

yamapup

That is a great diagram. I wish that I had had that when I was making lam bows.-Thanks

bvalentine002

Thanks for the photo.

The limbs are completely in line when unstrung...

The R/D shape makes the limbs nearly straight from riser to tip (side profile) when braced.
Thanks,
Brett


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