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Old 05-21-2020, 04:26 PM
Glueituk Glueituk is offline
Join Date: May 2020
Posts: 2
Default Tillering problems

Hello all, I am fairly new to bow building and could use a few tips. I am building board bows from various materials , getting hold of good straight grain wood has turned out to be harder than I thought so I use whatever I can get hold of.
My last attempt was a white oak backed with popular 70 ntn. No matter how carfully I tiller the limbs take a set . So to remedy this I made a form to put about 1 of reflex in the last 14 of the limbs. It seemed to be going ok and had got to first bracing height. This showed the string to be off center line so I took some wood off one side of one limb. This looked like it was going to solve the problem if I did the other limb as well, instead I put it on the tiller and it broke. 45 lb @ 20 which was about where it was when I decided to sort the string out. As far as I can tell the center of the break seems to be around the 14 reflex section. You should be able to see the limb in the pics.
My Questions
Am I asking too much of a white oak board ?
Should I have done both limbs at same time when correcting string ?
Bone and horn tip overlays, can they be glued using UF resin wood glue ?
Are there other ways to stop limbs taking a set?
My kind regards and thanks to all.
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Old 05-29-2020, 04:28 AM
barking mad's Avatar
barking mad barking mad is offline
Join Date: Jan 2007
Location: Finland
Posts: 1,981
Default Re: Tillering problems

Being far from expert on wooden bows, I'l throw in my .02c.

Did I understad correctly that you backed the oak board with poplar?

White oak is a tremendously strong wood in compression, while poplar is soft and not really a bow wood I'd use if I'd have other options. The belly overpowered the soft backing and the limb broke in tension, as seen in the pictures.

Hickory and bamboo would be more suitable woods for backing a white oak board. Especially if you're aiming for a reflexed bow. Sometimes one can find large bamboo staves in garden centres.

I've made a couple of board bows backed with rawhide, which is probably the easiest. And while the rawhide backing does not keep any reflex, it does keep bows in one piece.
Those are my principles, and if you don't like them... well, I have others.

-Groucho Marx-
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