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Violated growth rings

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Bjoern Sofeit:
Look at it like in this pic. Here the grain runs off in the end, that wouldn't be ok if it was in mid sal.

mikekeswick:

--- Quote from: loon on July 01, 2017, 01:32:04 am ---
--- Quote from: Bjoern Sofeit on June 30, 2017, 01:39:43 pm ---Growth rings can be violated and will be violated. What you want to look at is the grain that runs along the side. Should be nice and straight. If it runs off wildly, you'll have a broken bow or a super warped piece of junk when the sinew is on.

--- End quote ---
so you mean, the grain should all be parallel to the bow, and it shouldn't run off? and it doesn't matter if it runs off in the back or belly?

you're not talking about how the grain looks on the sides of the core, right, but how it looks on the back?

--- End quote ---

It is simple really :)
Start off with perfect wood. Then make the bow.

Tom Dulaney:

Hey guys I really appreciate the help, as always. I'm not always around so I don't get to sign in to thank you for your contributions.




--- Quote from: Bjoern Sofeit on July 01, 2017, 02:14:39 am ---Look at it like in this pic. Here the grain runs off in the end, that wouldn't be ok if it was in mid sal.



--- End quote ---


Thanks for the picture!  This only matters if it's on the back, right? You can have some runout on the belly? Open question for all, cuz I don't expect a quick answer from just one person. We gotta go to work!!!

Bjoern Sofeit:
That's a hard question, maybe it's possible to take a pic of the grain? Ideally you'd want to avoid runoff in the belly or back. Either the core breaks, or the horn delaminates with parts of the limb. In the mid of the limb it's a complete dealbreaker, in the fades or near the grip, you might get away with it if it's a little runoff. Runoff & sinew *always* means twists.

A friend tried to cut out siyahs of a bigger maple slab for a lightwight mongol conquest bow, and although it was covered with quite a bit sinew, the whole thing unsurprisingly literally exploded.

mikekeswick:
Iffy grain just isn't going to handle being bent into the correct shape in the first place (Turkish bow). For other styles that don't need an exaggerated steam bent core then I totally agree with Bjoern. It simply isn't worth all the time and effort to use dodgy wood. The answer is simple really go out into the woods and look for perfectly straight saplings with no flaws.
Making a hornbow and waiting 6+ moths for it to dry only for the core to break is no fun at all.

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