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Ironbark mollegabet from downunder
Hamish:
That is a lot of weight to drop, with no apparent cause. Has it taken a lot more set than in the previous unstrung photos?
Are there any chrysals/compression fractures near the hinge(and or localized set). Moisture can cause a drop in weight, increase in set, but 17lbs is a heck of a big drop.
A pair of outside calipers can go a long way in helping to prevent a hinge. Checking the thickness taper whilst tillering makes sure you will pick up any thin spot before it's too late.
I have made stave bows from grey ironbark, sapwood limbs and heartwood on the handle, and also bamboo backed bows from heartwood. It usually makes a good bow, but sometimes frets even when the tiller is good.
willie:
--- Quote from: ozy clint on April 25, 2025, 09:32:01 pm ---Would high humidity cause such dramatic weight loss? It's been drizzly weather here the last few days.
--- End quote ---
all of what Hamish mentioned above and I quess one other thing to suspect is if you you might have been making adjustments too quickly and without letting the adjustments settle in before further tweaking. Working slowly as you approach full tiller is prudent.
Some folks like to shoot the bow at reduced draw lengths before drawing it out further. A couple of times.
I know I can see one thing at the end of a tillering session, and see the limbs bend in a different way when I string it up again tomorrow.
Aussie Yeoman:
--- Quote from: ozy clint on April 25, 2025, 09:29:51 pm ---
--- Quote from: Aussie Yeoman on April 25, 2025, 01:44:23 am ---I think Ironbark is my favourite of the Aussie hardwoods. I use it more than any other. The heartwood to sapwood contrast is really striking.
Great job, especially for a second bow!
--- End quote ---
Do you find the sapwood is ok for bows or should it be removed from the stave first?
--- End quote ---
Sapwood is great. No need to remove it.
ozy clint:
--- Quote from: Aussie Yeoman on April 27, 2025, 09:08:12 am ---
--- Quote from: ozy clint on April 25, 2025, 09:29:51 pm ---
--- Quote from: Aussie Yeoman on April 25, 2025, 01:44:23 am ---I think Ironbark is my favourite of the Aussie hardwoods. I use it more than any other. The heartwood to sapwood contrast is really striking.
Great job, especially for a second bow!
--- End quote ---
Do you find the sapwood is ok for bows or should it be removed from the stave first?
--- End quote ---
Sapwood is great. No need to remove it.
--- End quote ---
What about on Brigalow?
Aussie Yeoman:
I've not used it myself but I understand that to be just fine too.
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