Main Discussion Area > Horn Bows
My horn bow build-a-long
DC:
Adam suggests not tillering if the RH is below 30%. Does this suggest that things may go easier if you kept the bow in a controlled environment of 50-60% maybe even 70% for the tillering period?
DC:
Just wondering, this is the bow at rest. Should it be further open? I thought there was mention somewhere that the tips should be 90° to the belly at this stage.
bownarra:
Humidity that low is a dream to me! I wouldn't worry too much about the humidity but yes it is useful to keep it equilibrated at 50 - 60 rh.
The belly cracks can be caused by the sinew drying (it also shrinks laterally)but yours looks like it may have been there all along. Did you put the linen patches on the belly during curing? They do help but a bit late now.
Yes the weak spot id where you have marked.
Yes treat it like a wood bow regarding weak spots. Even material removal on the good limb and either side of the weak spot. It can be helpful to put a piece of paper/card under the bow on the pegboard , bend the bow and trace the outline onto the card. Make corrections then repeat. The card will help you spot the differences between corrections and compare one limb to the other easily.
Be careful with any weak spots as they can cause the core to break.
bownarra:
And yes you should open it out with heat so the tips are pointing straight up when at rest. It's tricky at this point because the bow is still holding reflex,some of which it will lose by being tillered to full draw. Chicken or the egg?
DC:
--- Quote from: bownarra on February 20, 2020, 12:58:34 am ---And yes you should open it out with heat so the tips are pointing straight up when at rest. It's tricky at this point because the bow is still holding reflex,some of which it will lose by being tillered to full draw. Chicken or the egg?
--- End quote ---
OK My plan is to heat it the red marks to 50c. I'm thinking it will make it easier to tiller as I won't have so much reflex, won't have to bend it so far.
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