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My horn bow build-a-long
gorazd:
I made a shortcut to avoid bending thick wood.
I made a form for turkish siyahs then glued 4 thinner strips (4mm thick) in form to match exact turkish look...
--- Quote from: DC on July 01, 2019, 10:20:17 am ---Here's a picture of the caul I'm planning to bend my limbs around. I'll do a couple of test bends to see if I like the shape. I can do that while I'm waiting for the limbs to soak for a week!! That seems like a long soak but I guess it can't hurt. I've only got the two perfect? limb laths. No sense taking a chance.
--- End quote ---
DC:
Thank you for joining in. I was thinking that no one was reading this. I wondered about laminating after my first try at bending a piece of Hazel as a test. I got quite a bit of spring back. I hadn't soaked it for a week or dried it for a week but still. It would save me building a trough to boil it in. It would also save me a month in drying. Did you use epoxy or hide glue?
gorazd:
I did laminating turkish siyahs with hide glue ...
I glued 4mm thick pieces of black locust. But before gluing - I did dry heat bending of the pieces to get some bends of the form - I heated with heat gun and fixed the laths (with the clamps) in the form , one by one...
And left in the form for one day - I guess that with thinner laths (3mm ) it should go without prebending. But I did it to avoid too much stress with glue line and risk of cracking wood...
When gluing - I precoated the wood couple of times with thin hide glue and finnaly with one thick (hot) hide glue - messy proces - when you join 4 pieces they get pretty slippery and some help is needed to fix them with clamps...
I did one pair of siyahs for mongol bow with epoxy glue too.... these still wait for next project (f)
Of course epoxy gluing is much much faster - I thickened the laminating resin with microbalons...
But regarding the strength - hide glue is very strong - I joined two pieces of black locust with just one thick hot hide glue layer and couple of weeks later later I hammer tested the joint.
No way to crack the glue joint - wood gave in - black locust tear out.
Obviously black locust is compatible with hide glue...
--- Quote from: DC on July 02, 2019, 12:32:44 pm ---Thank you for joining in. I was thinking that no one was reading this. I wondered about laminating after my first try at bending a piece of Hazel as a test. I got quite a bit of spring back. I hadn't soaked it for a week or dried it for a week but still. It would save me building a trough to boil it in. It would also save me a month in drying. Did you use epoxy or hide glue?
--- End quote ---
DC:
So you're doing 5 piece construction? I have my Douglas Maple all cut out for complete limbs(3 piece). I may just continue that to keep with the traditional way but at the same time I think I'll follow your lead and epoxy up some Eastern Maple strips into siyahs as backup in case the bending goes bad. I'm curious to see if the soaking/boiling method will produce a limb with little or no springback.
DC:
Oh, when you say you are gluing up the siyahs with 4mm lams how much of the bow are you making? Will your siyahs include the tips and the entire kasan or will it just be the tip and the outer half of the kasan. Put another way will you have a slice in the middle of the kasan? Sorry for all the questions. :D
Nevermind I just found it in Adams book on a 5 piece the splice is in the kasan.
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