Layering Siyah

Can you explain your question further? I think you are not talking about layers of sinew, right? Is it the question of whether the splice between the siyah and the limb is vertical or horizontal to the plane of the limbs?

Stephan i'm talking about siyah wood.when you don't have a naturally bend wood for siyah you should use some thin strip of wood and glue tem on a form for your siyah.
sorry that i can't explain it in my last post.

I think it is meant like the ones in the picture, only with better glue lines. These are a poor example for glueing.

Daniel

Thank you Daniel for the picture.
but what kind of wood and what kind of glue is it?

The white one is cherry sapwood, the other is yew. The glue is epoxy. As I said, bad example ;)

Thank you.here i just can find 5 min epoxy which is not good for this.

Just use shahtoot and hide glue,that is what was used traditionaly.

Did they use this method in old days too?

I believe that you glue several flat sheets of wood together, the more thinner layers the stronger , to the desired thickness of the sahiya, then draw the shape of the sahiya on the top piece and cut out with a jigsaw. The same as if you where cutting the sahiya out of a piece of plywood. (It is like making your own plywood.) This way achieves maximum strength for minimum width and no bending is required.

hcspng - The photo below shows how I do it... at least 3 pieces of wood, with the grains running in different directions. Cut out the shape of the siyah several times and then glue the pieces together to make a pair. I use woods from 3mm to 8mm thick. The woods in the photo are Cherry for the center and Mango (because it's pretty) for the outside pieces. The cherry was about 7mm thick and the mango pieces about 3mm thick.


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As you can see below I reduced the length of the siyahs before gluing them in place.

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Multiple thin laminations make a stronger piece, but at the cost of increased weight. Heavy siyahs can be a problem with bows by affecting the shooter's comfort and the performance of the bow.

Is it possible to use light woods like pine?
KenH you use hideglue or epoxy?

Go out for naturally grown siyahs, it?s really not hard to find. Almost every tree or even a brush offers the shape you want.
Laminating is a waste of time and energy and you end up with a smaller performance.
Michael

yep :wink:

redhawl i know but i can't find a good naturaly bend in wood and if i find cutting is fobidden even have jail :shock:

hcspng - I used Titebond II; I don't know if you can get that in Iran. Long setting epoxy would also work.

I can't just go out and find some elbows and cut them either, here in Florida, USA. I'm happy for you Redhawk and Uli. But not everyone can just go out and chop down the woods. Making laminated siyahs is certainly a viable option. And FYI my laminated siyahs are lighter than the solid wood siyahs on my Grozer that was destroyed by accident.

hcspng, why you dont think about steaming and curving solid piece of wood ???

Thanks for your helps.KenH the only glue which i can find here is titbond II and it have igh price here but i've to test it.
Dusan i have little experiment with steam and i just use boiling.could you please give me some information about it!

• hcspng, I tried both methods - syiah laminated, and steam bending syiah. Dusan is right - steam bending (last photo) is faster, easier and cheaper. . also hope this fall to find a suitable tree with natural curves. I wish you success!

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Pazuzu, those are very nice looking siyas, the string notch appears to be on the wrong side ? or is that notch for some other reason?

Hpscng, Titebond ll is good wood glue it will do the job.

dragonman, this is not string notch, a groove for a rope for tying in the form yay halkası :D

Pazuzu, I never saw that before. Will you remove them when the bow is finnished?? What is yay halkasi???

Thanks for your comments and pics but how much thick was your siyah? and do you cut it to final dimension and then steam bend it?
how much time is required?
i've just steam bend a piece of walnut which was 3 mm thick :D and it was very easy!

dragonman, for yay halkası (bow ring) see the video dr.Aksoy http://www.youtube.com/watch?v=O9xgiX5-PGg
hcspng, I steam bend 4 lams, 5 mm. thick. - Total 20mm (Acer campestre). also without a problem curve 18- 20mm. thick (Аcer tataricum). but my interests are almost entirely the ottoman bows. I do not know how extreme is the curve you want to bend. what is your bow? yes... 3 mm. really bent easily :D

I'm plannig to build a turkish and a persian.