ATARNarchive

5 piece construction

10 posts2010live thread
hcspng
I want to know is there any ratio for 5 piece core?for example grip(10cm)=1,sal(30cm)=3 and siyah(25cm)=2.5?
I hope you know whhat i mean :)
Bede
What kind of bow are you interested in. They are different.
hcspng
Bede Persian or Turkish!
As Adam wrote in his book siyah come down to kasan eye and i want to know does the siyah bend in kasan eye?
Bede
I think Adam said that it does, but I am far away from the book.
Adam Karpowicz
I understand the questions is whether the stiff kasan continues through the curved section or not. One extreme are the Indian bows, as in the crab bow, where the bend is completely rigid. Here the "kasan eye" is not positioned at the bend, but past the bend, closer to grip. In most Turkish bows the shorter, rigid kasan ends before the bend, so the kasan eye is at the apex of the bend or before it. When the kasan is short like that, then the bows flex through the bend. Tatar bows are mostly rigid at the bend, the Persian bows I have seen the kasan is shorter and the bent section flexes.

Adam
hcspng
Thank for your answers.Adam i'm making a 5 piece core:handle is 12in.
sal is 30cm.siyah is 30cm.and if i get extract 10cm for gluing it's:
handle 10cm(4in) and non gluing part of each sal is 10cm and 20cm for siyah.does the bend happen in 10cm of siyah? :shock:
and i continue the siyah to kasan eye.
here is my form:
[external image]
Adam Karpowicz
If you mean 10cm of siyah = 10cm of kasan at the tip end, then no, the section of kasan so close to tip does not bend.

Adam
hcspng
Adam here is what i mean:
red lines are glue lines and black one is where i mean.
Adam Karpowicz
The 5-piece construction had the splices between the tip and kasan, not between the kasan and sal. It could be sometimes that was done, but was not common.

BTW, the bent at the kasan/tip in your core should be done over a smaller radius (the angle is OK). This helps later in tillering. For the 5-piece core, it is the easiest to find a bent branch for that.

Adam
hcspng
Thank you very much Adam.