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My horn bow build-a-long

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bownarra:
Here are the measurements from my 40ish# bow. 121cm.
Center - 33mm
5cm  - 26mm
10cm - 14mm
15cm  - 10.4mm
20cm - 9.6mm
25cm - 9.1mm
30cm - 8.9mm
Kasan eye 35cm - 9.5mm
40cm - 12mm
45cm - 13.5mm
50cm - 14.5mm
Base of tip 52cm - 17mm

bownarra:
It's a fast bow :)
I'll take some pictures this afternoon of it unbraced and braced. So you've got something to aim at.

As for bending just before sinewing yes you can do it and it is useful but you must bend the bow backwards, bending it the correct way any appreciable distance will of course break the core at one of the many grain violations ;)
Of course bending it backwards needs an eye for what the correct shape of a sinewed bow is when it is tied up for seasoning.....on this first bow just make absolutely certain you have a perfect taper with not even a hint of a thin spot anywhere and you won't be far wrong.

DC:
Thanks bownarra, especially for the measurements. Something that's been puzzling me. Is it the total thickness of the limb that determines the DW(ignore length and width for this) or does the percentage of each layer have some effect. Would a bow that is 10mm thick have the same DW whether it was 1/3,1/3,1/3 or maybe 1/4,1/4,1/2. Within reason of course :). Adam suggests adding extra sinew on your first bow, isn't that going to increase the DW?

DC:

--- Quote from: bownarra on October 07, 2019, 08:27:15 am ---Here are the measurements from my 40ish# bow. 121cm.
Center - 33mm
5cm  - 26mm
10cm - 14mm
15cm  - 10.4mm
20cm - 9.6mm
25cm - 9.1mm
30cm - 8.9mm
Kasan eye 35cm - 9.5mm
40cm - 12mm
45cm - 13.5mm
50cm - 14.5mm
Base of tip 52cm - 17mm

--- End quote ---
How much of that is sinew do you think? Rough width of limb? It's very similar to mine in general measurements but my eye is at 30ish.

DC:
Today I'm organising my sinewing setup. Building a rack to hold the bow, calibrating my hotpot. Figuring out what length and how much sinew to put on the first coat. That kind of stuff. With any luck I'll do the final thickness sizing of the bow this afternoon and then maybe a couple of coats of glue sizing.

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