Hi all! Building my first longbow. Wood laminated with slight d/r aiming for the mid thirties pound draw range and maybe 60-62" nock to nock.
So far I have bamboo backing from echo archery that is about 1/8"
Handle will be osage as well.
I have a very thin piece of osage, I was hoping to go just BBO, but will have to add something else I think and figure why not something besides Osage.
Basically I am looking for a recommendation on a piece of lumber that would go well with these two that is about 1/2" x 1.5" x 70" or so.
What about Ipe? and where to find it. Any cheap options out there?
I believe I will be using Unibond 800 for the glue up.
Thanks
It is best to pick a lower density wood for the core. Corers are really only spacers between the back and belly surfaces that are doing the work.
Maple, b.walnut,sycamore or a similar mid density wood woulkd be my choice. B.walnut looks well against osage.
I would put about an 0.002 taper on it. Or if going full pyramid with the limb profile 0.001.
How thick is the piece of Osage you have?
That's what I was wondering, how thick is the osage, and is it already brought to accurate dimensions throughout? Is it parallel or tapered? Is it a GOOD piece, with no knots or severe ring runout?
You might already have what you need for a 30# bow just with the boo and thin osage belly.
The osage I have is coming from OMC bowyer supply.
1.5" wide
.050 thick (inches??)
.002 taper
its 2 36" pieces. What exactly does .05 thick mean?
I ordered rather impulsively. :D
I guess I was hoping for a piece about 3/8" to 1/2" thick to start from.
You could probably build a 60# bow with the 1/2" osage and boo backing.
Well I currently shoot a 40# @26 and I'm very inconsistent when it comes to a 30-60 arrow 3D shoots so I want something lighter to work on my form.
Trying to figure out what .050 thick means. I'd understand if it said 0.05"
0.050" is a thin lamination.
It is 5/100 of an inch thick, or less than 1/16" thick.
I always use all 3 numbers like .050, because I deal in thousandths of an inch to keep it simple.
So fifty thousandths is same as five hundredths.
Right Roy? :D
That's why I added the 1/16".......so Roy could follow along. :biglaugh:
I am a little confused by the numbers you show. A tapered lam usually is represented by the thick end thickness, so in your case 0.050". Then it tapers out at a certain taper rate, in your case 0.002" per inch of length. On a 36" lam with 0.002" taper, it will be 0.072" thinner on the thin side than the thick side. That's not possible if it only started at 0.050".
Or am I missing something?
It would clear things up if you could measure both the thick end and the thin end of one of your lams.
I am also confused by the numbers!
Just got off the phone with OMC bowyer supply and he set me up with a more proper thickness and taper to back with bamboo. Should have it sometime next week.
I think I will use a hacksaw blade to gently score the wood before glueing up to the bamboo with Unibond 800, unless y'all suggest something else
Hacksaw blade scoring and Unibond should work.
Your bamboo should be tapered also. 1/8" thick at the handle and 1/16" at the tips.
What are the dimensions of the osage now going to be?
A 3/8th or .375 thick Osage belly lam will get you into the mid 30#'s with no problem at 60-62" nock to nock. Might even come out more on the 40# + side. But it's always nice to have a little extra wood.
Watch your mouth Kenny.. LOL
When you get to low poundage bows you can't always
use 3 or 4 pieces in a stack.
I have made some with 2 fiberglass and 1 taper lam.
Listen to Roy on a BBO
Dial Calipers
1 revolution = 1/10 of a inch or.100
https://www.google.com/search?q=Dial+calipers&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiSuoS9j6DUAhWDDiwKHTLZBFEQ_AUICygC&biw=1093&bih=510
Yep, listen to Roy. :notworthy:
LOL
Osage is here
Both pieces just over a 1/4" tapering to 1/4"
36" Long
I also got a nice riser block, and am thinking about cutting a power lam from it to go between the bamboo and the 1/4" osage in order to take stress off my handle.
Not much of a taper there, tooch. :knothead:
I assume you mean taper from 1/2" to 1/4"
No i meant what I typed. Not much of a taper at all indeed. On both there is one side just over 1/4" and the other side is right at 1/4"
1/4" thick Osage will be fine for the belly lam. But for a bow in the mid 30 pound range, you want to add a core lam of about 1/16th" to 1/8" thick.