Built my BBI form..didn't work

Started by Zradix, May 09, 2013, 10:29:00 PM

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Zradix

Hey guys       :wavey:      

Hope your projects are going well tonight.

While I'm waiting for my boo and Ipe to arrive, I decided to put together a form for my BBI.

I'm worried it might be too curvy.
Right now I just have a pc of 3/16" pine that I shaped to the same outline I plan on using for the bow in the form.

I've never even touched Ipe before so I really have no idea how much it can bend.
Also a little worried about how much bend I can get away with on the bamboo mid limb where it's bending "backwards".

The center post is 4.5".
The mid limb pads are 1.5"
The tip posts are 5"

Looking at the pic now..It does look like things are uneven...It's just because I couldn't get into a postion to shoot the forn straight on.
I assure you ..it is evened up..

..What do you guys think?..Too much to work?
Thanks

   
If some animals are good at hunting and others are suitable for hunting, then the Gods must clearly smile on hunting.~Aristotle

..there's more fun in hunting with the handicap of the bow than there is in hunting with the sureness of the gun.~ F.Bear


Zradix

so maybe I should just shorten the center post an inch or two.
And possibly raise the tips
I've always liked the feel of more grip forward bows.
That's why I put such a high center post in.
I just have no idea how much spring back I'll get.

I was thinking the middle would spring back more than the tips because of it being thicker...I guess just the opposite is true..go figure..lol

I'll be redoing it soon...

Thanks Scott
If some animals are good at hunting and others are suitable for hunting, then the Gods must clearly smile on hunting.~Aristotle

..there's more fun in hunting with the handicap of the bow than there is in hunting with the sureness of the gun.~ F.Bear

Zradix

have to admit..
I was a little worried I'd have to brace the thing at 9" or something to keep the string off mid limb.

...yeah..It's gonna get gutted..
lol
If some animals are good at hunting and others are suitable for hunting, then the Gods must clearly smile on hunting.~Aristotle

..there's more fun in hunting with the handicap of the bow than there is in hunting with the sureness of the gun.~ F.Bear

Roy from Pa

Center post 3 3/4
Mid limb posts 2 3/4
Tip posts 6

Echatham

its already been said, but my next one will look something like yours, but with the center post about 2" shorter.... actually i will probably just follow Roy's dimensions to the letter.

Roy from Pa


LittleBen

Zradix, if you bring the centerpost down 2" you'll be within 1/4" of roy's rocommendation. That's probably the way to go.

Wood bows will get plenty of reflex through set which occurs during tillering and shooting ...

Roy from Pa

Wood bows will get plenty of reflex through set which occurs during tillering and shooting ...

Oh really? LOL come on Ben..

Zradix

Just did exactly that Ben....
Puts me very close to you and Roy.
Thanks for confirming my thoughts.

2.5" center
1.5" mids
5" tips

Looks much more reasonable..
If some animals are good at hunting and others are suitable for hunting, then the Gods must clearly smile on hunting.~Aristotle

..there's more fun in hunting with the handicap of the bow than there is in hunting with the sureness of the gun.~ F.Bear

Roy from Pa


Echatham


Zradix

:saywhat:  

As I NEED a bow right now I'll build it on the form as is.

If it goes smoothly and I think it'll go further, I'd like to try raising the center about .75-1" and the tips 1" on the next one.     :rolleyes:  

...maybe a boo back with a lighter core wood and an ipe belly so I can use thinner strips and get some more bend out of it ...

They call me Mr. never satisfied..well everyone but my Wife..lol
If some animals are good at hunting and others are suitable for hunting, then the Gods must clearly smile on hunting.~Aristotle

..there's more fun in hunting with the handicap of the bow than there is in hunting with the sureness of the gun.~ F.Bear

Roy from Pa

I kin just imagine what she calls you...   :laughing:    :nono:

Zradix

I bet you can Roy...I bet you can..lol
If some animals are good at hunting and others are suitable for hunting, then the Gods must clearly smile on hunting.~Aristotle

..there's more fun in hunting with the handicap of the bow than there is in hunting with the sureness of the gun.~ F.Bear

Echatham

if she's anything like my wife she's probably saying stuff like " you already have a bow, why do you need to build another one? i don't understand why you need all these bows" and im all like... I don't know why you need all them shoes...

Zradix

...LOL..

Nah..She's great about this stuff..as long as I use MY $$$ not OUR $$$.

Actually she thinks I'm a little crazy for selling my one bow..just to afford taking a chance on making one.
If some animals are good at hunting and others are suitable for hunting, then the Gods must clearly smile on hunting.~Aristotle

..there's more fun in hunting with the handicap of the bow than there is in hunting with the sureness of the gun.~ F.Bear

Echatham

ya you are a little crazy for doin that

Zradix

NAH..
When you know what ya want you just know....
..I just hope I'm not wrong..lol

Just got a call from Matt.
The wood is going to the PO today!        :bigsmyl:      

Should have it early/mid next week.
Just Ohio to Michigan...could drive there and back in a day.
Sure is a good guy. Thanks for telling me about him Eric.

The Ipe is going to be 3/4" thick.
I'm getting another pc of boo and 2 PL's also.
Have a couple riser options coming too.
And some horn..

Going to have enough for 2 bows...        :rolleyes:      

Going to have a hard decision on whether to use an Osage or a walnut PL...hhhmmm

I'm kinda scared of ripping that Ipe board in half.
The saw I'm able to use has an 1/8" kerf.
So that leaves me with 2- 5/16" boards.
I see most guys use 3/8" but it seems they all scrape them down to 3/16" or so.

What do you guys think..?
For a 66" tip to tip bow trying to be 45-50# @28"
Is a 5/16" board thick enough?
If some animals are good at hunting and others are suitable for hunting, then the Gods must clearly smile on hunting.~Aristotle

..there's more fun in hunting with the handicap of the bow than there is in hunting with the sureness of the gun.~ F.Bear

Echatham

methinks it will be fine... the ipe is thinner than that on the working portion of my limbs.

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