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Author Topic: Longbow Build  (Read 6544 times)

Offline Todd_ID

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Re: Longbow Build
« Reply #15 on: July 20, 2011, 06:51:20 AM »
The limb tips are 2 layers of phenolic glued on with Goat Tuff glue, trimmed down with scroll saw, shaped with belt sander, and finally string groove filed in with a chainsaw file.  The first time I did the grooves I had the angle wrong, and the string wouldn't stay in the groove on the sides of the limbs.  I angled it down some, and now it works fine.

Bring a GPS!  It's awkward to have to eat your buddies!

Offline jackmaster

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Re: Longbow Build
« Reply #16 on: July 20, 2011, 06:59:13 AM »
that looks great, looks like an awesome project for the winter, if you dont mind me asking can anyone by the materials from the guy you used and if so does he also have the stuff to build crossbows, i have always wanted to build a crossbow. thanks for any info
my grandpa always said "if it aint broke dont fix it"

Offline Todd_ID

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Re: Longbow Build
« Reply #17 on: July 20, 2011, 06:59:59 AM »
Here's a pictorial example of how I messed up the string groove angle on the sides of the limb and how I changed it to make it work.




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Offline Todd_ID

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Re: Longbow Build
« Reply #18 on: July 20, 2011, 07:01:54 AM »
that looks great, looks like an awesome project for the winter, if you dont mind me asking can anyone by the materials from the guy you used and if so does he also have the stuff to build crossbows, i have always wanted to build a crossbow. thanks for any info
I think the answer to both would be no.  I just bent his ear in a moment of weakness and he agreed to help me out.
Bring a GPS!  It's awkward to have to eat your buddies!

Offline Todd_ID

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Re: Longbow Build
« Reply #19 on: July 20, 2011, 07:46:51 AM »
Just shot some different arrows over my chronograph to see how it did.

282 grain carbon 218 fps
422 grain carbon 196 fps
545 grain cedar   182 fps
591 grain carbon 176 fps

If I'm not mistaken those numbers are just about better than my first compound.




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Offline ribka

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Re: Longbow Build
« Reply #20 on: July 20, 2011, 07:49:54 AM »
Those speeds are very impressive!


Offline staveshaver

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Re: Longbow Build
« Reply #21 on: July 21, 2011, 07:49:06 AM »
Hey Todd, that thing turned out really good, I'm impressed :tup: I sure would like to see some profile pict's at full draw....did any of those cedars that I sent seem to work for you?  I would guess that the light colored one with the trad. barrred cock feather should work real well...I think it is about a 70-72lb spine and prolly weighs about 350gr.

Just got the part for my band saw yesterday, so I'll be back in business building bows again. I have lams and risers ready for a pair of 60 lb T/D,-LB's....just need a little time to get em started.

Good luck, hope to see you hunting with that bow in Sept.

Tom
One arrow makes a group >>>---------------->

Offline Todd_ID

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Re: Longbow Build
« Reply #22 on: July 21, 2011, 09:33:34 AM »
I couldn't seem to get any of the cedars to fly too well.  I'll try again with them today.
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Offline Todd_ID

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Re: Longbow Build
« Reply #23 on: July 21, 2011, 10:46:54 AM »
OK, found 2 cedars that I liked.  74# with 160 grain head and probably a 70# with 145 grain head.  Here's a picture of the drawn profile.



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Offline staveshaver

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Re: Longbow Build
« Reply #24 on: July 22, 2011, 03:00:17 AM »
Ok Todd, the top limb is a little flat at mid limb.  I would first get that bending a bit more to match the bottom limb.  That will prolly get your tiller close....if it is still not 3/16 positive tiller after you get that flat spot out, then sand the entire top limb a little bit at a time till you get it spot on....be careful not to go too fast...sand a bit then exercise the limbs a bunch before taking any more.  Good luck bro.
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Offline staveshaver

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Re: Longbow Build
« Reply #25 on: July 22, 2011, 03:05:43 AM »
Oh ya, I forgot...when you get the bow right and start tuning those cedars....try the cock feather in instead of out...that will give you a feather at 12:00, works real well with most bows.  Don't forget to get your wood grain turned properly before gluing on you nocks...
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Offline rasbo

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Re: Longbow Build
« Reply #26 on: July 22, 2011, 03:36:36 AM »
very nice work there

Offline Todd_ID

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Re: Longbow Build
« Reply #27 on: July 22, 2011, 10:41:31 AM »
So I wasn't as satisfied with the final output as I wanted.  The tiller was a bit off, and the top limb wasn't bending like it should.  All my fault, so I came up with a solution.  I switched positions of the top and bottom limbs.  The writing is upside down now, and I need to reshape the limb to riser interface, but the tiller came out at 3/16" positive.  And, most importantly, it shoots WAY better now.  Thanks to staveshaver's texts with advice of the problems and agreeing with the solution!

Here's the picture of the drawn profile with the limbs switched:

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Offline pianoman9701

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Re: Longbow Build
« Reply #28 on: July 22, 2011, 11:16:26 AM »
Nice job, what a beautiful thing to have made yourself.
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Offline staveshaver

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Re: Longbow Build
« Reply #29 on: July 22, 2011, 02:14:54 PM »
That looks allot better....I'd be happy with that....
One arrow makes a group >>>---------------->

 


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