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Main Boards => The Bowyer's Bench => Topic started by: Apex Predator on April 25, 2009, 09:37:00 AM

Title: Designing my first three piece take-down.
Post by: Apex Predator on April 25, 2009, 09:37:00 AM

I'm ready to play with a three piece takedown longbow. I want a reverse riser and a an R/D profile. I'm thinking 62-66" NTN. The first one will be 66".

1. I'm designing it around a 1.5" width limb and riser.

2. What are the dis-advantages of only one alignment pin?

4. How thick should my limb pad wedges be in my limb? How long of a taper?

Title: Re: Designing my first three piece take-down.
Post by: Apex Predator on April 25, 2009, 09:38:00 AM

I took a photo of my sketch for you guys.

I would prefer to have the limb wedge on the back of the limbs like in the sketch, with the bevel on the riser ends mating with the taper on the limb wedges. I'm thinking about a 1/8" of phenolic on the belly of the limb butts, so that I can counter-sink the bolts. The riser limb pads will be flat in the final bow. I think it would be too ambitious to try and make them curved, even though that would really look sweet. The final design may not have this much R/D.

What are your thoughts?

 (http://i121.photobucket.com/albums/o203/Apex-Predator/Bow%20Building/Takedowndesign.jpg)

Title: Re: Designing my first three piece take-down.
Post by: Tom I. on April 25, 2009, 11:15:00 AM

Marty,
Bow design is about 6 levels above my pay grade...but...I'm looking at your riser length and wondering if the sight window is gonna cause you to have to narrow the top limb butt too much??
Tom I.

Title: Re: Designing my first three piece take-down.
Post by: bjansen on April 25, 2009, 11:18:00 AM

Well Apex, that looks outstanding...I cannot wait to see this one. When i make a TD that long I use a 10" long limb pad and make it about 1/2 thick.  But I would say anywhere between 8-10 would work.    I made this little jig below to grind them:

Are you going to use the Bingham T/D limb bolts?..just wondering if you knew of a source to get flat ones like on a Black Widow (rather than the bezel style Bingham's carries.

 (http://i492.photobucket.com/albums/rr287/bjjanse/shanes%20recurve/Bowerpics163.jpg)

Title: Re: Designing my first three piece take-down.
Post by: Apex Predator on April 25, 2009, 12:26:00 PM

Excellent point Tom!  I will refine everything after I build a mock up riser out of soft pine.

I am going to order Bingham's hardware kit.  I think I will build up the belly side of the limb butts with phenolic accents, which will cover the alignment pin hole I plan on drilling through the limb, and give me enough material to counter sink the limb bolt heads.  My plans may change though.

Title: Re: Designing my first three piece take-down.
Post by: bjansen on April 25, 2009, 01:03:00 PM

Thats a great idea...and an excellent sketch...I never would have thought of such a nice design...

Title: Re: Designing my first three piece take-down.
Post by: Apex Predator on April 25, 2009, 01:12:00 PM

Brad, I wanted something different.  I love the forward riser take-down design.  There aren't that many being made.

Title: Re: Designing my first three piece take-down.
Post by: kennym on April 25, 2009, 03:23:00 PM

Hey Marty,

I like it!!  :thumbsup:  

I'm not much of a TD guy,but can you give it any more reflex for preload? That would be my only change were I doin it,and I'm not even sure I'd do that.

Title: Re: Designing my first three piece take-down.
Post by: Apex Predator on April 25, 2009, 04:17:00 PM

What is so cool Kenny, is that I can make it any way I want it.   :)   I will play with some dummy parts until I have what looks good to me.  I'll keep you guys posted.

Title: Re: Designing my first three piece take-down.
Post by: Arrowslinger on April 25, 2009, 04:52:00 PM

Looking good Marty.  I made my first three piece TD recurve about two months ago.  Can't wait to see it.  You are right Marty that is what I like about making my own I get to decide what I like.  Right now I am working on a R/D longbow with the socket style takedown.

Title: Re: Designing my first three piece take-down.
Post by: Lewis Brookshire III on April 25, 2009, 06:45:00 PM

That is going to be one sweet looking longbow, but I would agree with Kenny on putting more reflex in those limbs.

Title: Re: Designing my first three piece take-down.
Post by: ron w on April 25, 2009, 07:36:00 PM

Marty, I thought you were going to go 2 piece? This design looks really great, but what changed your mind. Just wondering.

Title: Re: Designing my first three piece take-down.
Post by: Dmaxshawn on April 25, 2009, 10:09:00 PM

that looks real nice Marty.  I like to see more of in person when you get one ready.

Shawn

Title: Re: Designing my first three piece take-down.
Post by: TNstickn on April 25, 2009, 10:25:00 PM

Very cool Marty!!

Title: Re: Designing my first three piece take-down.
Post by: BenBow on April 25, 2009, 11:36:00 PM

Agree with more reflex with that design. Here's one I did for my grandson. But this is a bit too radical. So somewhere in between ought to work well.
   (http://i122.photobucket.com/albums/o241/galnmax/bow1-1.jpg)

Title: Re: Designing my first three piece take-down.
Post by: LC on April 26, 2009, 01:01:00 PM

Man I love that design!

Title: Re: Designing my first three piece take-down.
Post by: phatty363 on April 26, 2009, 02:27:00 PM

thats looks really good bro

Title: Re: Designing my first three piece take-down.
Post by: Apex Predator on April 26, 2009, 06:57:00 PM

I haven't shelved the two piece, but this one came to me in my "day dreams".

Don't get too caught up in the sketch, because it is mainly just to get the riser from my mind on to paper.  I'm looking for 1" net reflex, which is slightly more than what the drawing shows.

Title: Re: Designing my first three piece take-down.
Post by: ron w on April 26, 2009, 07:07:00 PM

Well with your track record I'm betting no matter what you decide on it'll be good.

Title: Re: Designing my first three piece take-down.
Post by: kennym on April 26, 2009, 09:35:00 PM

I kinda figured that after I posted Marty. I'm sure it will be a goodun!!

Title: Re: Designing my first three piece take-down.
Post by: razorsharptokill on April 27, 2009, 11:00:00 AM

I like it! I've also thought about that design style. Looks like it will be a good performer!!

Title: Re: Designing my first three piece take-down.
Post by: tommy6 on May 04, 2009, 10:37:00 AM

Nice looking bow plan. Have you taken a look at how Fedora does his limb bolts? He seems to countersink them and uses 2 pins. Looks real clean when set up. What angle are you planning to cut for the riser's limb pads?