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Author Topic: Update on (Lam bow)  (Read 2233 times)

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Offline bow101

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Update on (Lam bow)
« on: January 15, 2014, 01:40:07 pm »
In the process of building a bi-lam bow.  Have to now glue on a fade section.  How long should I make it.....? I was thinking 16" with a very gradual transition.   :-\
« Last Edit: January 23, 2014, 08:43:20 pm by bow101 »
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Offline Del the cat

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    • Derek Hutchison Native Wood Self Bows
Re: Lam bow
« Reply #1 on: January 15, 2014, 01:46:09 pm »
No my bag, but that sounds like a lot of wasted limb to me. I'd have thought 4" gpip + 2" of fade either side equals 8"
Even if you want to make it a bit more symetrical you could go 4" grip, a couple of inches above the arrow pass and 2" either end for fades. which would be say 10".
I'm struggling to think what you need 16" in the middle of a bow for ... maybe writing shopping lists on it? >:D
Del
« Last Edit: January 15, 2014, 06:14:08 pm by Del the cat »
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Offline bubby

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Re: Lam bow
« Reply #2 on: January 15, 2014, 03:29:57 pm »
4" grip 2"-3" fades, that's ten inches max, and you might want a power lam, how thick is the main bow that is glued up
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Offline bow101

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Re: Lam bow
« Reply #3 on: January 15, 2014, 04:38:34 pm »
Quote from: bubby on January 15, 2014, 03:29:57 pm
4" grip 2"-3" fades, that's ten inches max, and you might want a power lam, how thick is the main bow that is glued up

Its maple roughly over 7/16"  X  1 1/2" wide, hope to end up with 66 NTN. 
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Offline bubby

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Re: Lam bow
« Reply #4 on: January 15, 2014, 08:44:03 pm »
use a powerlam, make it several inches longer on each fade, if the riser is 10 go 14 on the powerlam
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failure is an option, everyone fails, it's how you handle it that matters.
The few the proud the 27🏹

Offline bow101

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Re: Lam bow
« Reply #5 on: January 15, 2014, 09:50:22 pm »
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Don't think I'll use a power Lam because I already done the tapering and some floor tillering, have to get it bending more in the right places.  This one may come in slightly under weight,  I wanna hit about 45#


« Last Edit: January 23, 2014, 08:58:20 pm by bow101 »
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Offline bow101

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Re: Update on (Lam bow)
« Reply #6 on: January 23, 2014, 08:58:34 pm »
 
At any rate I'm almost complete on this Maple MBM 2 lam bow.  1 1/2" @  fades 3/8" at the tips....
Its 66" NTN hit my target weight 47# @27" .    Now here is the dilema I over tillered the top limb, ended up with a hinge it was to late.  So I did a repair on the belly, not thinking should of done it on the Back and glued in some reflex seeing that it took some set after hinging. 
So today I sanded it and added a small piece of yew to the handle back.   It has 1" of positive tiller.  I did a mirror shot and the tiller looks really good and it looks ok on the tree.  No Twist at all and feels good in the hand.

I was thinking of maybe gluing on a proper lam chunk to the back where it hinged and scrape off the ugly part I glued on the belly.  The hinge is about 8" back from the nock.   Have 12 hours of work into it...
I will shoot it in tomorrow and see what it's like then.............   :-\

 
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Offline adb

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Re: Update on (Lam bow)
« Reply #7 on: January 24, 2014, 09:50:22 am »
A hinge is a mistake in tillering. You've made a mistake... learn from it, and work hard to not repeat it. A bow with a severe hinge belongs on the junk pile, and the next one you make without a hinge does not!  ;)
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