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ILF limb stack thickness question**2 sets glued up

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ILF limb stack thickness question**2 sets glued up

Postby Robertfishes » Wed Feb 18, 2015 11:11 am

I built my form and wedge jigs, got a couple sets of limb detent assemblies from Lancaster...now i need to glue up my first set of limbs, here's my problem.. Stack height..The only ILF limbs I have access to are SF carbon wood shorts and SF carbon foam longs. I know the double carbon in these limbs makes for a thinner stack, but what about the foam? Is it stiffer than amberboo or maple? I didn't copy the SF limbs i added more hook..for the first build I'll be building longs from fiberglass and wood limbs. I plan on using 040 clear glass, pretty veneers, red elm tapers with 003/in total taper. Shooting for a lower draw weight for the first set, 35@28"..that way I might not end up with 80# limbs.. Anybody have a set of glass and wood limbs they can grab a thickness from, up by tip overlays is OK, I can add 003/in from there. I know it will still be a guess for the first couple of limb sets...Thanks, Robert
Last edited by Robertfishes on Tue Mar 03, 2015 9:38 am, edited 2 times in total.
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Re: ILF limb butt thickness question

Postby Jim Casto Jr » Wed Feb 18, 2015 7:40 pm

Can't answer your question, but I stole these from someone that stole them from someone. Sounds like maybe you're already beyond this.

ILF drawing.jpg
ILF drawing.jpg (36.11 KiB) Viewed 6247 times


ILF drawing a.jpg
ILF drawing a.jpg (20.8 KiB) Viewed 6247 times
"Archery is really very simple. You just have to do the exact same thing on every shot"
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Re: ILF limb butt thickness question

Postby Robertfishes » Wed Feb 18, 2015 9:03 pm

Jim what I'm looking for is someone with wood/glass ILF limbs (long or shorts ) to give me a limb thickness of their limbs near the tip overlay and tell me what limb draw weight is with a 25" riser..I can do the math from there..I think... I just gonna make an educated guess?? Im trying to avoid making a 80 lb set of limbs or 10# set of limbs. prototyping can be a pain sometimes..the last proto I built came out 65#s not the 45# I was shooting for..
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Re: ILF limb butt thickness question

Postby Jim Casto Jr » Wed Feb 18, 2015 9:27 pm

I've got a set of 46# Hoyt wood/glass shorts. They measure 3/16" just below the limb tip overlay.

Hope that helps.
"Archery is really very simple. You just have to do the exact same thing on every shot"
Bill Leslie, July 22, 2017

"Form is everything."
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Re: ILF limb stack thickness question

Postby Robertfishes » Thu Feb 19, 2015 8:53 am

Thanks Jim, when measuring limb thicknesses we (garage ninny bow builders) measure in thousands of an inch using something like calipers. 3/16" is 0.1875". If I remember correctly Helens 42# carbon/foam limbs are 0.197" just before limb tip overlays. I not using carbon or foam..I may visit the big ASA 3D shoot this weekend and take my digital calipers to the Lancaster and Hoyt archery booths..they both should have ILF limb bows.
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Re: ILF limb stack thickness question

Postby Bobmeister » Sat Feb 21, 2015 12:19 pm

I put some light weight SF Axiom limbs on one of my 17" risers, they pull 23.3@28" . They have an 8" wedge and measure.180 at the fade or about 8.5" from the butt end. I put that in to the excel stack calculator and get .206" for 35#. BUT I'm sure they are using thinner glass then the .04 you are going with, take that for what it's worth :?
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Re: ILF limb stack thickness question

Postby Robertfishes » Sat Feb 21, 2015 3:27 pm

Bob, thanks for the info. I will be gluing a set up in the next couple of days..I was figuring 0.225 butt thickness on my form
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Re: ILF limb stack thickness question

Postby Bobmeister » Sat Feb 21, 2015 5:06 pm

With a .003 taper that will put you at .1995" at the fades. I think that will be close, can't wait to see what they come in at ;)
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Re: ILF limb stack thickness question

Postby Robertfishes » Sat Feb 21, 2015 7:54 pm

I made 2 sets of wedges this afternoon from Morado (rosewood).. I might have time to glue up a limb Sunday afternoon.. I have some 003 tapers, ULS glass and plenty of nice veneers to choose from
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Re: ILF limb stack thickness question

Postby Robertfishes » Sun Feb 22, 2015 9:12 pm

I have both limbs ready for glue up..The stack ended up at 0.232 at but... these will be long limbs with actionboo 003 taper, ULS glass and Olive ash burl veneers. I should have time to glue up a limb tomorrow afternoon.
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