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bow swap build-along for catamount (finished pics p10)

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Re: bow swap build-along for catamount

Postby jwillis » Tue Sep 16, 2008 7:48 am

tjdeerslayer37 wrote:swweeeeeet jim, those are awesome. no hijacking, but how thick do you lay them up? 1"???

TJ, the net bows have three 3/4" x 3/32" x 60 to 72" lams. The length depends on the size of the hoop. Jim
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Re: bow swap build-along for catamount

Postby jwillis » Tue Sep 16, 2008 7:56 am

BullMtnArchery wrote:JWillis - Looking good. I like the riser wood combo you used.
I know you were shootin for 53# but the limbs came in real light. What were they?
also besides the .040 glass what were the specs on the wood lambs.

Thanks

Brock

Brock, these limbs had two core lams of actionboo tapers...they were .083" at the butt end during glue-up. I ground them on a .001 taper sled, but my grinder only grinds gets them down to about .0007 or so taper. I don't know why this happens on that grinder. It could be that the drum fills up and won't cut as fast as it moves down the lam? If you go with a true .002 taper you'll need to thicken these specs a bit. The wedges were 3/16" thick with 3-5/8" of taper past the end of the riser. I can't tell if they came out so light just because of the change from 1-3/4" to 1-5/8" in width, or if also changing from veneers plus boo tapers to only boo tapers also contributed. So on the next pair, I'm just calculating from here and using the same layup. On the next bow, I'm going to try veneers again and see if the draw weight spikes back up. If it does, then I'll know that this is just some rubbery boo...lol. Jim
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Re: bow swap build-along for catamount

Postby BullMtnArchery » Thu Sep 18, 2008 12:27 am

Thanks Jim. Look forward to seeing the new set.
Brock
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Re: bow swap build-along for catamount

Postby jwillis » Thu Sep 18, 2008 7:48 am

jwillis wrote:
tjdeerslayer37 wrote:swweeeeeet jim, those are awesome. no hijacking, but how thick do you lay them up? 1"???

TJ, the net bows have three 3/4" x 3/32" x 60 to 72" lams. The length depends on the size of the hoop. Jim

TJ, correction... there are four lams in the nets...two of each color. Jim
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Re: bow swap build-along for catamount

Postby jwillis » Fri Oct 10, 2008 8:16 pm

Sorry for being so long in posting an update. Since the last update, I've been spending all of my extra time working on the bow instead of posting updates, so now I'm getting into the sealing/sanding and will try to get caught up with the build along during the drying times.

I made new lams, overlays and wedges for the second set of limbs and glued them up one at a time. While those were curing, I worked on the riser again. I drew all of the lines for the sight window on the left side and back and belly. Just a word about the design...on recurves like this, I make the low point of the grip at bow center and the shelf 1-1/8" above that. The high point of the shelf is directly above the deepest point of the grip. This helps eliminate bow torque when shooting.
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I was going to cut out the sight window on the riser with an old dull bandsaw blade, but it was so old and dull that it simply burned instead of cutting. :roll:
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So, I put on a new blade and cut out all of the wood parts, staying just on the outside of the lines.
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This new Timberwolf is cutting through osage like butta! Its amazing how easy it is to stay on the line with a sharp blade.
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I like to cut straight across first, then make two angled cuts to radius the top of the shelf. The lines on the back and belly keep me from cutting too far.
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Second cut.
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Third cut.
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Then I started at the top of the window at an angle with my hacksaw.
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Then I went after it with my special hand saw that I got from my favorite bowyer in Taiwan. It was a wonderful gift from Hera.
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My template starts the grip a bit too deep at first...about 1-7/8".
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Next, I went after the sight window with this tool of mass destruction...a zirconium flap grinder attachment from Home Depot. This is the first time that I used this thing. It really eats it away fast, so I had to be careful.
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For me, it's just hard to beat a good round file for shaping the shelf and sight window.
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This one will be 3/16" past center (about half of an arrow diameter).
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I put a bit of a radius on the ends of the limb mounting pads. This is a small detail that I learned that keeps the riser from denting the limb overlay when the bow is drawn.
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Re: bow swap build-along for catamount

Postby jwillis » Fri Oct 10, 2008 8:36 pm

I do all of the major riser shaping with my spindle sander and this little drum sander that fits on my electric drill. Its hard to describe...I grind along the side, then turn the riser a bit and grind it back. I move the riser back and forth like this turning it a bit a time which rounds off the corners. I like a pretty sculpted riser so there is not much rectangle left after this is all done.
I made these marks on the belly as a guide. I just measure one place on each side, then hold my finger on the side of the riser and the pencil on the mark. The pencil will follow the contour as I move my hand down the riser.
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As the grip is shaped, I measure it as I go to keep it a bit oversized when the rough shaping is done. This way, there is some material left for the sanding process to come later. The width for this one (for now) will be about 1-3/8" wide.
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The depth for now will be about 1-7/8" deep.
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And the sight window will be at 1/8" past center. Well, its still pretty fat but I'll leave it there for now and finish it later with my files.
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Re: bow swap build-along for catamount

Postby Catamount » Fri Oct 10, 2008 8:59 pm

Looking great man, can't wait to try it out. I love the osage.
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Re: bow swap build-along for catamount

Postby tjdeerslayer37 » Fri Oct 10, 2008 9:47 pm

this build along has me itching to make a t/d again, i havent made one since my very first bow that scared me away from them. lol. i love the contours on that riser, looks great!
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Re: bow swap build-along for catamount

Postby BullMtnArchery » Fri Oct 10, 2008 11:09 pm

Looking great. Hopefully the new limbs come out to the weight you wanted.

Brock
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Re: bow swap build-along for catamount

Postby Crooked Stic » Sat Oct 11, 2008 4:56 am

Lookin good j. Love the osage.
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