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Just a question.

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Just a question.

Postby charl » Tue Sep 23, 2014 3:01 pm

Hi everyone,

I decided to try and make a reflex deflex longbow as my next bow after the recurve and went to Ausbow to buy my supplies.

I asked John what he would recommend to get a 45 - 50 pound draw weight at 28 inches in a 68 inch bow.

He suggested that i use:

2 x .050 fibreglass laminations
3 x pairs of 100/1 Canadian rock maple laminations
1 x pair 90/2 Canadian rock maple laminations

And that that would get me in the ballpark.

Now I am learning as I go but this bow has turned out to be nearly 80 pounds!! Almost double what I was trying to achieve.

I have done some more research since then and at the thickest part the limb is .434 of an inch thick and according to Binghams that equates to around 75 pounds.

Did I get led astray or is this something I have done wrong in the making of the bow?

And here is a pic of the bow.

Image
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Re: Just a question.

Postby tjdeerslayer37 » Tue Sep 23, 2014 5:00 pm

a lot of it depends on width taper as well, what kind of taper are you running? i dont use .050 glass but if i kept that same wood stack with .043 glass back and belly in a 66" bow id be around 55-60#
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Re: Just a question.

Postby BK in TEXAS » Wed Sep 24, 2014 8:12 am

It will be tough to get that thing down to 50#. Finish it up.....hang it on the wall....and move on.

I'll send you a draw weight calculator I made in Excel so your next bow will be spot on weight. PM me your email address.
Hooked on Phonics......Helping kids read gooder since 1970.


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Re: Just a question.

Postby 4nolz » Wed Sep 24, 2014 8:26 am

.490!!!!!!!!!!!!!!!!!!!!!!!!



plus remember to get a micrometer and double check the lams when you get them sometimes they send the wrong thing.

I dont believe you can reduce it to 60# without it being too narrow and squirrely


ps I've done the same thing,too light can be managed too heavy is a waste of $$
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Re: Just a question.

Postby charl » Wed Sep 24, 2014 7:32 pm

Well, I made a string for the bow this morning and then measured the draw weight properly. Turns out this bad boy is 92# @ 28"!! :shock:

I shot a few arrows out of it and they fly nice, I can get it to full draw with some effort and I could probably get used to shooting it....

Thanks for the support so far, I certainly will try my best to not make this mistake again! I will take it as a lesson learned and move on to the next one once I have finished this one. I have started rounding the limbs over a bit to bring it down just a touch more but have made peace with the fact that this bow will never make it down to the target 50# I started with!
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Re: Just a question.

Postby charl » Wed Sep 24, 2014 7:35 pm

tjdeerslayer37 wrote:a lot of it depends on width taper as well, what kind of taper are you running? i dont use .050 glass but if i kept that same wood stack with .043 glass back and belly in a 66" bow id be around 55-60#


Do you mean the taper of the limbs from the side or from the front? (wide side).
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Re: Just a question.

Postby tjdeerslayer37 » Wed Sep 24, 2014 9:15 pm

Side to side
Save a tree, shoot a buck

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Re: Just a question.

Postby charl » Thu Sep 25, 2014 1:37 am

The taper at the fades is 37mm and 13mm at the string nocks. I decided to spend today getting to know this bow and finishing it. Makeing peace with the fact that it is going to be a heavy bow.

So here are some photos of it all done.

1013828_10203679364037088_9187007157757405381_n.jpg
1013828_10203679364037088_9187007157757405381_n.jpg (219.03 KiB) Viewed 4026 times


10392450_10203679362797057_356811395397743452_n.jpg
10392450_10203679362797057_356811395397743452_n.jpg (179.43 KiB) Viewed 4026 times


10653354_10203679361797032_6876605452727605081_n.jpg
10653354_10203679361797032_6876605452727605081_n.jpg (117.52 KiB) Viewed 4026 times


So I finished it with superglue and then used cabinetmakers wax on the whole thing and it is a nice satin finish. pretty happy with the final look of the bow. I will probably make another one the same and try to get the poundage I was after for this one.
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Re: Just a question.

Postby Robertfishes » Thu Sep 25, 2014 5:52 am

I'm sure the next one will come out at the perfect draw weight for you. I see that you used a butt joint on your tapers at center of bow. Have you tried to use a "scarf or skive" joint for joining tapers and parallels? It is a stronger joint than a butt joint. A few years ago KennyM posted a good tutorial on how to grind and glue them.
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Re: Just a question.

Postby charl » Thu Sep 25, 2014 1:25 pm

Robertfishes wrote:I'm sure the next one will come out at the perfect draw weight for you. I see that you used a butt joint on your tapers at center of bow. Have you tried to use a "scarf or skive" joint for joining tapers and parallels? It is a stronger joint than a butt joint. A few years ago KennyM posted a good tutorial on how to grind and glue them.


I was planning on doing that actually, but, (no pun intended!), for some reason the glue I used for that didn't let the laminations flex and the came apart there. So I got frustrated and sanded them straight again and just glued the bow up.

Both bows I have mad so far have ugly and uneven lamination joints in the middle so this is where I will focus my attention on the next one! Anyone have any hints or tips for preventing the laminations from sliding apart other than the "skive" method?
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