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Author Topic: Recurve Bow Build  (Read 3639 times)

Online advCo

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Re: Recurve Bow Build
« Reply #10 on: Feb 28, 2017, 21:16:33 »
Are you using prepreg fiberglass? Just wondering what the bake box is for since most epoxy resin cures at room temp.
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Offline firebane

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Re: Recurve Bow Build
« Reply #11 on: Feb 28, 2017, 21:20:59 »
I made one of these for my dad in highschool. It was tested to a 75lb pull.

Offline Cookie

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Re: Recurve Bow Build
« Reply #12 on: Feb 28, 2017, 23:57:36 »
Subscribed! Can wait to see this come out!
Man, now I'm going to have to start posting bow builds! I'm about due for another selfbow anyway lol .
Looking forward to this, Kamn

Are you using prepreg fiberglass? Just wondering what the bake box is for since most epoxy resin cures at room temp.

Boyers glass comes as pre-cured strips. Curing in the oven is thought to offer better temperature resistance  (or to speed up the Curing process).
« Last Edit: Mar 01, 2017, 00:00:00 by Cookie »
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81 CB750C
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Kamn

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Re: Recurve Bow Build
« Reply #13 on: Mar 01, 2017, 08:23:15 »
Here is a link to the fibreglass Boyers use  http://www.binghamprojects.com/proddetail.php?prod=UL
The epoxy is from a company called Smooth On and its there EA-40 line which says to cure it at 140 degrees for several hours
Here is some info on the Epoxy  https://www.smooth-on.com/products/ea-40/


Kamn

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Re: Recurve Bow Build
« Reply #15 on: Mar 06, 2017, 08:16:40 »
Well this past weekend I was able to get further ahead on the build..........

I saw another bow build where the guy covered the face of the form and the top pressure strip with EPDM rubber and I liked the idea because it gives the a little cushion and pressure back in any places the form may not be perfect, so I did the same





I got my inner tube straps cut and ready



Waxed the form face and pressure strip (1-3/4" strip of galvanized 16g sheet that goes on top of the bow before getting pressured down)



Then I got the wood and fibreglass strips cut, cleaned, and high temp tape on the shiny side of the fibreglass, which means that I also need to wear rubber gloves from this point forward to keep everything clean





while I was mixing and prepping the epoxy in equal parts, the wood strips went in the oven to worm up which helps open the grain to allow the epoxy to soak into the grain......you don't want any dry spots at all or its gonna blow apart on you when you string it up







Prep the form with saran wrap to try and control the epoxy that will spill out during the cure




Then it was time to lay the layers of fibreglass, tapered maple, riser, parallel maple, fibreglass, and the pressure strip. Then the bitch part of clamping and strapping it down to the form with slippery epoxied layers but I managed somehow



Then into the oven for 5 hours


And later that day




BUT, I had a problem......the damn layers shifted slightly on me while cooking!!!  FFFUUU@@@KKK

WHich means I will need to work harder at correcting this by trimming the sides all along the bow on the sander, then I can go ahead and find centre and go from there

More to come

Online JustinLonghorn

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Re: Recurve Bow Build
« Reply #16 on: Mar 06, 2017, 08:46:04 »
Righteous.
I'm going to eat your brains and gain your knowledge.

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Kamn

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Re: Recurve Bow Build
« Reply #17 on: Mar 06, 2017, 09:05:58 »
Some things I learned and figured out
1. the oven is too hot.......I need to bring the temps down with lower watt bulbs. I nearly burned the saran wrap
2. I need guides down the sides of the form to keep the layers from shifting
3. I will need heavier rubber bands....probably truck inner tubes or motorcycle because I had a few bands pop on me when strapping it down and 1 popped while cooking which meant me opening the oven and quickly securing another band

Offline SONIC.

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Re: Recurve Bow Build
« Reply #18 on: Mar 06, 2017, 09:51:52 »
Very cool!

I say build the inverse of the form and then put a sealed firehose between the two, clamp them together and air it up.

Online irk miller

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Re: Recurve Bow Build
« Reply #19 on: Mar 06, 2017, 09:55:33 »
Some things I learned and figured out
1. the oven is too hot.......I need to bring the temps down with lower watt bulbs. I nearly burned the saran wrap
Unless you need humidity, you can also manage heat with muffin fans.  In the dry boxes I build for ceramics, we want the humidity out, so muffin fans do the trick.  You can also install a dimmer switch.  I've also built them with baseboard heaters as the heat source.  I want 180 to 200 in my dry boxes, and those methods have given me that control.