From: Oldbowyer
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Date: 16-Dec-14 |
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This is my Dads form and the last riser his hands touched that goes into that form. The form needs work and the fade outs on the riser will need repaired. I have a finished bow of this model that came out of the form and I'm confident I can repair the form and riser to his specs
I have often considered finishing this riser. Sort of a father son project! My concern has always been putting it and the form into a hot box for the EA40! My first set of limbs with EA40 at room temp. Did not go so well have always used a hot box of some sort sense! Jim in your first post to me you said you used G2 at room temp on statics. I know a little something about bow designing and I know a static puts a tremendous amount of stress in the working section of the limb. I've rooted around some since to see what I can find. About the only thing I have found is using it with Ipe has gone south some times. The numbers on the stuff does look good and here is the nub of this thread. Have you or anyone else done a sheer test? just to see what it takes to pull it apart. But I'm most interested in when things went south with a bow and what you or anyone else thinks happened to there project!
My Dad always told me we learn more from our mistakes! "IF" I do this my intent is to learn from you all as much as I can. If you all are willing to take the time and share the info.
This is a one shot deal and this bow will not be a wall hanger. My deepest thanks to all of you who can help me out on this.
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From: Chemsolder1
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Date: 16-Dec-14 |
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Cool project! Never used G2 myself but am very interested to see how this turns out! Could always use that form to make a new one too, a good pattern bit and router.
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From: Trux Turning
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Date: 16-Dec-14 |
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That's a cool looking riser! With no second chances I can see why you are apprehensive- I've never used G2 but I have used smooth on without a hot box on a number glue ups- I just let it cure at room temp for 24 hours or longer- what kind of problems did you have with your first set of limbs?
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From: Stoner
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Date: 16-Dec-14 |
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Moving to Arizona from Michigan took it's toll on a couple selfbows I had. Had a handle let go and static tips. I originally used the West System in MI. When all my wood dried out here in AZ. I reglued with G2 with good results so far.
I have some mesquite billets drying and would like to try splicing them. I will follow this thread to see who else will chim in. John
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From: Stoner
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Date: 16-Dec-14 |
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Got this little fella after G2 glue-up. John
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From: fdp
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Date: 16-Dec-14 |
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Oldbowyer, I believe the sheer on G-2 is more than on EA-40. Let me look for stats. and I'll get back with you.
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From: fdp
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Date: 16-Dec-14 |
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Nope...don't have it. However, the tensile strength of G-2 is higher than that of the glass. Also, G-2 tensile strength is 6,000psi while EA-40 is 3,400. Compressive strength of G-2 is higher as well, 12,000 vs 8,100.
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From: dire wolf
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Date: 20-Dec-14 |
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Oldbowyer,..I have used the G-2 two part epoxy for over 20 years..Tech specs are very good on it..Non critical 2:1 mix..decent pot life, cleans up with hot water & soap before it cures..Cures at 70F in 24 hours..No hot box required tho one can accelerate the cure time with heat. I used to buy it from Canada but now there are folks who have it in the USA..Great for oily-tropical woods, backings on selfbows, laminated bows with glas or carbon etc..Jim
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