Primitive Archer
Main Discussion Area => English Warbow => Topic started by: leehongyi on April 16, 2015, 01:33:30 am
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i built a 140lb boo backed Bubinga several days ago. the glue i used was titebond iii. yestoday i felt it was some more bent than original so i used a heatgun to treat it. after 1h's work it came back to ideal straight with brown appearance and some bbq smell. but when i strung it i found that the bamboo strip and wood were delaminated! the titebond melted when i heat it. what a fool choice to heat treat a laminated bow!
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Yeah, we all make mistakes, but we are man enough to confess to help others from doing the same. :)
I wasted a lot of time trying to heat straighten a bamboo backed Yew, the glue survived, but the bend returned after a week or so.
I ended up sawing it in half and making a take down.
Del
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Yeah, we all make mistakes, but we are man enough to confess to help others from doing the same. :)
I wasted a lot of time trying to heat straighten a bamboo backed Yew, the glue survived, but the bend returned after a week or so.
I ended up sawing it in half and making a take down.
Del
what glue can resist the heat?
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Heat treat the belly before you glue it to the bow, no glue is going to resist the temperature that you should get if you heat treat properly.
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Heat treat the belly before you glue it to the bow, no glue is going to resist the temperature that you should get if you heat treat properly.
Probably not strictly true. Epoxies and other adhesives are available that resist 600 degrees F.
We just don't tend to go looking for them but they are out there.
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Yeah, we all make mistakes, but we are man enough to confess to help others from doing the same. :)
I wasted a lot of time trying to heat straighten a bamboo backed Yew, the glue survived, but the bend returned after a week or so.
I ended up sawing it in half and making a take down.
Del
what glue can resist the heat?
I used resintite, but I was careful to clamp thin slats to the side of the bow to keep the heat away from the glue line and was very careful with the heat. I wouldn't recommend it, I heat treat the wood before glue up if I want it heat treated.
Del
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That's actually the biggest reason that I never use titebond 3. It is extremely heat sensitive. It never really dries hard, but stays somewhat flexible, and even in hot summer days, the heat and humidity is enough that it can cause separations. That's why I went to resorcinol. Never had a problem since - I haven't tried heat treating a resorcinol bow, but the glue is intended for industrial strength applications, so I can't help but think that it would fare better.
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All TiteBond glues release at 150deg(F). You can clean up the glue surfaces and re-glue the bow with a little reflex added.
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Smooth on will resist over 100 deg. If cured properly.