Subject: RE: [baidarka] Glue
From: Calman, Scott (scott@ucsd.edu)
Date: Thu Apr 06 2006 - 12:58:53 EDT
Be careful with the heat gun. Here is my experience:
I work for a Structural Engineering department at a major university. One of the things we do are large composite lay-ups as structural reinforcement of concrete and steel structures, as well as some composite UAV aircraft component work. One of the key things they do to get a full cure with epoxy is what they call a "Post-cure bake" we built a 12'X 24' oven that we can move the components into and then quickly heat them up to 3500f. for 1 hour. If you overheat them, they become brittle and do not survive. I asked the guys what "overheat" means and they said anything over 4000f. for more than 10 minutes. Mind you, most of the pieces they are using are a lot bigger and thicker than anything we do so adjust your time down.
A heat gun can put out significantly more heat than 3500f. so be careful and baffle the thing. I actually caught a small lay-up I was doing on fire once and now bake my small parts in the oven in the house.
Scott Calman
-----Original Message-----
From: owner-baidarka@paddlewise.net [mailto:owner-baidarka@paddlewise.net] On Behalf Of Mitchell James
Sent: Monday, April 03, 2006 10:59 PM
To: baidarka@paddlewise.net
Subject: Re: [baidarka] Glue
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Hadn't thought about the heat gun. That sounds good. I am
experimenting with the single sleeve that Tom pictured on his
website, but with one modification. I am going to slice the ferrule
diagonally about an inch from the end and glue the small piece on one
side, then glue the long piece to the opposite side. That way when
the paddle is assembled, it will automatically lock itself against
rotation. Also, I will have a good surface for the tape.
Thanks for your suggestion.
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