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Old 04-24-2008, 03:04 PM   #1 (permalink)
 
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Default Epoxy and Brass Tubes

Has anyone had trouble gluing brass tubes with 2 part epoxy? I have had 2 out of 10 fail, this is not acceptable. I have painted the outside of the tubes and tubes came out when I was using the barrel trimmer. I did notice that there was no paint on the tube that was exposed. I don’t know if it came off from the tube spinning in the blank or if there was a reaction with the glue. Any help would be appreciated.:(
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Old 04-24-2008, 03:20 PM   #2 (permalink)
 
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My first guess is that the ends of the tubes were not entirely clear. If even a small amount of epoxy gets into the tube and isn't entirely cleaned out, it will potentially heat up and bind the tube to the end mill shaft. The center shafts on the ends mills don't do much to dig out excess adhesive.

Plugging the end of the tube before interting it is the first defense against this, you might also try cleaning it out with a slightly smaller drill bit, I use a chain saw file to girnd out stubborn bits of epoxy or CA. Try sliding the tubed blank on the mandrel before end milling. If it will slide over the mandrel, then it is clean on the inside of the tube.
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Old 04-24-2008, 03:28 PM   #3 (permalink)
 
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I use nothing but epoxy and had one failure because of squeze out, meaning as the glue cured it pushed the tube out a little. I would try painting the inside of the blank more than the tube. Also try tinting the epoxy. It sounds like what you used to color the tubes would not bond to the tubes, espcially if there was no paint at all on the tubes when they came out.
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Old 04-24-2008, 03:31 PM   #4 (permalink)
 
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What kind of paint did you use? Did you wipe it down with lacquer thinner or acetone and rough it up with sandpaper?
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Old 04-24-2008, 04:00 PM   #5 (permalink)
 
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I paint the insides of the blank with Testors model paint instead of the tubes. Also, try lightly sanding the tubes on the lathe with 120 grit paper to remove any oils / contaminates and give the epoxy a good surface to adhere to. Since I changed from painting the tubes, I have not had any failures.
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Old 04-24-2008, 04:02 PM   #6 (permalink)
 
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Jim, I use nothing but epoxy and haven't had a problem. Make sure you scuff the tubes.
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Old 04-24-2008, 05:18 PM   #7 (permalink)
 
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I don't know what you mean by "fail". All I use is two part epoxy. Never a problem. I'm kinda sloppy and have to clean drops from the ends sometimes. Also, I don't understand Chaspers "will potentially heat up and bind the tube to the end mill shaft". I think he is talking about problems that do not exist.
Here is how I do it: rough tube with coarse sandpaper, apply epoxy to tube, put tube into hole.
Nothing complicated. Works.
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Old 04-24-2008, 11:42 PM   #8 (permalink)
 
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To tell you honestly, I don't even rough up the tubes. Never had a problem yet.
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Old 04-25-2008, 09:23 AM   #9 (permalink)
 
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Quote:
Originally posted by fitzman163

Has anyone had trouble gluing brass tubes with 2 part epoxy? I have had 2 out of 10 fail, this is not acceptable. I have painted the outside of the tubes and tubes came out when I was using the barrel trimmer. I did notice that there was no paint on the tube that was exposed. I don’t know if it came off from the tube spinning in the blank or if there was a reaction with the glue. Any help would be appreciated.:(
From your description it sounds like your paint is failing. If the blank is opaque I would not use any paint. If the blank is transparent or translucent I would use a different paint (I use testers model paint) to paint the blank and tint the expoxy.
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Old 04-25-2008, 10:08 AM   #10 (permalink)
 
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If I rough up the tube and then paint it so much for the roughness the paint just filled that in. If I paint it and then rough it up so much for the paint. What I ment by fail was it doesn't work.I have to paint the tubes because the tube shows through my blanks 90% of them. I think I will try the model paint and tinting to epoxy or maybe try thick CA glue. Thank you for all your input guys. If I have any more problems I will let you know.
Thanks,
Jim:)
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