Cover 10mm carbon fiber tube inside evenly with epoxy resin?

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Cover 10mm carbon fiber tube inside evenly with epoxy resin?

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valzine	valzine posted 9 Years Ago HOT Topic Details
Group: Forum Members Posts: 6, Visits: 21	Hello everyone, I've been searching the forum but couldn't find the answer to my question. I'm trying to cover the inside of a 10mm carbon fiber tube with inner diameter of 8mm in thin layer of high temp food safe epoxy resin. The inner aperture is very important to me (precision I'm looking for is up to hundreds of mm). I achieve needed inner diameter by drilling with precise drill bits. The tube is approximately 50mm in length. My questions are: 1. Can I somehow spay the epoxy inside or do I have to apply it by hand? If applied by hand, what would be the best tool to use? 2. Would 3k rolled carbon fiber tube absorb the thin layer of epoxy resin and leave the inner aperture the same? Or do I have to polish it somehow (drill again?) after I apply it? Here is the resin I'm intending to use: https://www.atomadhesives.com/FDA-Grade-Food-Medical-Epoxy-Adhesives/AA-BOND-FDA8-FDA-Grade-Epoxy-Adhesive-Medical-Food I would appreciate your input! Thanks a lot in advance. Tags carbon fiber epoxy resin food safe high temp tube Edited 9 Years Ago by valzine
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f1rob	f1rob posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 237, Visits: 4.8K	Why not cap one end,fill with resin when hard drill out and ream to size ?
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valzine	valzine posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 6, Visits: 21	f1rob, thank you so much for your reply. That sounds like a good idea. Wouldn't that be wasting a lot of resin though? The resin I'm looking to buy is quite expensive, and I need to make a lot of those parts.
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Hanaldo	Hanaldo posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	Well you could fill with a cheaper resin, drill it out slightly larger than needed, then fill again with the food safe resin. Very labour wasteful though. In all honesty, I don't think it would take a hell of a lot of resin to fill a tube of the pictured size. Probably 20ml or so, if that.
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valzine	valzine posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 6, Visits: 21	Hanaldo (28/09/2016) Well you could fill with a cheaper resin, drill it out slightly larger than needed, then fill again with the food safe resin. Very labour wasteful though. In all honesty, I don't think it would take a hell of a lot of resin to fill a tube of the pictured size. Probably 20ml or so, if that. Hanaldo, thanks a ton for your reply. What if I just use some kind of a foam applicator and paint it inside with a thick layer? Then drill to size? Would it work or the resin would just deform while being cured? Thanks!
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Hanaldo	Hanaldo posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	It just isn't very precise. The most precise way would be to completely fill them and then drill them out.
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f1rob	f1rob posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 237, Visits: 4.8K	Really the most precise way would be to make it in stainless wouldn't it ??? why has it got to be composite ???
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valzine	valzine posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 6, Visits: 21	f1rob (28/09/2016) Really the most precise way would be to make it in stainless wouldn't it ??? why has it got to be composite ??? f1rob, thanks for your question, it's actually a very good one. The inner aperture is so important that it can't change with temperature fluctuations.. Steel has a higher coefficient of thermal expansion, just as pretty much any metal.. You heat it up and it would expand like hell..
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ChrisR	ChrisR posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 363, Visits: 3K	What sort of service temperatures and why must the inner aperture be 1/100th mm accurate? (how you achieve or even measure this is beyond my comprehension unless you have state of the art facilities) The only practical way would be to make your own tube using a mandrel of just under the size you want, allowing for expansion of the mandrel during a heated cure cycle. Use the "food safe" resin as the main matrix & bobs your uncle
	Reply Like 7
valzine	valzine posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 6, Visits: 21	ChrisR (29/09/2016) What sort of service temperatures and why must the inner aperture be 1/100th mm accurate? (how you achieve or even measure this is beyond my comprehension unless you have state of the art facilities) The only practical way would be to make your own tube using a mandrel of just under the size you want, allowing for expansion of the mandrel during a heated cure cycle. Use the "food safe" resin as the main matrix & bobs your uncle ChrisR, thanks for your reply. I was able to measure 135C the highest. Obviously, during the winter it can get as low as -20 - 30C when the device is not operating. This will cause huge fluctuations with any metal, the only exception would probably be Invar but where to even get it lol? As far as about measurements I measure another tube that goes inside of that cb tube with a micrometer that has .01mm accuracy, which allows me to select the right tube for the aperture and achieve the desired coefficient of friction.. It's actually easier than you think. And the drill bits are pretty precise when sharp ;-) Edited 9 Years Ago by valzine
	Reply Like 6

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Cover 10mm carbon fiber tube inside evenly with epoxy resin?

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