Carbon fiber sheet, pores.

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Carbon fiber sheet, pores.

Author	Message
M. Martin	M. Martin posted 7 Years Ago Topic Details
Group: Forum Members Posts: 4, Visits: 43	Hi, it´s happened to me twice already. I make a carbon fiber sheet and on the surface there are pores and micro pores. I do it with a glass, once with weight making a sandwich with another glass behind and again, without weight and without glass behind. Both pores have come out Something else happens to me, too. To cut the CF I use Dremel with disc to cut plastic. If I don´t make the cuts fast, due to the heat of the cut, along the cut the epoxy resin remains as curved, to the sides of the cut Any advice? Regards.
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scottracing	scottracing posted 7 Years Ago Post Details
Group: Forum Members Posts: 460, Visits: 5.2K	sounds like the carbon isnt completely wetted out, you need to use a bristle roller to ensure the resin gets into all the fibres. I wouldnt use a plastic cutting disc, try and buy some tungsten carbide cutting discs
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M. Martin	M. Martin posted 7 Years Ago Post Details
Group: Forum Members Posts: 4, Visits: 43	Hi! Thanks for answering! I have a bristle roller but i think that i don't use it enough. The hardener is too fast, i think i should buy a slow hardener. I will use the rest of fast hardener by parts and apply the roller much more! I will buy a tungsten carbide cutting disc Thank you very much!
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Hanaldo	Hanaldo posted 7 Years Ago Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	Be aware that the 'wet-lay' technique you are using to make the sheets will quite often come out with some pinholes on the surface, it takes some practice to get a cosmetically perfect wet-laid piece. Also when trimming, it sounds like you are cutting too close to the size that you want. High rpm cutting tools like Dremels and angle grinders will create a lot of heat, which can cause the resin to delaminate from the fibres and leave you with a fuzzy edge. It is best to cut slightly over-size, say about 1mm, and then sand the edge back to the exact size that you require. Finishing with 320 grit or higher will give you a nice smooth edge that won't give you nasty splinters!
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M. Martin	M. Martin posted 7 Years Ago Post Details
Group: Forum Members Posts: 4, Visits: 43	Thanks for your tips! Later on will try to make the leaves of CF by resin infusion, but for now for economy i do it hand layup. I take note of all your advices! Thank you very much!
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