V-shaped twill when skinning

Talk Composites - The Forum for Advanced Composites

Back

V-shaped twill when skinning

Author	Message
Zero Mass Motorsports	Zero Mass Motorsports posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 5, Visits: 59	I've done V-weave placements for decades the same way. I lightly mist the Carbon cloth layer out on a large surface cutting table, then carefully roll out and over a sheet of poly plastic sheet previously coated with semi-perm release. Once in place I use a long aluminum straight edge to and a very sharp razor to make the alignment slice. Flip the cloth for an opposing weave direction and razor cut it. I'll loosen the plastic sheet just before I lay the opposing weave layer to avoid struggle. My mold is pre-scribed for such applications making it easier to install the first and second ply. Second ply overlaps by 1/2". I'll reverse the weaves again for the back-up layers to keep things even.
	Reply Like 2
wildcard	wildcard posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 40, Visits: 406	Hi everyone I'm new, but I've been following this site from the states reading everything I possibly can in every thread. I think a great way to fix your problem of doing the V weave with 4x4 twill is by getting your hands on some lightweight fiberglass hexel 120 which is a 3.1 ounce or fiberglass veil which is .3 oz. You then spray some adhesive spray, either super 77 or the airtac 2, and a secure it to the carbon fiber. This will allow you to cut it straight without fraying. It will also keep the weave from distorting. The hexel 120 used as a backing makes nice cut lines with a rotary blade. You can adhere it the back of all the carbon as a tape. Adhered it with the spray adhesive and then cut in half to get a perfect line. I'm doing this right now with a front end that I'm making for a vehicle. However, I'm using a mold but I believe this technique would work if you were doing an overlay (which I assume is your guys version of a skinning). Well, since I broke my ghosting silence, I guess I better head to the introductions forum. Best of luck. Edited 12 Years Ago by wildcard
	Reply Like 3
StanTheMan	StanTheMan posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 61, Visits: 380	Since it's skinning we're talking about, I don't think that structural strength is an issue. As for using pro-finish, that's not an option as I want to make the part using 4x4 twill fabric....
	Reply Like 2
andygtt	andygtt posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 157, Visits: 1.2K	I did this over the roof of my car... i.e. skinned the roof with a V weave carbon. It looked ok but wasn't possible to get as good a finish as I do with my in mould V weave parts (Ive decided to take moulds and do it in mould). I use Pro finish carbon which is a cloth impregnated with a small amount of resin one side to hold its shape.... The skinning kit from EC is the way to go, I tried sticking it down then resin over the top however the resin lifts the glue and it floats in places, I had to remove it and start again. If you look carefully at this pic of the roof you can see the skinned V weave. I finished it off with lacquer.
	Reply Like 2
Matthieu Libeert	Matthieu Libeert posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 955, Visits: 3.4K	I would never leave anything inbetween the carbon that could weaken the part... so I would not do it... Here are some solutions: 1. EC sells a special carbon (Profinish https://www.easycomposites.co.uk/200g-profinish-coated-22-twill-3k-carbon-fibre-cloth) that is not Prepreg but similar in handling, you can easily cut through and have nice straight line 2. You can use a special composites glue, I have one in spraycan. You just spray it on the area you would like to cut, wait a bit for the glue to lose his tack and than cut through. 3. If you want to remove that tape you could use some acetone to dissolve the glue in the tape and you can remove the tape Hope this helped you out a bit! Matthieu Libeert Founder MAT2 Composites X Sports website: www.mat2composites.com
	Reply Like 2
carbonfibreworks	carbonfibreworks posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 292, Visits: 4.5K	Hi Stan the Man Use pro finish and a metal straight edge plus a scalpel with a good blade to cut clean lines in the carbon,you can then butt joint the the two pieces of fabric. Chris www.carbonfibreworks.co.uk
	Reply Like 3
StanTheMan	StanTheMan posted 12 Years Ago HOT Topic Details
Group: Forum Members Posts: 61, Visits: 380	Hi guys, Thinking of giving this V-shape a go (you know, the Pagani/Koenigsegg thing). I just don't know how to approach this correctly. I'm using dry fabric (no pre-preg) so obviously, I will have to use something to hold the fabric together when I cut it because it will simply fall apart and I will not be able to get anything aligned in a V-shape. I know that if I use some painters tape it will hold the fabric well and I can align it but I will have to leave the tape there because if I try to pull it off, it will destroy the fabric. I guess my question is, if I leave the tape there and apply the fabric on the tacky gel coat, would that be a problem? It will obviously be on the backside of the fabric but I was concerned whether I will have adhesion problems where the tape is? Or if that's a no-good method, I'm open to suggestions Regards, Stan
	Reply Like 4