TomW wrote: ↑
Sat Dec 30, 2017 12:42 pm
I understand and suspected the accuracy would be an issue. Can't get away from that problem.
Despite that, my thinking was to first layup glass over it to stabilise shape. Then use CF in vbag. Not full pressure. Anyway I think you are right that it is the wrong way.
I have a Form2 also, an SLA machine. My model wing will take 495g of epoxy and that costs 100€! Wing is hollowed out for most part. Using solidworks.
Back to your method. You will make mold for each half of wing. Top and bottom.
Then what is your laminating approach?
My thinking would to put light weight CF weave first 1-2 layers . And v-bag each half. To get best surface against mold.
I can't figure out how to avoid getting fiber into part line of mold. Just trim carefully I guess.
I don't have prepeg possibilities.
Then after cure fill each half with CF until it's filled and then clamp molds together? Seems hard to get it filled, but not under or over filled.
Yes, I will make a two piece mold.
The halves will be glued together with Sicomin. It is an epoxy foam. I know from a picture that Moses is doing it the same way at least in the mast. The profiles I use are between 7 and 9% thin.
That is close to nothing. So I face a full mold, means whatever fits in the mold will be carbon.
I understand that you have a two piece mold. You can create the surface with crepe adhesive tape. Remove it, stick it on a thin piece of wood, cut it out and you have one half of your wing surface.
Put a transparent sheet of foil on a solid piece of wood. Resin and one layer carbon. Another piece of foil on top. Then take a sharp cutter and cut around the template. Remove a piece of foil, place it in the mold, remove the second piece of foil.
Make sure that the carbon is not higher then the frame of the mold one you have all layers set. So you will around six templates. Three for each side. A big, smaller and much smaller one. Saves you sanding.
By the way, the reason why some companies have such a terrible surface is the circumstance they use prepreg. So no worries in this case.
Hope this was helpful.