I just made a multi pieces mold, it will be both hand layup and also vacuum bag. I am going to layup carbon fabrics in each mold, and joint each pieces after. My question is how do you joint each pieces together?
from what I understand, you suppose to trim each pieces then replace them back into the mold then joint them together in the mold with cloth tape and resin on the inner side.
A multi-piece mold generally refers to one that is bolted together to lay-up, and then disassembled to remove the cured parts.
It sounds like you just have separate molds and want to put the pieces together after curing?
Well what happen is that, because the part has many contours and impossible to do lay up with all the angles so I have to do break down each angles separately then joint them after they cure. And for car rear wing(spoiler), how they joint the top and button together?
wings and spoilers are usually made to have a tongue that is on one half of the wing that laps over the other piece on the inside so that there is a fiber over lap bonding the two together. or you must put fibers over the seam after you glue the two halves together and do body work to fair the seam back in to the wing. Best way is a tongue so you do not need to do bodywork.
Sorry but what is tongue?
its an extention of fibers off one half of a part that will mate up on the inside of the other half to create a fiber overlap on the inside of the part.
ohh… thanks that sound like a good idea but mold will be hard to make. If I just use fiberglass over the seam line how do you prevent resin to flow to the surface of the finish side?
unless you have access to the inside of your part you will have to but fibers over the seam on the finished side of your part. make sure you sand and clean the surface well. tape off the part where you will not be fiberglassing, be neat and clean. wipe up any messes with acetone. I would also recommend using peelply on the fiberglass, this will help make a smother cleaner transition, makes for easier bodywork
Yes I do have access to the inside part, but a little hard to reach. I am think if I just tape off the seam line around the finish surface, then fiberglass the inside seam line will that prevent resin flow to the finish surface?
yea, putting masking tape or even “flash” tape across the seam then fiberglassing the seam from the inside should work fine, you might want to wet the glass out before putting it in to the part, however in certain situations it might be better to put the fabric in dry then wet it out.