carbon fibre

Post by **NafemanNathan** » Fri Mar 23, 2012 8:12 pm

A1ex wrote:Sounds cool, will be a job and a half sanding the glass to get a good bond though!

I thought this was a joke about covering the mirror-glass from the wing mirrors... Obviously not

A1ex · Post by **A1ex** » Fri Mar 23, 2012 8:25 pm

OK, first of all a have the following spoilers to mould from;

5g bonnet spolier
5g mid line sir type s spoiler
and...
5g mugen replica spoiler

Don't have any pics ATM

For the gear surround I used a negative mould and layering up in this and used the original part on the bottom g-clamped for the pressure.

So for the spoilers, I was thinking of taking a negative mould of the top and bottom so they fit together but hadn't got passed that.

From what you've said, if I then use the negatives to guide the making of the inner components the wrap and resin this part, stick it in the mould jobs a good un?

I did have a different idea, that was to use a balloon to push the CF and resin up against the surface of the moulds (sandwiched between top and bottom moulds). This would then give a much quicker fill for the difficult shape without as much precision work, obviously this would be very dependant on the balloon which is used but I think it's possible...

littlefeller · Post by **littlefeller** » Fri Mar 23, 2012 8:48 pm

have you tried vacume bagging, have a look on google, this would save the hassle of ballons, vacume agging just uses the ambiant air pressure win win.
a negative mould is the way i would do it too,
i would divide the original down the middle (horizontal) cast each side against the dividing board, you will need the straight edges the boards leave to enable you to joint the two halfes of the job togeather.
so, divide original down the middle with board, cast 1st half part of mould ontop of waxed original (fibre glass) upto and onto the board, allow to cure, then remove divider board, wax second half of original including the edge of the mould left by the dividing board, then cast 2nd part with the first part still in place., you could then just apply resin to the preped mould halves wait till tacky, just wet and lay the fiber with a small roller layer by layer waiting till tacky between each one. no bagging req

it wasnt the glass that was coverd, the mirror moulding, body if you like

A1ex · Post by **A1ex** » Fri Mar 23, 2012 8:57 pm

I know about vacuum bagging, wouldn't work with the current hollow negative mould scenario however. Also it's quite expensive in terms of upfront cost for the pump and the amount of disposable items it creates with bags and hoses etc.

Good thinking with the split mould It did cross my mind, however when doing the second part how can you ensure the fibre doesn't lift up from the surface of the mould as there isn't any pressure on the part when its curing?

littlefeller · Post by **littlefeller** » Sat Mar 24, 2012 7:00 am

found it

littlefeller · Post by **littlefeller** » Sat Mar 24, 2012 7:05 am

just allow each half to cure one at a time, if your making larger parts, i used to use plastic sheeting placed on the inside and fill it with fine sand, supose water would also work, this applys the presure your looking for

if your having lifting problems, try changing the way your working (practice different techniques) you tube is full of different ideas. i found this a god sent when working on fibre glass

littlefeller · Post by **littlefeller** » Mon Mar 26, 2012 6:38 pm

just incase the window spoiler obscures the high level brake light i will have to raise a section half way along, but it still looks ok. i know some people dont like these - tough

By littlefeller2010 at 2012-03-26

Post by **indigolemon** » Mon Mar 26, 2012 7:20 pm

littlefeller wrote:i know some people dont like these - tough

Sounds like you're going to have them made mandatory

littlefeller · Post by **littlefeller** » Mon Mar 26, 2012 7:32 pm

yep, need some practice before i do my sunroof

mercutio · Post by **mercutio** » Mon Mar 26, 2012 8:31 pm

why dont you just make a roof panel?