By DeeCee - 9/19/2014 2:10:19 AM
Hi all,
I am currently moulding a bumper and want to ensure I keep things as genuine as possible.
I have a ridge/lip on the top of the bumper and some tabs behind it but am wondering on possible ways to replicate this as part of my split mould.
The ridge is 4mm thick as per pic below and runs along the top of the bumper as per the picture.
I am planning on building the flange for the mould as per this pic: black = bumper, red = flange, green = mould, blue = 2nd part of mould
questions:
a) how would I replicate the ridge using a split mould? Is my diagram the optimal way of achieving the ridge? I don't want to lose the mounting taps behind the top of the bumper as a steel reinforcement bar is located there.
b) how would I get fibreglass into such a small channel when reproducing the part when I did the lay up?
I did think that I would have to gelcoat the blue split mould and then fibreglass some material into the space then squeeze the fibreglass together as it was curing but I am worried that there will be voids between the two lay ups which I want to avoid.
Any help would be appreciated as this bumper is giving me some challenges and ideally I'd like to build a mould which will allow for one session lay up instead of bonding in additional parts.
Thanks
Dave
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By DeeCee - 9/19/2014 4:22:31 AM
brainfart - thanks for the feedback. Cutting around the tabs once cured may be additional work so I'll think about bonding in the tabs in.
Hanaldo - thanks for the suggestion. I have made pastes previously with shredded CSM and resin, so will take that into consideration on which option I take.
What I was thinking, was to lay 2x layer of mat into the ridge recess (after gelcoat) then add the paste in between then build the tab out with the main lay up. Or I go with brainfart's suggestion and add tabs onto the main piece. Fun decisions - now looking at a 5-9 piece mould (dependant on how I do this - silly Celica)
I am trying to keep the mould as dimensionally correct as possible. The bracket that fits onto the the tabs holds an additional trim piece between the indicators.
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