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Mould with sharp corners and deep recesses.
Mould with sharp corners and deep recesses.
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Mould with sharp corners and deep recesses.
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Shinobiwan
Shinobiwan
posted 11 Years Ago
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Hi guys,
I've got my plugs to a stage I'm happy with and I'm about to start on the mould making. I've chosen the unimould system from easy composites. This will be my first time.
I'm worried about the release and sticking of casts though since there's a lot of 90 degree angles and sharp edges involved - this is unavoidable since its just the nature of the parts I'm making.
The part is two sided and will be done as split mould, the parting line is easy since there's a natural edge.
So far I've attached the plug to a sheet of glass and used filleting wax to seal stick it to this. Afterwards I've applied 5 coats of easy lease agents but also have both wax and pva on hand if needed. My question is what will be the safest option for a clean release. Nervous about ruining the plugs since there has been a considerable amount of time and money spent CNC'ing as well as finishing them.
Many thanks for any advice
Anthony
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Shinobiwan
Shinobiwan
posted 11 Years Ago
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Hey Warren and thanks for the help.
Its high build primer but cellulose and not 2k. I don't have the equipment to safely spray 2k and I'm asthmatic so have pretty sensitive airway/lungs and wouldn't fancy chancing it. I'm guessing this is a problem and the gelcoat will react with it?
I have never done this before but definitely want to learn. For the middle one, I was going to cut up the 100g CSM into short strands and pack them into the tricky parts then take small patches and lay them down in the coupling coat before the main reinforcement.
Any advice you could share would be invaluable.
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wozza
wozza
posted 11 Years Ago
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Shinobiwan (08/04/2014)
Hey Warren and thanks for the help.
Its high build primer but cellulose and not 2k. I don't have the equipment to safely spray 2k and I'm asthmatic so have pretty sensitive airway/lungs and wouldn't fancy chancing it. I'm guessing this is a problem and the gelcoat will react with it?
I have never done this before but definitely want to learn. For the middle one, I was going to cut up the 100g CSM into short strands and pack them into the tricky parts then take small patches and lay them down in the coupling coat before the main reinforcement.
Any advice you could share would be invaluable.
Hi, the cellulose is going to be a problem. The tooling coat is going to stick to it because of the styrene it contains. You may get away with PVA for the release agent if you spray it on thick enough. The downside to PVA is that you will have to do some work on the mould to bring it up to a gloss. The lay up of the mould won't be a problem, CSM will conform to the shape ok. I was meaning the lay-up of the actual part assuming your going for CF.
Warren
Carbon
Copies Ltd
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Shinobiwan
Shinobiwan
posted 11 Years Ago
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I should have mentioned that these won't be CF but just just poured with fast cast PU.
Hmm, that's a shame about the paint since I spent a bunch of time buffing them but definitely don't want things sticking so that'll have to be addressed before anything else can happen. Would it be possible to use pattern coat over the celly? If not then I'll have to go with the PVA release, how many coats would you suggests is thick enough?
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Mould with sharp corners and deep recesses.
Shinobiwan
-
11 Years Ago
First question. What are the plugs finished in, looks like high build but is it 2K? The middle one...
wozza
-
11 Years Ago
Hey Warren and thanks for the help. Its high build primer but cellulose and not 2k. I don't have...
Shinobiwan
-
11 Years Ago
[quote][b]Shinobiwan (08/04/2014)[/b][hr]Hey Warren and thanks for the help. Its high build primer...
wozza
-
11 Years Ago
I should have mentioned that these won't be CF but just just poured with fast cast PU. Hmm, that's...
Shinobiwan
-
11 Years Ago
Not sure if it depends on brands of PVA, but the stuff I use has excellent self-leveling properties....
Hanaldo
-
11 Years Ago
Applying most things by spraying makes it more hazardous to your health even PVA. If that was my...
wozza
-
11 Years Ago
if you're not in a hurry you could leave the plugs to season in a warm place for as long as...
Warren (Staff)
-
11 Years Ago
Big thanks guys! After reading all the advice and chatting with Warren I'm going to spray a good...
Shinobiwan
-
11 Years Ago
Thats pretty cool.
Atomant
-
11 Years Ago
Thats awesome! I need to get better with solidworks so I can get this sort of stuff done. WRT PVA...
FLD
-
11 Years Ago
Thanks for the tip FLD, I'll be sure to do a couple of light dust coats for adhesion first before...
Shinobiwan
-
11 Years Ago
I was told that several alternating layers of wax and PVA can be used when complications are...
brainfart
-
11 Years Ago
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