Westfield parts from a newbie


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Brian2fast
Brian2fast
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No, I will use it. I made it so I'll dam well use it if kills me,  haha.

That's great, I've got three new things to focus on this year.

Get the resin and mould up to a nice temp beforehand.
Mix my resin in 400g batches.
Use a circle of breather as a choke on the outlet. (I think this one might really help me out)

Think I'll also try MTI hose just cos I want to try it.

Glad I posted now.

How is the Kitten shell coming on Warren? Looking forward to seeing that when it's finished.

Craig
wozza
wozza
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Shell should be going to the paint shop this week for top coat. Then we can start working out split lines and fitting flanges.w00t

Warren

Carbon Copies Ltd
Hanaldo
Hanaldo
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MTI Hose is great Brian. Not always necessary, but because it makes it possible to develop a completely closed system, it can save some parts if something goes wrong. 
wozza
wozza
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brainfart (28/09/2014)
> When I have a line clamp not full open it seems to create bubbles,

When I read this, I certainly wouldn't recommend to...

>
use my big new vacuum chamber as a  door stop......   Smile

Not at all. Quite to the contrary.

Degas. Do it.




Sorry but I have to disagree with Brainfart on this one. Up until recently I was doing 15+ infusions per week of varying shapes and sizes some of which where for some very demanding Blue Chip companies. Out of those parts I had only two failures both caused by power cuts during the actual infusion process.
All done without degassing. The more processes you add into the mix the more chance there is of things going wrong, and trust me people get degassing wrong. Keep it simple.

100% sealed bag, carefully placed feed and vac points, correctly placed flow mesh and spiral, correct infusion grade Epoxy resin carefully mixed in small batches and you will get perfect parts.Smile

Of course this is just my opinionSmile Warren




Carbon Copies Ltd
Hanaldo
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My opinion also ^ 
brainfart
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Let me quote this again:

> > When I have a line clamp not full open it seems to create bubbles,

This to me sounds like there are visible bubbling going on when the resin starts to infuse the part. So there is clearly some sort of outgassing taking place. (or did I totally misunderstand this sentence?)

If infusing parts works for you without degassing, fine, then do it without. Not using degassed resin is another source for error for the inexperienced. Just look how many posts and questions there are about infusing with (in my opinion usually unsuitable)
VE and polyester resins. And epoxy resins of unknown origin, with god knows what volatile ingredients. Blanket statements like "degassing unnecessary" might be true sometimes but certainly not all of the time.

>
The more processes you add into the mix the more chance there is of things going wrong, and trust me people get degassing wrong.

The main problem I see here is people not really understanding what is going on, and trying to get ahead of themselves. Infusion isn't exactly a simple process for beginners, people need to learn how to do a proper wet layup without vacuum bagging etc. before progressing to more advanced procedures.

And degassing is dead simple if you do it right. Like NOT trying to degas an enormously thick layer of resin in a narrow, high container. The thicker the layer to be degassed, the harder the process is because the vacuum at the bottom of the resin container is much worse than that at the top of the resin. Simple basic physics.

wozza
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If you read any of my replies to people's questions they are all based around "what works/doesn't work for me" and never this is the only way to do things, all based on experience.

I certainly don't use statements like "Degas. Do It."

Unfortunately many forums have "armchair experts" who read a question, go off and google it and then copy and paste answers from other sources. Not based on experience.

Warren

Carbon Copies Ltd
brainfart
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> Unfortunately many forums have "armchair experts" who read a question, go off and google it and then copy and
> paste answers from other sources. Not based on experience.

Nice.

>
I certainly don't use statements like "Degas. Do It."


Taken out of context. You forgot to mention the lines before that statement. Degas, if there is visible frothing of the resin during the infusion.


Edited 11 Years Ago by brainfart
Dravis
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I would not call myself an "expert" at infusion ... I probably only really have limited experience.. But:

Polyester resin is just pure trouble, even when trying to vac-bag it ... tried that .. did NOT like it...

I'v never used VinylEster, so no experience there..

I've tried at least four different resin systems for infusion, only one ( EC IN2) worked perfectly, given a perfectly sealed bag, no degassing, the resin degasses perfectly during the infusion, as far as I can see in my smallish projects.

I've infused West systems 105, and it works too, but has very slow infusion rates, again, it seems to degas fine during infusion.
(completely Pin-hole free parts are rare with this resin)

EC EL2 seems almost identical to West 105 when infusing it. (Again almost always a small number of pinholes, my theory is that the higher viscosity resin traps more gas in the fabric.)

EC High temp will infuse, but it is near impossible to get pin-hole free parts.  It helps to heat the resin to maybe 30 - 40 deg, but infusion then has to go quickly and without problems, or you may run into trouble with the resin either exotherming in the pot or gelling at the last part of infusion.   Consequently I usually degas, wet-lay and Vac-bag, going rather resin rich.

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Whitebits
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This thread is truly inspirational

I''m building a race car!
I believe that if life gives you lemons, you should make lemonade..and try to find somebody whose life''s given them vodka and have a party - Ron White
Racing is life. Anything before or after is just waiting - Steve McQueen
GO

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