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Making a plastic mold


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chump 
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Joined: January 15, 2005
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Posted: June 17, 2005 at 1:10 PM / IP Logged  

Hey guys,

I was wondering if any of you might be able to point me in the right direction as to my next project. I would like to make a plastic mold out of an existing shape that I already have which is aluminum. I am planning on taping it, applying a release agent, and then duplicating the shape out of plastic. Basically the same way you would do it with fiberglass resin.

The question I have is regarding the materials I need. Is ther such a thing as polyurethane or ABS plastic that you can brush onto a surface that would cure and get hard? What I am creating needs to be very rigid and also needs to resist heat and cold which I am sure polyurethane and ABS plastic should be able to handle.

Do any of you know of such a product and maybe a website that sells it?

I would appreciate any info you might have.

Thanks.

abovestock 
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Posted: June 17, 2005 at 3:03 PM / IP Logged  
How big is the part in question. Probably use fiberglass for the project(but that is my response for everything). Some pictures would help a lot to know what kind of mold to build, and material to build it out of.
oonikfraleyoo 
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Posted: June 17, 2005 at 7:24 PM / IP Logged  
Check this out
Nik
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chump 
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Posted: June 17, 2005 at 8:20 PM / IP Logged  
oonikfraleyoo: Thanks for the info, I will check out Polytek to see if they have what I need. I cannot make it out of fiberglass since it will be going in my engine bay.
oonikfraleyoo 
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Posted: June 17, 2005 at 9:12 PM / IP Logged  
If you decide to go that route, let me know how it turns out. I've been wanting to give that process a shot as it looks like one could do amazing things with it. Alas, I'm lazy and that is alot of work.
Nik
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chump 
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Posted: June 17, 2005 at 11:44 PM / IP Logged  
Just incase you are curious, I am making an air intake tube for my engine.
oonikfraleyoo 
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Posted: June 17, 2005 at 11:51 PM / IP Logged  
hmm..sounds doable. Why are you not using the metal one? Weight reduction?
Nik
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chump 
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Posted: June 18, 2005 at 7:38 PM / IP Logged  

It's long story, heh. But basically I want to use a short ram system and make a box around it so that it does not suck in hot air from the engine bay. The reason I am not using the metal one is because the way the filter is angled on the end of the pipe will make it impossible to make the box around it. So I will be making my own custom tube that angles in a better way.

adambeazley 
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Posted: June 28, 2005 at 11:53 PM / IP Logged  
Have you ever thought about Carbon Fiber?
The process os almost Identical to fiber glass however you can get high temperature resins and hardeners so that you can place these pieces in the engine bay and not worry about deformation. If you find a plastic you can mold around that shape chances are it will deform under the high temps in the engine.
anyway just a thought.
97blackrodeo 
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Joined: May 27, 2005
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Posted: June 29, 2005 at 10:44 AM / IP Logged  
coming from a family of plastic injection molders, i can say injection molding is ur friend on this one. making something of this caliber would be very difficult with a "brush on" material. as some others mentioned, carbon fiber might be ur best option.
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