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Thread: Plastic molding on a budget?

  1. #11
    Constant Bitrate rotarypower101's Avatar
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    So I guess the next question would be how much and where can a guy get SLA work done?

    I can build cad files for exactly what I want in a matter of hours, where can someone just walk off the street and ask for work like this to be done?

    And how much does something like that roughly cost per geometry and size?

  2. #12
    Raw Wave shotgunefx's Avatar
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    Quote Originally Posted by rotarypower101
    WOW that looks like it may have some potential.

    Have you seen any parts that were made from this material?

    I usually have the means to get a rough shape by making a mold, and then work from there, but it is very difficult to cut a part from a strait billet at times, and impractical!

    I wonder what the structural and thermal properties of this material is compared to std. Plastics?
    If this is the same thing, the msds points out a problem or two.

    | SECTION 10 - STABILITY AND REACTIVITY |
    CONDITIONS TO AVOID: Heat, direct sunlight.
    Depending on what is was for, this could be a big problem.

    HAZARDOUS POLYMERIZATION: Could occur under normal conditions.
    Wonder what that means?

  3. #13
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    vac forming is very easy to do, you can get sheets of polystyrene from places like usplastics.com building a vacuum table big enough to do dash pieces would be tricky but could be done, the vac table i build is about 14x16 inches and works pretty good

  4. #14
    Constant Bitrate stapan's Avatar
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    Quote Originally Posted by remarque
    You can make the plastic part out of plastor, then use Castomold from www.usplastics.com and pour it over the mold. Once the Castomold has set simply remove the your plastor mold pour some Castolite in the mold from www.usplastics.com let that harden and you have a plastic part. You buy dye for the Castolite to make your part any color. Castomold is $19.17 for a quart and Castolite is $17.35 for quart. That to me was the simpliest and cheapest way to make plastic parts.
    I wonder if you could make a mold from the castomold and then use fiberglass on the inside instead of the castolite. this would give you the best of all worlds.

  5. #15
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    Quote Originally Posted by rotarypower101
    So I guess the next question would be how much and where can a guy get SLA work done?

    I can build cad files for exactly what I want in a matter of hours, where can someone just walk off the street and ask for work like this to be done?

    And how much does something like that roughly cost per geometry and size?
    http://www.rpdg.com/

    There are a few others.. you just upload your STL to this one and it will spit you out a quote.

    You can see the formats it can take, etc. Pricing looks pretty good and the people there were good to deal with.

    EDIT: http://www.protomold.com/ .. here is another one that I have had quote somethings

  6. #16
    Maximum Bitrate pRoFiT's Avatar
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    I wouldn't think you could get a SLA real cheap. The liquid is real expensive for you and me. A big company will save money only because they can build one part real quick and lock down a design before they have a mold made. I use SLA to create test fixtures for production. The guy that runs the machine told me its about $250,000 just to fill the machine up with the liquid plastic. The size parts you would be designing would probably cost around 100-200 dollars in material.

    I was going to make a new faceplate with SLA and then I was going to fiberglass over it to make it strong. Not sure about the bonding of the two materials. I guess I could start with a small junk piece first.

    Not sure if this helped anyone I'm kind of drugged right now and i might not make sense.

    One more thing: SLA parts need to be painted. It will harden with sunlight and become brittle if its not protected. Thin parts will warp if in sunlight also.
    Um, I guess this is where you put something witty.WITTY

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  7. #17
    Constant Bitrate reiner15's Avatar
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    very interesting stuff. i've been thinking about this too since I work as a Blowmold Technition. Blowing plastic is hard enough when having a couple million dollar machine, so my knowledge is quite useless if i want to make something other than a bottle lol. But i do have access to high density and polypropelene plastics... so if i were able to melt them down and somehow create a mold at home. However, first I would have to melt the plastic to 400 degrees, cast an aluminum mold and have the mold cooled.
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  8. #18
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    I've got a vacuum forming machine for sale if anyone is interested.

  9. #19
    Constant Bitrate rotarypower101's Avatar
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    Thanks for the links guys!
    Looks like these guys are fairly close to me.

    RPDG Pacific Northwest
    2 Lincoln
    10220 SW Greenburg Rd., Suite 200
    Portland, OR 97223
    Tel: (503) 313-9553
    Fax: (503) 296-2835

    Hopefully I can get in contact with one of their employees , I always have these little projects that could be better served using plastics, but the associated tooling requirements make it prohibitive when molding is required.

    Please keep the links and ideas coming if you guys would, as I am sure it will be useful for others and myself in the future.

    One thread I read about “Solvent adhesives... why don't more people use them?” Solvent adhesives... why don't more people use them?
    Might be useful for some.

  10. #20
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