Mold Making - Mass Casting Complex Parts (with a Parting Line)

When mass casting a part without a flat side, you must create a two-part mold. We create a two-part silicone rubber mold with a clean parting line and then cast the part with Repro.

To see other mold making videos see http://www.freemansupply.com/moldmaking.htm

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Be the First to Share

    Recommendations

    • Made with Math Contest

      Made with Math Contest
    • Cardboard Speed Challenge

      Cardboard Speed Challenge
    • Multi-Discipline Contest

      Multi-Discipline Contest

    11 Discussions

    use this mold to make a wax copy of your part then use the wax copy in a sand mold. the hot aluminum boils away the wax and takes its shape

    I think you're supposed to pour plaster to make metal castings, this plastic might melt. but you should be able to use same process, just swap out the polymer with plaster

    0
    None
    Renagade

    10 years ago on Introduction

    Very cool. I have a question though, can you pour liquid plastic into these molds and harden the same way?

    0
    None
    Myself

    11 years ago on Introduction

    Nice clear overview of the moldmaking and casting process! I'd like to see it with an even more complex shape, one that didn't lend itself easily to the wood baseplate method. Also, I can't be the only one who heard "spray-on vaseilne" and immediately started thinking up prank uses for that stuff. To be in high school again!

    1 reply
    0
    None
    valkiraun

    11 years ago on Introduction

    the plywood base could be replaced withclay, which is malleable and secure. Great instructable. 5*

    0
    None
    liquidflorian

    11 years ago on Introduction

    Every time I've tried to order products from this company I get nothing but silence.

    0
    None
    TangMu

    11 years ago on Introduction

    using plasticine instead of milled wood also kinda works for the parting line. just poke dimples in it for the locking mechanism. More ghetto but less time consuming. I love that fact you are wearing lab coats in all of this. It reeks of SCIENCE!!