Instructables

Mold Making - Mass Casting Complex Parts (with a parting line)

video 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
can you cast aluminum in these molds

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

Cartmanpimp5 years ago
Can you make a mold of a whole tree of a model?
Renagade5 years ago
Very cool. I have a question though, can you pour liquid plastic into these molds and harden the same way?
Myself6 years ago
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!
Ward_Nox Myself6 years ago
well now your not
valkiraun6 years ago
the plywood base could be replaced withclay, which is malleable and secure. Great instructable. 5*
Every time I've tried to order products from this company I get nothing but silence.
TangMu6 years ago
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!!
wow, neat videos... posting a lot of stuff eh?