42755Re: Need advice
- Apr 10, 2013Just a side thought:
Did you de-gass before the pour?
--- In firstname.lastname@example.org, "crashbone256" <wheezer606@...> wrote:
> I made the mold from eps. I taped the edges with masking tape.
> I encased the mold in POP. The mold was oven dried at 170 F for 12 hours.
> Then 8 hours at 200 F. Acetone was poured into the mold the dissolve the
> styrofoam. The mold was dried at 210 F for 3 hours. The 200F molds were buried in new dry sand to near the top.
> 5 # Al muffins were melted in a 10 # crucible. The crux was red hot when removed.
> As the Al melt was poured into the "empty" mold it bubbled and popped and blew
> bubbles up through the sprue. A steady stream was being poured, but it didn't want to go down the sprue.
> You can see from the first picture how it was gated.
> Sprued on the top, Al runs down into the mold and rises off the bottom.
> The casting is porous and crappy.
> What to do next time?
- << Previous post in topic Next post in topic >>