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Home Model Engine Machinist > Building Them > Engines From Castings > Rudy Kouhoupt's Open Column Steam Engine - Cast & Double Size

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Old Yesterday, 07:37 PM   #51
Must do dumb things....
vederstein's Avatar
Join Date: Feb 2011
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Today I did the burnout and aluminum pour of the posts.

The burnout went fairly well. I placed the cured investment in the furnace upside down. The burn started at a low fire for 30 minutes then I jacked it up to a roaring burn for about an hour.

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I noticed that the investment didn't fully fill the below the mold, but I forged ahead anyway embedding the investment into sand after blowing it out with compressed air. (The black bars are from the pieces of steel roundstock I had under the investment to let the heat in.)

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Here's a video of the pour and breakdown.

As you can see, I had not a useable part out of the four posts. I guess I should pour one at a time. Perhaps a taller sprue? Perhaps a mold that fills from the bottom with an air vent to the top? I welcome comments and insight.

On the plus side, where the casting did come out well, it was so well defined I could see the layers from the 3D print.

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On the other hand, perhaps I should start modelling ruins from the Classical Age (ancient Greece & Rome).


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