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Old 01-21-2018, 07:37 PM   #51
vederstein
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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).

...Ved.


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Old Today, 12:35 AM   #52
WSMkid
 
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Quote:
Originally Posted by vederstein View Post
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.

Attachment 92985
Attachment 92986
Attachment 92991

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.)

Attachment 92988

Here's a video of the pour and breakdown.

http://www.youtube.com/watch?v=oRYpEzD8nVY

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.

Attachment 92989
Attachment 92990

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

...Ved.


Was your investment pre heated at the time of pour?

No personal experience but that seems to be a must to help prevent flashing.

Thank you for sharing.
Always following,

GJ




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