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Casting Aluminum help please.

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FLOPGUY:
Hello,
I am trying to cast aluminum. I am very new at this so pardon the simplicity on my knowledge.

I made a Furnace out of cynder blocks, I made a wire rack to hold the crucible out of 1/2' rebar.

I used a metal can as a crucible. I used a propane weed torch as the burned (instructions said it can achieve 3000 deg.)

I tried to do lost foam casting. I tried to cast a crank handle. I put the foam in my sand casting box. I melted my aluminum, but I notice as I was pooring that It seems to get almost a skin layer as I pour and it did not fill the entire foam.

I almost think that I am not getting the aluminum hot enough or am I doing something else wrong?

Thank you,
Mike

Rob.Wilson:
Hi Mike

--- Quote from: FLOPGUY on July 19, 2011, 04:51:37 PM ---I melted my aluminum, but I notice as I was pooring that It seems to get almost a skin layer as I pour and it did not fill the entire foam.

I almost think that I am not getting the aluminum hot enough or am I doing something else wrong?

Thank you,
Mike

--- End quote ---
Sounds like you answered your own question  :med:  ,,,,,,,,,,, probably not hot enough  :thumbup:  ,,, If you have a thin walled can it will loose heat quickly .

More heat ,, thicker pot  :dremel:



Rob 

Chazz:
Also, did you 'skim' the surface just prior to the pour?

Chazz

dmbasher:
I believe that industry melts out the foam before casting. Use anti - gassing tablets so you dont get a casting looking like Swiss cheese. At least use a thick steel pot or better, a proper crucible and make sure you have more than enough molten metal to do the job.Good luck.

FLOPGUY:

--- Quote from: Chazz on July 19, 2011, 05:16:43 PM ---Also, did you 'skim' the surface just prior to the pour?

Chazz

--- End quote ---

I did pretty much, but I went fast because I was affraid of it cooling down

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