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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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