Gallery, Projects and General > How do I??

Do you have a press?

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Manxmodder:
I looks very much like the sink mark is caused by not having a large enough reservoir of metal above the sprue....OZ.

NormanV:
I am sure that you are right Oz, I did consider building up the sand on top to make the sprue longer to prevent shrinkage happening but decided that it did not matter. In fact I had contemplated making the pattern with a slot down the middle similar to the long casting that I made but thought that it just made one more thing to go wrong. Anyway, I want to build in lots of  mass in order to make it as rigid as possible. I plan to fill the centre with epoxy and mineral filler.
 

awemawson:
Norman,

Your alloy sample checks out as follows:

Aluminium :  90.40%
Silicon :         7.57%
Iron :            0.33%
Copper :       0.28%
Manganese : 0.02%
Magnesium : 1.19%
Chromium :   0.00%
Zinc :            0.01%
Lead :          0.00%
Lithium :       0.00%

Nearest commercial alloy to that is LM25

NormanV:
Thank you Andrew.

Pete W.:

--- Quote from: awemawson on February 27, 2014, 09:36:01 AM ---Norman,

Your alloy sample checks out as follows:

Aluminium :  90.40%
Silicon :         7.57%
Iron :            0.33%
Copper :       0.28%
Manganese : 0.02%
Magnesium : 1.19%
Chromium :   0.00%
Zinc :            0.01%
Lead :          0.00%
Lithium :       0.00%

Nearest commercial alloy to that is LM25

--- End quote ---

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