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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 --- :clap: :nrocks: :clap: :nrocks: :clap: :nrocks: :clap: :nrocks: :clap: :nrocks: :clap: :nrocks: |
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