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Jim FLinchbaugh wrote:excellent results for try number 1!
AndersK wrote:Well done Jeff. That K looks super.
Did you cast more than one of the first part?
Making extra pieces to cut and check for porosity can avoid unpleasant surprises when machining.
Im not a pattern maker but for such thick part the gating looks a bit small. Or did you cut some of it away?
AndersK wrote:I have no hands on experience from the pouring but have been involved in a lot of casting development the past 20 years. Visited a foundry last week that just did the first samples of my latest project. The risers and ingot had almost the same volume as the actual parts.
The trick is to control the solidification so the gating remains liquid after the part solidifies. Lots of trial and error even for the pro's still.
Not unusual to have perfect outer shape (solidifies first normally) but inside can be like a Swiss cheese if gating is to small. Might not be critical with some porosity but the ones I work with must be pressure tight.
If you plan to powder coat you have to reduce porosity under the surface otherwise you can get blisters when part is heated.