Well done, the aluminum from the motor rotors is not one I would prefer using.
My favorites are aluminum rims, engine and transmission scrap.
If you really want to produce some really nice castings source out Petrobond sand. it is so fine you can capture a finder print. Also you might want to ditch that steel crucible for a silicon carbide one.
Believe it or not the steel from that crucible is contaminating your aluminum. Aluminum which has other unwanted metals could give better pouring quality's but probably the opposite will happen where the quality depreciates.
Bad aluminum could freeze before filling the mold, become brittle and break like glass at the slightest bump.
I had a bunch of silver solder used for refrigeration that came in sticks, for an experiment added a stick to my aluminum melt. The finished casting came out fine but very brittle.
If it hadn't been brittle the one quality it did have ( tone ) would have made it a perfect alloy for casting a large bell.
Fishing weight mold.
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