missing sprues

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 I’m a newbie to lost wax casting.  My biggest problem is “missing sprues”.  As shown in the photo, one sprue was lost on this brass casting.  I have had similar problems on several occasions, resulting in incomplete castings.  This item was cast using vacuum assist.  It was cast in a 2 ½ x 3 flask.  I used Kerr Satin Cast for the investment material.  The flask temperature was 1100 degrees F and the pouring temperature was 2000 degrees F.  Other castings came out OK.   Help will be appreciated.  Thanks.Missing Sprues: I’m a newbie to lost wax casting. My biggest problem is “missing sprues”. As shown in the photo, one sprue was lost on this brass casting. I have had similar problems on several occasions, resulting in incomplete castings. This item was cast using vacuum assist. It was cast in a 2 ½ x 3 flask. I used Kerr Satin Cast for the investment material. The flask temperature was 1100 degrees F and the pouring temperature was 2000 degrees F. Other castings came out OK. Help will be appreciated. Thanks.
rayj


ScottTheSculptor's picture

air

this is much smaller than what I usually work with, but.
I alway give a path for the displaced air to leave the mold as the metal enters.
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