CASTING PROBLEMS

NON OR PARTIAL FILL

NON OR PARTIAL FILL

Possible Fault CauseSolution
Metal temperature incorrectIncrease metal temperature first before increasing the flask temperature (see burnout section).
Flask temperature incorrectIncrease flask temperature (see burnout section).
Incorrect feed/sprue systemFeed or gate should be attached to the thickest part of the casting. It should be at least 25% of the thickness of the casting.
Insufficient centrifugal forceIncrease torque first and then RPM of the centrifugal casting machine. Only increase by small amounts each time (5%).
Low vacuum when vacuum castingChange oil in pump on a regular basis. Check seals for blockages in the vacuum pipes.
Not enough over pressureOnly increase over pressure by small amounts each time (5%).