TROUBLE SHOOTING OF CASTINGS
1.
Excessive "fins"
A. Check initial setting time of refractory models and molds. (It should be no less than 15 minutes).
B. Raise centrifuge acceleration setting; this decreases take-off speed.
C. Decrease casting temperature 25°F (14°C).
2.
Short Castings
A. Lower centrifuge acceleration setting; this increases take-off speed.
B. Raise casting temperature 25°F (14°C).
C. Check burnout furnace temperature and soak time.
3.
Alloy Spillage
A. Too much alloy.
B. Crucible not properly aligned with mold sprue former.
C. Sprue former is too shallow.
D. Mold Holder too large for the mold.
E. Acceleration reducer setting too low.
4.
Too much slag left in crucible
A. Alloy temperature too low.
B. Alloy soak timer extended excessively.
C. Crucible not properly pre-heated prior to usage.
D. Crucible holder worn permitting bottom of crucible to swing out during acceleration.
Electromatic - 4
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