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Metal Casting
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A gating ratio of 1 : 2 : 4 is used to design the gating system for magnesium alloy casting. This gating ratio refers to the cross-section areas of the various gating elements as given below:
1. Down sprue
2. Runner bar
3. Ingates
The correct sequence of the above elements in the ratio 1 : 2 : 4 is: