The interlocking pattern and alignment teeth on the cope and drags are there to ensure:

Question

Accepted Answer

The cavity in the sand in the cope and drag matches up to to form the intended geometry.

Answer

That the pattern can be easily taken out of the sand without damaging the cavity in the sand.

Answer

The cope and drag are clamped together securely during the pouring of the molten metal.

Answer

The desired cavity in the final castings are formed

Answer

There is adequate material to fill the cavity during the cooling and solidification of the molten metal.

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