Q.

During mould making by wire cut EDM, it is important to harden              to counter the effects of changes in the shape of the workpiece due to heat treatment.

A. the insert
B. electrode wire
C. electrode holding coils
D. bolting points in the workpiece
Answer» A. the insert
Explanation: it is important to harden the insert or mould plate steel before making the tightly tolerated ends in the ejector pin holes because the heat treatment tends to change the workpiece shapes at a certain degree.
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