Q.

What is the maximum value of drilling depth in trepanning method of laser drilling process?

A. 1.7 mm
B. 4.3 mm
C. 6.4 mm
D. 7.9 mm
Answer» C. 6.4 mm
Explanation: the depth increases when we use a trepanning method for laser drilling process and that is about 6.40 mm.
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