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Which type of laser can be used for direct drilling or percussion?

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in Advanced Machining by (962k points)
Which type of laser can be used for direct drilling or percussion?

(a) Ruby laser

(b) Nd-YAG laser

(c) Ruby & Nd-YAG laser

(d) None of the mentioned

The question was posed to me in an interview.

This key question is from LBM-Applications in section Thermal Processes of Advanced Machining

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Best answer
The correct option is (c) Ruby & Nd-YAG laser

The explanation is: Both Ruby and Nd-YAG laser can be used for direct (percussion) drilling purpose.

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