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____________________ laser drilling is a method used to remove a cylindrical Core, or circular disc from a substrate.

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____________________ laser drilling is a method used to remove a cylindrical Core, or circular disc from a substrate.

(a) Trepanning

(b) Percussion

(c) Pulsating

(d) Carbonic

This question was posed to me in an international level competition.

This key question is from Drilling and Road Making Equipments topic in chapter Construction Equipments of Construction & Building Materials

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Right choice is (a) Trepanning

The best explanation: Unlike percussion laser drilling, the position of the beam or substrate is moved in conjunction with a predetermined laser beam overlap to achieve the desired edge quality and production through out. Less overlap trepanning laser drilling increases through out but produces more jagged edge quality.

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