____________________ laser drilling is a method used to remove a cylindrical Core, or circular disc from a substrate.(a) Trepanning(b) Percussion(c) Pulsating(d) CarbonicThis 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

____________________ laser drilling is a method used to remove a cylin

1.	____________________ laser drilling is a method used to remove a cylindrical Core, or circular disc from a substrate.(a) Trepanning(b) Percussion(c) Pulsating(d) CarbonicThis 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
Answer» 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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