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Helical drilling |
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|  | Unlike trepanning, helical drilling does
not involve the creation of a pilot hole. Right from the start,
the laser begins moving in circles over the material as the
pulses are delivered, with a large amount of material shooting
upward in the process. The laser continues to work its
way through the hole in a downward spiral. The focus, meanwhile,
can be adjusted so that it is always at the base of the
hole. Once the laser has pierced through the material, it can
complete a few more revolutions to enlarge the base of the
hole and smooth out the edges. Helical drilling makes it possible
to produce very large and deep high-quality holes. |
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