Hana ʻia ka pōhaku pōhaku e like me ke kumumanaʻo o ka hopena hopena.I ka hana ʻana, hana ka piston i ka neʻe kiʻekiʻe-frequency reciprocating motion, hoʻopilikia mau i ka shank.Ma lalo o ka hana a ka ikaika o ka hopena, ua ʻoki ʻia ke ʻano drill bit i ka pōhaku a ʻokiʻoki i loko o kahi hohonu, e hana ana ...
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