▁is ▁based ▁on ▁rot ating ▁a ▁cutting ▁tool ▁around ▁its ▁own ▁axis ▁and ▁simultaneously ▁about ▁a ▁centre ▁axis ▁which ▁is ▁off - set ▁from ▁the ▁axis ▁of ▁the ▁cutting ▁tool . ▁The ▁cutting ▁tool ▁can ▁then ▁be ▁moved ▁simultaneously ▁in ▁an ▁ax ial ▁direction ▁to ▁dr ill ▁or ▁machine ▁a ▁hole ▁– ▁and / or ▁combined ▁with ▁an ▁arbitrary ▁side wards ▁motion ▁to ▁machine ▁an ▁opening ▁or ▁cav ity . ▁ ▁By ▁adjust ing ▁the ▁offset , ▁a ▁cutting ▁tool ▁of ▁a ▁specific ▁diameter ▁can ▁be ▁used ▁to ▁dr ill ▁holes ▁of ▁different ▁diam eters ▁as ▁illustrated . ▁This ▁implies ▁that ▁the ▁cutting ▁tool ▁invent ory ▁can ▁be ▁substantial ly ▁reduced . ▁ ▁The ▁term ▁orb ital ▁dr illing ▁comes ▁from ▁that ▁the ▁cutting ▁tool ▁“ orb its ” ▁around ▁the ▁hole ▁center . ▁The ▁mechan ically ▁forced , ▁dynamic ▁offset ▁in ▁orb ital ▁dr illing ▁has ▁several ▁advantages ▁compared ▁to ▁conventional ▁dr illing ▁that ▁dr ast ically ▁increases ▁the ▁hole ▁precision . ▁The ▁lower ▁thrust ▁force ▁results ▁in ▁a ▁b urr - less ▁hole ▁when ▁dr illing ▁in ▁met als . ▁When ▁dr illing ▁in ▁composite ▁materials ▁the ▁problem ▁with ▁del am ination ▁is ▁elimin ated . ▁ ▁Material ▁ ▁Dr illing ▁in ▁metal ▁▁ ▁Under ▁normal ▁usage , ▁sw arf ▁is ▁carried ▁up ▁and ▁away ▁from ▁the ▁tip ▁of ▁the ▁dr ill ▁bit ▁by ▁the ▁fl uting ▁of ▁the ▁dr ill ▁bit . ▁The ▁cutting ▁edges ▁produce ▁more ▁ch ips ▁which ▁continue ▁the ▁movement ▁of ▁the ▁ch ips ▁out wards ▁from