Sisteme ea "Drill symmetric/Concentric drilling" e etselitsoe ho phunya le ho phunya lesoba ka nako e le 'ngoe maemong a sa tsitsang a fatše. Sekhechana sa mokhanni se kentsoeng ka selikalikoe se khotsofatsang kapa selikalikoe se ka sebelisoang hape se etsa moralo o felletseng oa sefahleho o ntlafatsang haholo sekhahla sa ho kenella le ho otloloha ha lesoba la ho phunya. Li-grooves tsa ka hare tsa ho phunya hammoho le lieta tse hahiloeng ka har'a casing li fana ka tiiso e ntle ho konopo ea lesoba la ho phunya, 'me kahoo e fokotsa tšitiso ea ho potoloha ha lesoba la ho phunya.
Sebaka sa Kopo:E loketse ho cheka liliba tsa metsi, liliba tsa mocheso oa mocheso, li-miscopies tse khutšoane, lesoba la moaho la mofuta o monyane oa moaho, projeke ea letamo le boema-kepe.
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