Chaena ea boholo-holo, tšōmo ea Monna-moholo oa Lewatla ea Tsamaisang Lithaba e bontša moea o sa tsitsang oa mamello ka boiteko bo liehang le bo tsitsitseng.

Ha moloko oa batho o kena lekholong la bo18 la lilemo, Phetohelo ea Pele ea Liindasteri ha ea ka ea tlisa phetoho ea theknoloji feela empa hape e ile ea tlisa phetoho e khōlō sechabeng, e ileng ea qala nako eo ka eona mechine e ileng ea qala ho nkela mosebetsi oa matsoho sebaka. Ho tloha ka nako eo, indasteri ea ho cheka le ho epolla majoe e tsoetse pele ka potlako ho ea mekhoeng e potlakileng, e tšoarellang haholoanyane le e sebetsang hantle. Nakong ea ts'ebetso ena, mefuta e fapaneng ea likhoele bakeng sa likhokahano tsa melamu ea ho cheka, ho kenyeletsoa likhoele tse tloaelehileng tsa API le likhoele tsa trapezoidal tse bopehileng joaloka leqhubu.

Melao-motheo ea ts'ebetso ea likhoele tsena e fapane, e lebisang litlhoko tse fapaneng. Setsebi se seholo sa botekgeniki indastering ea ho cheka se buisane phatlalatsa ka likhoele tsa ho phunya li-roller-cone le lithupa tsa ho phunya hamore. Litlhaloso tse fanoeng li bohlokoa hoo ho boleloang hore li bohlokoa ho feta lilemo tse leshome tsa thuto.

Li-petroleum roller-cone bits li sebetsa ka ho bilika le ho pshatla mafika, ka lithupa tsa ho phunya li sebelisa likhoele tse tloaelehileng tsa API. Likhoele tsena li na le axial thrust feela, matla a torsional, le matla a mang a tšusumetso, ntle le ho fetisetsa matla a ts'usumetso 'meleng oa molamu. Likhoele tse tloaelehileng tsa API li etselitsoe haholo-holo ho hokahanya, ho tiisa le ho tiisa, e leng se bakang tšebeliso e fokolang ea matla le mocheso o feteletseng.

Ka lehlakoreng le leng, lithupa tsa hamore tse holimo hangata li sebelisa likhoele tse bōpehileng joaloka R kapa T. Matla a tsoang ho "hydraulic rock drill" a fetisoa ka molamu ho ea karolong ea ho phunya, e lebisang tahlehelong e kholo ea matla joaloka mocheso likhokahanong tsa likhoele, 'me mocheso o ka feta 400 ° C. Haeba likhoele tse tloaelehileng tsa API li ne li sebelisoa bakeng sa lithupa tse holimo tsa hamore, e ne e ke ke ea e-ba feela hore li ne li ke ke tsa sebetsa hantle phetisong ea matla, empa li ne li ka boela tsa hlokofatsoa ke khoholeho ea mobu, e leng ho etsang hore melamu ea boro e be thata ho qhaqhoa le ho ama haholo katleho ea kaho le litšenyehelo tse ntseng li eketseha.

Lilemong tsa bo-1970 le bo-80, liphuputso tse pharaletseng li ile tsa etsoa ke litsebi tsa linaha tse ling mabapi le likhoele tse sebelisoang holim'a lithupa tsa ho cheka hamore, ho nahanoa ka likhoele tse bōpehileng joaloka leqhubu, tse kopantsoeng, tse reverse serrated, FL, le trapezoidal. Ho ile ha etsoa qeto ea hore likhoele tse bōpehileng joaloka leqhubu li loketse lithupa tse nang le bophara ba 38 mm, ha likhoele tsa trapezoidal li loketse lithupa tse nang le bophara bo pakeng tsa 38 mm le 51 mm.

Lekholong la bo21 la lilemo, ka bophara bo ntseng bo eketseha ba likotoana tsa hamore tse holimo le lintlha tsa matla a metso ea likhoele, lik'hamphani tse fapaneng tsa lisebelisoa tsa ho cheka li hlahisitse mefuta e mecha ea likhoele tse kang SR, ST, le GT ka lipatlisiso le nts'etsopele e tsoelang pele.

Ka bokhuts'oane, nakong ea ts'ebetso ea ho cheka mafika, likhokahano tsa likhoele holim'a lithupa tsa hamore tse holimo ke tse ling tsa libaka tsa mantlha tsa tšebeliso ea matla le ntlha e kholo ea ho hloleha ha lere la ho phunya pele.

Joalokaha Bobuddha bo ruta, "tšimoloho e itšetlehileng ka eona ha e na letho, 'me motho ha aa lokela ho khomarela mokhoa leha e le ofe o le mong." Ka tsoelopele e ntseng e tsoela pele ea mahlale le thekenoloji, ho bohlokoa ho nahanisisa hore na mefuta ea likhoele e sebelisoang hajoale ke tharollo e molemohali le ea ho qetela bakeng sa likhokahano indastering ea ho cheka ha haeteroliki.