API no nā ʻāpana drill i hoʻopilikino ʻia IADC126 5 1/4 iniha (133mm) no ka pōhaku paʻa.

Ma muli o ka mea ʻokiʻoki, hiki ke hoʻokaʻawale ʻia nā ʻāpana tri-cone i nā ʻāpana TCI a me nā ʻāpana niho kila.
Kūpono ʻo TCI IADC126 no nā ʻano palupalu. He mea nui loa ke koho ʻana i ka bit rock drill ma mua o ka hoʻomaka ʻana i ka papahana.
Hiki ke hoʻokaʻawale ʻia ka paʻakikī o nā pōhaku ma ke ʻano he palupalu, waena, paʻakikī a paʻakikī loa paha, a ʻokoʻa paha lākou i ka paʻakikī no ka pōhaku hoʻokahi, no ka laʻana, ʻo ka limestone, ke one a me ka shale he mau limestone palupalu, limestone waena a me nā limestone paʻa, pōhaku lime a me pōhaku one paʻakikī, etc.
Me 15 mau makahiki a ʻoi aku ma mua o 30 mau ʻāina o ka ʻike lawelawe i ka ʻenekinia wili, ua hāʻawi ʻo Far East i nā drill bits a me nā ʻuhane drilling holomua no nā mea kūʻai aku he nui, nā noi like ʻole. Hoʻopili kēia i ka ʻaila hinu, gas, ʻimi geological, dredging, mining, water well drilling, HDD, kūkulu a me ke kumu.
Inā hiki iā ʻoe ke hāʻawi i ka ʻike kikoʻī, e like me ka paʻakikī o ka pōhaku, ke ʻano o ka rig drilling, ka wikiwiki o ka rotation, ke kaumaha a me ka torque o ka bit, hiki iā mākou ke hāʻawi iā ʻoe i ka hopena kūʻokoʻa a ka ʻenekinia. Ke haʻi mai ʻoe iā mākou e pili ana i ka wili kūpaʻa, ka wili ʻana i ka pae, ka luawai ʻaila, ka ʻeli ʻana ʻole a i ʻole ka hoʻokumu ʻana i ke kahua, kōkua pū kekahi iā mākou e ʻimi i ka bit drill kūpono iā ʻoe.