ʻO ka ʻāpana pōhaku Tricone IADC417 8 1/2″(215.9mm)

ʻO ka ʻāpana pōhaku Tricone IADC417 8.5" (215.9mm)
1>Nui ka nui o ka Bit 8.5"(215.9mm) me ka pilina kaula4 1/2 reg pin no ka ʻeli hohonu ʻana i ka luawai e like me ka ʻeli ʻana i ka luawai ʻaila a me ke kinoea, a he nui maʻamau nō hoʻi ia i ka ʻeli ʻana i ka lua pailota kuhikuhi ākea. Ua kapa pū mākou he 215mm a i ʻole 216mm. He tungsten carbide insert bit ia.
2> Loaʻa iā mākou ka bearing i hoʻopaʻa ʻia ʻo Elastomer me ke ʻano maʻamau a me ke kumukūʻai, a me ka bearing i hoʻopaʻa ʻia me ka maka Metal me ka hana kiʻekiʻe a me ke kumukūʻai.
3>Inā he ʻeli hohonu loa ia o ka luawai, kiʻekiʻe ka wikiwiki o ka wili, no laila ke kuhikuhi nei mākou i nā ʻāpana tricone paʻa metala i hoʻopaʻa ʻia ma ka hohonu o ka ʻeli ʻana ma mua o 1000 mika, no ka pōhaku paʻakikī a me ka ʻeli ʻana i ka lua hoʻokele ʻauwai lōʻihi i ʻoi aku ka lōʻihi ma mua o 300 mika ke paipai nei hoʻi mākou i nā ʻāpana tricone paʻa metala.
4>Inā he ʻeli ʻana i ka lua wai, ka ʻeli ʻana i ka lua pāpaʻu a i ʻole nā ​​​​papa hana ʻeli lua pilote no ka mamao pōkole, a laila ʻoi aku ka maikaʻi o ka hana kumukūʻai o nā ʻāpana tricone bearing elastomer (rubber).