Ko te bit drag bit he moka wiri i te nuinga o te wa i hangaia hei whakamahi i nga hanganga ngawari penei i te onepu, te uku, etahi toka ngawari ranei.Heoi, e kore e pai te mahi i roto i nga kirikiri kirikiri, i nga toka pakari ranei.Ko nga whakamahinga ko te keri poka wai, te keri, te waiariki.taiao me te keri keri.I nga wa katoa ka taea, me whakamahi ki te keri i nga rua pairati na te mea ka puta nga haea e ngawari ana ki te tarai.
3 nga parirau toia moka he wahi hanga kotahi o te koranu rino whakarewa me nga tohutohu tapahi tungsten carbide me nga taha ine kia roa ake te ora.E 3 ona parirau, e 3 nga kohao rewharewha.Ka whakatauritea ki nga parirau e 4, he tere ake, he pukuriri hoki te wiri o nga moka toia o nga parirau e 3, engari he poto ake te roa, he iti ake te roa.Me noho te tere tepu hurihuri o nga paraka toia i waenga i te 60 me te 80 rpm me te taumahatanga o te moka (WOB).
3 nga parirau toia parapara he taputapu ohaoha ina keri ana i nga hanganga whenua ngawari me te hohonutanga o te papaku, he mea hanga tuatahi mo nga hangahanga reo ngawari, penei i te Uku, Loam, Silt, Te nuinga o te oneone ngawari-ki-te-waenga he makuku, me etahi atu. e tūtohutia ana mo te keri i roto i te Maina, Te Tirohanga, te Taiao, te puna wai, te Geo Exchange, etc.
Tuhipoka: Ko te diameter me te miro i whakaatuhia i runga ake nei ko te rahi o te rahi, kei te waatea etahi atu rahi i runga i te tono.
Rahi miro: 2 3/8'' API Reg, 2 7/8'' API Reg, 3 1/2'' API Reg, 4 1/2'' API Reg, 6 5/8'' API Reg, 2' ' API IF, 2 3/8'' API IF, 2 7/8'' API IF, A Rod, N Rod, AW, BW, NW, AWJ, BWJ, NWJ.
| Moka Diamita | |||||
| (Inihi) | (mm) | (Inihi) | (mm) | (Inihi) | (mm) |
| 3 1/2" | 88.9 mm | 6 1/8" | 155.6mm | 8 7/8" | 225.4mm |
| 3 5/8" | 92.1 mm | 6 1/4" | 158.8mm | 9" | 228.6mm |
| 3 3/4" | 95.3 mm | 6 1/2" | 165.1mm | 9 1/8" | 231.8mm |
| 3 7/8" | 98.4 mm | 6 5/8" | 168.3mm | 9 1/4" | 235.0mm |
| 4" | 101.6 mm | 6 3/4" | 171.5mm | 9 1/2" | 241.3mm |
| 4 1/8" | 104.8 mm | 6 7/8" | 174.6mm | 9 5/8" | 244.5mm |
| 4 1/4" | 108.0 mm | 7" | 177.8mm | 9 3/4" | 247.7mm |
| 4 1/2" | 114.3 mm | 7 1/8" | 181.0mm | 9 7/8" | 250.8mm |
| 4 5/8" | 117.5 mm | 7 1/4" | 184.2mm | 10" | 254.0mm |
| 4 3/4" | 120.7mm | 7 3/8" | 187.3mm | 10 5/8" | 269.9mm |
| 4 7/8" | 123.8mm | 7 1/2" | 190.5mm | 11 1/2" | 292.1mm |
| 5" | 127.0mm | 7 5/8" | 193.7mm | 12" | 304.8mm |
| 5 1/8" | 130.2mm | 7 3/4" | 196.9mm | 12 1/4" | 311.2mm |
| 5 1/4" | 133.4mm | 7 7/8" | 200.0mm | 12 1/2" | 317.5mm |
| 5 3/8" | 136.5mm | 8" | 203.2mm | 13 3/4" | 349.3mm |
| 5 1/2" | 139.7mm | 8 1/8" | 206.4mm | 14" | 355.6mm |
| 5 5/8" | 142.9mm | 8 1/4" | 209.6mm | 14 3/4" | 374.7mm |
| 5 3/4" | 146.1mm | 8 1/2" | 215.9mm | 15" | 381.0mm |
| 5 7/8" | 149.2mm | 8 5/8" | 219.1mm | 15 3/4" | 400.1mm |
| 6" | 152.4mm | 8 3/4" | 222.3mm | 17 1/2" | 444.5mm |
Tōia ngā pōkai moka
| Rahi ota iti | N/A |
| Utu | |
| Nga Taipitopito mokete | Paerewa Kaweake Tukunga Paerewa |
| Wā Tukunga | 7ra |
| Nga tikanga utu | T/T |
| Te kaha tuku | I runga i te Ota Taipitopito |
