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Investigation of optimum thrust, cutting speed, and water pressure for tungsten carbide and polycrystalline diamond compact roof-bolt drill bits.
Sundae-LS; Smeiser-TW; Howie-WL
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9574, 1995 Jan; :1-23
Laboratory tests were conducted at the U.S. Bureau of Mines to determine the effects of roof-bolt drilling parameters on penetration rate in sandstone using tungsten carbide alloy (WC-Co) and polycrystalline diamond compact (PDC) drill bits. During the tests, water pressure of 552 kPa was found to be adequate for removing the cuttings from the tops of the drill holes. Test results show that for both types of bits, penetration rate increased when thrust was raised from 227 to 1,588 kg. When water pressure rose from 554 plus or minus 120 to 1,344 plus or minus 350 kPa, the effect on penetration rate was not significantly different.
Diamond-bits; Carbide-tools; Water-pressure; Sandstones; Roof-bolts; Drill-bits; Mineral-industries
Report of Investigations
NTIS Accession No.
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9574