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Preliminary Evaluation of the Relationship of Bit Wear to Cutting Distance, Forces, and Dust Using Selected Commercial and Experimental Coal- and Rock-Cutting Tools.

PB90269184

Publication Date	1988
Personal Author	Plis, M. N.; Wingquist, C. F.; Roepke, W. W.
Page Count	72
Abstract	The report describes the initial results of long-range research on bit life conducted by the Bureau of Mines. Three commercial bit designs--a round-nose radial, 60 deg conical, and 90 deg conical with tungsten carbide (WC) inserts--and five experimental bits were tested. Four of the experimental bits were radial designs using polycrystalline diamond compact (PDC) inserts. The fifth was a 90 deg conical with an oversize WC insert. Bits were worn on a high-silica sandstone typical of coal mine roofs. The bits were mounted on a 34-in-diam drum section that provided a bit speed of 565 ft/min. Cutting forces were measured on a modified vertical slotter using a three-axis force dynamometer and recorded on an FM magnetic tape recorder. Changes in cutting forces, bit weight, and airborne dust due to gradual abrasive wear and catastrophic insert failure are presented. Tabulated and graphed data, photographs of the progression of bit wear, and selected qualitative visual and auditory observations of the bits taken throughout the experiment are found in the appendixes.
Keywords	Mining equipment Cutting tools Tool life Wear Rotary drill bits Rock drills Coal mining Force Dust Distance Mining engineering
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 41J - Tooling, Machinery, & Tools 94F - Tooling, Machinery, & Tools
Corporate Authors	Bureau of Mines, Twin Cities, MN. Twin Cities Research Center.
Supplemental Notes	Library of Congress catalog card no. 88-600143.
Document Type	Technical Report
Title Note	Rept. of investigations/1988.
NTIS Issue Number	199023

Preliminary Evaluation of the Relationship of Bit Wear to Cutting Distance, Forces, and Dust Using Selected Commercial and Experimental Coal- and Rock-Cutting Tools.

Preliminary Evaluation of the Relationship of Bit Wear to Cutting Distance, Forces, and Dust Using Selected Commercial and Experimental Coal- and Rock-Cutting Tools.
PB90269184

Publication Date	1988
Personal Author	Plis, M. N.; Wingquist, C. F.; Roepke, W. W.
Page Count	72
Abstract	The report describes the initial results of long-range research on bit life conducted by the Bureau of Mines. Three commercial bit designs--a round-nose radial, 60 deg conical, and 90 deg conical with tungsten carbide (WC) inserts--and five experimental bits were tested. Four of the experimental bits were radial designs using polycrystalline diamond compact (PDC) inserts. The fifth was a 90 deg conical with an oversize WC insert. Bits were worn on a high-silica sandstone typical of coal mine roofs. The bits were mounted on a 34-in-diam drum section that provided a bit speed of 565 ft/min. Cutting forces were measured on a modified vertical slotter using a three-axis force dynamometer and recorded on an FM magnetic tape recorder. Changes in cutting forces, bit weight, and airborne dust due to gradual abrasive wear and catastrophic insert failure are presented. Tabulated and graphed data, photographs of the progression of bit wear, and selected qualitative visual and auditory observations of the bits taken throughout the experiment are found in the appendixes.
Keywords	Mining equipment Cutting tools Tool life Wear Rotary drill bits Rock drills Coal mining Force Dust Distance Mining engineering
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 41J - Tooling, Machinery, & Tools 94F - Tooling, Machinery, & Tools
Corporate Authors	Bureau of Mines, Twin Cities, MN. Twin Cities Research Center.
Supplemental Notes	Library of Congress catalog card no. 88-600143.
Document Type	Technical Report
Title Note	Rept. of investigations/1988.
NTIS Issue Number	199023