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x Coal-cutting Bits -- Testing.
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  • x
    Coal-cutting bits -- Testing. (8)
  • Testing modified coal-cutting bit designs for reduced energy, dust, and incendivity
    Filetype[PDF - 16.30 MB]
    Personal Author:
    Roepke, Wallace W. ; Hanson, Bruce D. ;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1983
    Series:
    Report of investigations (United States. Bureau of Mines) ; 8801
    Description:
    "Four bit designs, two conical and two radial, were tested in coal against a 60 deg. Conical reference bit to obtain data on orthogonal cutting forces...
    File Type:
    Filetype[PDF - 16.30 MB]
    File Type:
    Filetype[PDF - 16.30 MB]
  • Effects of water on coal cutting forces and primary dust distribution
    Filetype[PDF - 900.25 KB]
    Personal Author:
    Roepke, Wallace W. ; Myren, Theodore A. ;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1985
    Series:
    Report of investigations (United States. Bureau of Mines) ; 8993
    Description:
    "Research to evaluate the lubricity effects achieved by spraying water on the cutting bit of a mining machine or spraying water on the coal during cut...
    File Type:
    Filetype[PDF - 900.25 KB]
    File Type:
    Filetype[PDF - 900.25 KB]
  • Use of an in-seam tester to determine effects of bit type on primary dust generation
    Filetype[PDF - 7.23 MB]
    Personal Author:
    Sundae, Laxman S.
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1989
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9263
    Description:
    "A U.S. Bureau of Mines designed and fabricated in-seam tester, retrofitted with a dust shroud, was used to establish a respirable dust index (rdi) an...
    File Type:
    Filetype[PDF - 7.23 MB]
    File Type:
    Filetype[PDF - 7.23 MB]
  • Preliminary evaluation of the relationship of bit wear to cutting distance, forces, and dust using selected commercial and experimental coal- and rock-cutting tools
    Filetype[PDF - 27.82 MB]
    Personal Author:
    Plis, Matthew N. ; Wingquist, Carl F. ; ...
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1988
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9193
    Description:
    "This report describes the initial results of long-range research on bit life conducted by the Bureau of Mines. 3 Commercial bit designs- -a round-nos...
    File Type:
    Filetype[PDF - 27.82 MB]
    File Type:
    Filetype[PDF - 27.82 MB]
  • Reduction in frictional ignition due to conical coal-cutting bits
    Filetype[PDF - 5.60 MB]
    Personal Author:
    Cheng, Lung. ; Furno, A. L. (Aldo L.) ; ...
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1987
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9134
    Description:
    "The Bureau of Mines conducted laboratory tests to investigate the ease of frictional ignition with frozen (nonrotating) conical bits cutting into san...
    File Type:
    Filetype[PDF - 5.60 MB]
    File Type:
    Filetype[PDF - 5.60 MB]
  • Frictional ignition of natural gas-air mixtures by alternative coal-cutter bit shank materials
    Filetype[PDF - 3.97 MB]
    Personal Author:
    McDonald, L. Garner
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1992
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9417
    Description:
    "The U.S. Bureau of Mines tangentially impacted potential coal-cutter bit shank materials against sandstone to investigate the potential of the materi...
    File Type:
    Filetype[PDF - 3.97 MB]
    File Type:
    Filetype[PDF - 3.97 MB]
  • In situ comparison of radial and point-attack bits
    Filetype[PDF - 7.99 MB]
    Personal Author:
    Sundae, Laxman S. ; Myren, Theodore A. ;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1987
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9127
    Description:
    "The Bureau of Mines conducted a series of tests to compare the cutting forces required by radial and point-attack bits when making similar cuts. Thre...
    File Type:
    Filetype[PDF - 7.99 MB]
    File Type:
    Filetype[PDF - 7.99 MB]
  • Coal cutting forces and primary dust generation using radial gage cutters
    Filetype[PDF - 13.44 MB]
    Personal Author:
    Roepke, Wallace W. ; Voltz, Jon I. ;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1983
    Series:
    Report of investigations (United States. Bureau of Mines) ; 8800
    Description:
    "The Bureau of Mines determined coal-cutting forces and primary dust generation of four styles of radial gage bits as used on end rings of continuous ...
    File Type:
    Filetype[PDF - 13.44 MB]
    File Type:
    Filetype[PDF - 13.44 MB]