Novel coal-cutting bits and their wear resistances

Details

• Personal Author:
  Cheng, Lung
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  "Based on earlier tests that showed steel to be much more likely to cause frictional ignition than tungsten carbide, the Bureau of Mines redesigned coal-cutting bits to reduce the hazard of face ignitions. Two bit designs--a mushroom-shaped bit with a conical shank and a dovetail bit with a rectangular shank--are described, as well as bit wear tests conducted in the laboratory and in an operating coal mine. In laboratory tests, for 1/8-, 1/4,- and 1/2-in-deep cuts and cutting speeds of 280, 500, and 660 ft/min, the mushroom bit had significantly longer tip wear life than the conventional bit
  
  the dovetail bit was also superior to the conventional bit. Results of in-mine tests on the mushroom bit agreee well with laboratory results. In-mine tests of the dovetail bit are underway." - NIOSHTIC-2
  
  NIOSHTIC no. 10003009
  
  
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  15 numbered pages
• NIOSHTIC Number:
  nn:10003009
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:eb1ff34a61dd94fb828086713cbb8843fb03b8b768b2b957c3a437b246867c0e9b5c34ee005ef94a08bdf4a0ace66f126969011034f19e80121c3a8a53afb89d
• Download URL:
  https://stacks.cdc.gov/view/cdc/10613/cdc_10613_DS1.pdf
• File Type:
  [PDF - 7.10 MB ]