Evaluation of water-jet-assisted drilling with handheld drills

Details

• Personal Author:
  Kovscek, Paul D. ; Taylor, Charles D. ; Thimons, Edward D.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  "The Bureau of Mines has tested a low-thrust water-jet-assisted rotary drill. This work was performed to evaluate the performance of a water-jet-assisted drill operated at thrust levels typical of a handheld manual-thrust operation. Prior work by the Bureau had indicated that using water-jet-assist with high-thrust drilling applications would increase drilling rate. Small-diameter holes were drilled in five different types of rock. Thrust and water pressure were varied as the drill rate was monitored. The test results indicate that drilling rates increase with increasing water pressure and thrust. The water jet has more effect on reducing the specific energy when drilling in the harder rocks than in softer rocks. Variation in drill rate for a given rock sample is attributable primarily to the material heterogeneity within the sample. One rock type (Greenwich sandstone) could not be drilled efficiently with the water-jet-assisted drill." - NIOSHTIC-2
  
  NIOSHTIC no. 10006098
  
  
• 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:
  20 numbered pages
• NIOSHTIC Number:
  nn:10006098
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9c60105e2806f094ef845ca58f3240a5a5354126a18ca89ff1f8dfa9a8d5c856f26d317457c5a38ebf2518c2b2d6db42a838e2ce19d1fcc75221f1e75fb639c5
• Download URL:
  https://stacks.cdc.gov/view/cdc/10478/cdc_10478_DS1.pdf
• File Type:
  [PDF - 9.15 MB ]