Results 1 - 10 of 39

• Field Evaluation of Air-blocking Shelf for Dust Control on Blasthole Drills
  3/1/2011 - Peer reviewed journal articles
  Field tests confirm that an air-blocking shelf installed in the inside perimeter of a blasthole drill shroud substantially improves dust control. This modification reduced respirable dust by 66%–81% in the immediate vicinity of the shroud...
• Noise Controls for Jumbo Drills Used in Metal/Nonmetal Mines
  1/9/2020 - Research projects
  A project to develop durable noise controls that reduce the noise exposure of jumbo drill operators and facilitate the commercialization of the controls to make them available for all miners.
• Development of a Mine Rescue Drilling System and Robotics Mission Feasibility Study
  7/18/2016 - Interagency agreements
  An interagency agreement to conduct experiments to improve the efficiency and speed of drilling operations and develop robots and robotic assist technology.
• New Equipment and Protocol for Drilling Large-Diameter Rescue Boreholes
  7/21/2015 - Unpublished documents and reports
  A feature story about new equipment and protocol for drilling large-diameter rescue boreholes.
• Evaluations of a noise control for roof bolting machines
  12/1/2012 - Non-peer reviewed journal articles
  This paper reports results of field tests of the device conducted at five underground coal mines. Noise reduction was assessed by comparing the operator’s noise exposure during drilling with and without the drill bit isolator.
• The Evolution of Drill Bit and Chuck Isolators to Reduce Roof Bolting Machine Drilling Noise
  1/1/2012 - Peer reviewed journal articles
  This paper documents the evolution of the bit isolator and chuck isolator. Laboratory testing confirms that production bit and chuck isolators reduce the A-weighted sound level generated during drilling by 3.7 to 6.6 dB.
• Acoustic Assessment of Pneumatic and Electric Jackleg Drills used in the Mining Industry
  4/1/2010 - Conference papers
  This paper presents an acoustic assessment of pneumatic and electric jackleg drills involving Noise Source Identification (NSID), penetration rate measurements, operator’s cumulative noise dose measurements, and determination of sound power levels.
• Improved Drill Shroud Capture of Respirable Dust Utilizing Air Nozzles Underneath the Drill Deck
  1/1/2010 - Peer reviewed journal articles
  This study tests the ability of a new air nozzle system, located under the drill deck shroud, to improve the dust capture of the drill deck shroud.
• Development of Roof-Bolting Machine Bit and Chuck Isolators for Drilling Noise Reductions
  11/1/2009 - Conference papers
  NIOSH is developing bit and chuck isolators to reduce vibration, and thus noise radiation of the drill steel, with the longer-term goal of reducing roof bolting machine operator noise exposure.
• A Technique for Estimating the Sound Power Level Radiated by Pneumatic Rock Drills and the Evaluation of a CSIR Prototype Rock Drill with Engineering Noise Controls
  5/1/2009 - Peer reviewed journal articles
  This report describes research by NIOSH to reduce the noise exposures of jackleg drill operators and to prevent additional cases of noise induced hearing loss (NIHL) by developing and evaluating low-cost retrofit noise controls for equipment.