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The National Institute for Occupational Safety and Health (NIOSH)





Mining Publication: The Evolution of Drill Bit and Chuck Isolators to Reduce Roof Bolting Machine Drilling Noise
Keywords: Drilling Drills Noise Noise and vibration control Noise control equipment 
 Sound level
Original creation date: January 2012
Authors: DS Yantek, JS Peterson
Peer Reviewed Journal Article - January 2012
Download PDF Document (0.84 MB)
NIOSHTIC2 Number: 20040458
Trans Soc Min Metal Explor TP-10-032, 2012 Jan; 330:429-437
Among underground coal miners, hearing loss remains one of the most common occupational illnesses. To address this problem, the U.S. National Institute for Occupational Safety and Health Office of Mine Safety and Health Research (NIOSH OMSHR) conducts research to reduce the noise emission of underground coal mining equipment, an example of which is the roof bolting machine. Field studies show that, on average, drilling noise is the loudest noise that roof bolting machine operators would be exposed to, and it contributes significantly to the operators’ noise exposure. OMSHR has determined that the drill steel and chuck radiate a significant amount of noise during drilling. OMSHR and the Corry Rubber Corporation (CRC) have developed a bit isolator that breaks the steel-to-steel link between the drill bit and drill steel and a chuck isolator that breaks the mechanical connection between the drill steel and the chuck. This effectively reduces the noise radiated by the drill steel and chuck and in turn reduces the noise exposure of roof bolter operators. 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.
Image of publication The Evolution of Drill Bit and Chuck Isolators to Reduce Roof Bolting Machine Drilling NoisePeer Reviewed Journal Article - January 2012
Download PDF Document (0.84 MB)
NIOSHTIC2 Number: 20040458
Trans Soc Min Metal Explor TP-10-032, 2012 Jan; 330:429-437
See Also
Analysis of a Mechanism Suspension to Reduce Noise from Horizontal Vibrating Screens
Determination of Sound Exposures (DOSES): Software Manual and Implementation Guide
Development of Roof-Bolting Machine Bit and Chuck Isolators for Drilling Noise Reductions
Less Sound Underground: Reducing Roof Bolting Machine Drilling Noise
A Noise Control for A Roof Bolting Machine: Collapsible Drill Steel Enclosure
Practical Application of a Partial Cab to Reduce the A-Weighted Sound Level at the Operator's Station on Surface Drill Rigs
Results of Noise Measurements from Underground Testing of a Roof Bolting Machine Duty Cycle
Sound Power Level Study of a Roof Bolter
Technology News 536 - NIOSH Develops New Software to Analyze and Reduce Noise Exposure
Water Well Safety Bits: Health And Safety Information For The Water Well Industry
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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