MACHINERY RESONANCE AND DRILLING

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New developments in vibration analysis better explain machinery resonance, through an example of drill bit chattering during machining of rusted steel. The vibration of an operating drill motor was measured, the natural frequency of an attached spring was measured, and the two frequencies were compared to show that the system was resonant. For resonance to occur, one of the natural frequencies of a structural component must be excited by a cyclic force of the same frequency. In this case, the frequency of drill bit chattering due to motor rotation equaled the spring frequency (cycles per second), and the system was ... continued below

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Leishear, R. & Fowley, M. January 23, 2010.

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New developments in vibration analysis better explain machinery resonance, through an example of drill bit chattering during machining of rusted steel. The vibration of an operating drill motor was measured, the natural frequency of an attached spring was measured, and the two frequencies were compared to show that the system was resonant. For resonance to occur, one of the natural frequencies of a structural component must be excited by a cyclic force of the same frequency. In this case, the frequency of drill bit chattering due to motor rotation equaled the spring frequency (cycles per second), and the system was unstable. A soft rust coating on the steel to be drilled permitted chattering to start at the drill bit tip, and the bit oscillated on and off of the surface, which increased the wear rate of the drill bit. This resonant condition is typically referred to as a motor critical speed. The analysis presented here quantifies the vibration associated with this particular critical speed problem, using novel techniques to describe resonance.

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  • ASME US National Congress of Theoeretical and Applied Mechanics

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  • Report No.: USNCTAM2010-577
  • Grant Number: DE-AC09-08SR22470
  • Office of Scientific & Technical Information Report Number: 970953
  • Archival Resource Key: ark:/67531/metadc927558

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Office of Scientific & Technical Information Technical Reports

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  • January 23, 2010

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 12:22 p.m.

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Leishear, R. & Fowley, M. MACHINERY RESONANCE AND DRILLING, article, January 23, 2010; South Carolina. (digital.library.unt.edu/ark:/67531/metadc927558/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.