Title page for ETD etd-42698-205111


Type of Document Master's Thesis
Author Adler, W. Alexander III
Author's Email Address aadler@vt.edu
URN etd-42698-205111
Title Testing and Understanding Screwdriver Bit Wear
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Reinholtz, Charles F. Committee Chair
Mitchell, Larry D. Committee Member
Saunders, William R. Committee Member
Keywords
  • Phillips
  • Screwdriver Bit
  • Cam-Out
  • Surface Contact
  • Tool Wear
  • User Emulation
Date of Defense 1998-05-18
Availability unrestricted
Abstract
This thesis is focused on gaining a better knowledge of how to design and test Phillips screwdriver bits. Wear is the primary concern in applications where the bit is used in a power driver. Such applications include drywalling, decking and other construction and home projects.

To pursue an optimal design, designers must have an understanding how the bit geometry changes with wear. To make use of the geometrical data, the designer must also have an understanding of the fundamentals of the bit/screw surface contact and its effect on force distribution.

This thesis focuses on three areas. First, understanding how the tool and bit are used, and what factors contribute to bit wear. With this understanding, a test rig has been designed to emulate typical users and, in doing so, produce the factors that cause wear. Second, there must be a means to analyze geometric changes in the bit as it wears. A method for doing this was developed and demonstrated for a Phillips bit, but the process can be applied to other bits. Finally, the fundamentals of surface contact must be understood in order to apply the geometrical information obtained to improved bit design.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  appendix.pdf 178.09 Kb 00:00:49 00:00:25 00:00:22 00:00:11 < 00:00:01
  chapter_1.pdf 10.73 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  chapter_2.pdf 14.11 Kb 00:00:03 00:00:02 00:00:01 < 00:00:01 < 00:00:01
  chapter_3.pdf 146.43 Kb 00:00:40 00:00:20 00:00:18 00:00:09 < 00:00:01
  chapter_4.pdf 114.35 Kb 00:00:31 00:00:16 00:00:14 00:00:07 < 00:00:01
  chapter_5.pdf 75.27 Kb 00:00:20 00:00:10 00:00:09 00:00:04 < 00:00:01
  chapter_6.pdf 46.01 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01
  chapter_7.pdf 12.90 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  intro.pdf 15.42 Kb 00:00:04 00:00:02 00:00:01 < 00:00:01 < 00:00:01
  refrences.pdf 9.13 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  title.pdf 3.91 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

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