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TECHNICAL PAPERS

Mechanistic Model for Spade Drills for Wood Drilling Operations, Part 2: Analysis of Spade Bit Geometry and Performance

[+] Author and Article Information
Hanxin Zhao, Kornel F. Ehmann

Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3111

J. Manuf. Sci. Eng 125(2), 236-244 (Apr 15, 2003) (9 pages) doi:10.1115/1.1559157 History: Received October 01, 2001; Revised October 01, 2002; Online April 15, 2003
Copyright © 2003 by ASME
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References

Figures

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Experimental and predicted results for SNH25 (1000 rpm, 508 mm/min)
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Rake and clearance angle distribution along the tip cutting edge as a function of tip point angle (tip width 6.35 mm, clearance angle 10 degrees)
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Tip cutting edge profile, clearance and rake angle and elemental torque and thrust force distributions (LNG15)
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Rake and clearance angle distribution along the major cutting edge as a function of micro-groove angle (Zero helix angle)
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The major cutting edge profile, and rake and clearance angle and torque and thrust distributions along the major cutting edge (LNG15 and SNG15)
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Major cutting edge torque and thrust as a function of micro-groove angle (zero helix angle)
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Rake and clearance angle distribution along the major cutting edge as a function of helix angle (Non-zero helix angle)
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The major cutting edge profile, rake, clearance angle, elemental torque and thrust force distributions along the major cutting edge (LNH25 and SNH25)
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Major cutting edge torque and thrust (non-zero helix angle)
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Rake and clearance angle distribution along the major cutting edge (S-shaped generator with zero helix angle)
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Major cutting edge torque and thrust (S-shaped generator with zero helix angle)
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Rake and clearance angle distribution along the major cutting edge (S-shaped generator with 25 degree helix angle)
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Major cutting edge torque and thrust (S-shaped generator with 25-degree helix angle)
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Rake and clearance angle distribution along the chisel edge as a function of the flank surface generator’s motion direction angle φ
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The chisel edge profile, rake and clearance angle and elemental force and torque distributions along the chisel edge (φ=0)
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Chisel edge torque and thrust
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Definition of the spur point angle
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Rake and clearance angle distribution along the spur as a function of the spur point angle
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Torque and thrust force generated by the spur
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The rake and clearance angle distribution along the major cutting edge
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Torque and thrust force comparison
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Torque and thrust vs. spindle speed for a chip-load of 0.508 (mm/rev)
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Torque and thrust vs. chip-load for the four basic topologies

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