Abstract: Based on the kinematic relationship of the drill, drill point and
workpiece and the coordinate systems founded, the mathematical
models of the drill point wandering motion for the drill initial
penetration, i.e. the formulate for the drill point center
locus, hole shape and cutting edge locus, are
established. According to these formulae the hole shape to be
made is simulated and analyzed. It is verified that the bending
chatter of the drill during the drill penetrating is the main
cause to form a polygon like hole.
Key words: Drill
point Initial penetration Wandering motion Mathematical model
Manuscript received on
April 17, 1998; revised manuscript July 9, 1999
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