TAP WITH DRILL AND METHOD FOR CUTTING INTERNAL THREAD
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United States of America Patent
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Issued Date -
Jan 5, 2012
app pub date -
Feb 20, 2009
filing date -
Feb 20, 2009
priority date (Note) -
Abandoned
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Abstract
A tap with drill includes a drill portion including a plurality of chip discharge grooves and having drill blades for cutting a prepared hole. The tap further includes a tap portion for cutting the internal thread on an inner circumferential surface of the prepared hole formed by the drill blades, and oil holes. The tap with drill is applied for performing cutting work. The drill blades and thread cutting edges include three blades formed along chip discharge grooves, respectively. The oil holes are helically formed in three with the same leads as the chip discharge grooves and opened at relief surfaces of the drill blades, respectively. The chip discharge grooves straddle the drill portion and the tap portion in fixed groove sectional shapes and have negative lands swelled into grooves.
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