DRILL
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United States of America Patent
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N/A
Issued Date -
May 10, 2012
app pub date -
Jul 2, 2010
filing date -
Jul 14, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A drill (1) for producing a drilled hole in workpieces comprising fibre-reinforced plastic is proposed, with at least one main cutting edge (3) on the end face, with at least one secondary cutting edge (11), provided in the region of a circumferential surface (9) of the drill (1), and with circularly ground lands (21), circumferentially adjoining the at least one secondary cutting edge (11, 11′). The drill is distinguished by the fact that the preferably continuous circularly ground lands (21) have, starting from a front region of the drill (1), a first longitudinal portion (22) with a first width (B1) and, adjoining thereto, a second longitudinal portion (24) with a second width (B2), wherein the width (B1) of the first longitudinal portion (22) is less, preferably less by a multiple, than the width (B2) of the second longitudinal portion (24).
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