Patent ID: 7419339

Claim:
Drill thread milling cutter ( 1 ) a) which is rotatable about an axis ( 4 ) at least in one direction of rotation ( 15 ), and has b) a drilling region ( 40 ) with at least one drilling cutting edge ( 17 , 18 , 27 , 28 ) for producing a bore in a workpiece, and c) a thread milling region ( 30 ) with at least one milling cutting edge ( 7 , 8 , 9 , 10 ) for the subsequent milling of a thread in the bore of the workpiece, wherein axially relative to the axis ( 4 ), following at least one drilling cutting edge ( 17 , 18 , 27 , 28 ) of the drilling region ( 40 ), in each case at least one associated milling cutting edge ( 8 , 10 ) of the thread milling region ( 30 ) is arranged at an associated common drilling chip space ( 11 , 12 ) for removing the drilling chips produced by the drilling cutting edge and preferably also for removing the milling chips produced by these milling cutting edges, and in which at least one further milling cutting edge ( 7 , 9 ) of the thread milling region ( 30 ), is arranged at at least one milling chip space ( 13 , 14 ) for removing the milling chips produced by this at least one further milling cutting edge, this milling cutting edge ( 7 , 9 ) being offset in the direction of rotation relative to the milling cutting edge(s) at the drilling chip space ( 11 , 12 ) which is (are) arranged so as to follow the drilling cutting edge(s), the volume of each drilling chip space ( 11 , 12 ) available for the chip removal being greater than that of the milling chip space or spaces ( 13 , 14 ) and each milling chip space ( 13 , 14 ), at its point closest to the axis ( 4 ), lying on a diameter (dmin 2 ) which is between 42% and 75% of the outside diameter (d 0 ) of the thread milling region ( 30 ), and each drilling chip space ( 11 , 12 ), at its point closest to the axis ( 4 ), lying on a diameter (dmin 1 ) is between 27% and 50% of the outside the diameter (d 0 ) of the thread milling region ( 30 ).