METHOD OF MACHINING SHAPED WORKPIECE AND COMPOSITE TOOL FOR ITS REALIZATION Russian patent published in 1994 - IPC

FIELD: mechanical engineering, machining of materials. SUBSTANCE: composite tool has housing 1 with cutting members 2 mounted at its end face and changeable tip 3 with shaped cutting edges 4. Centering drill 7 is mounted in the tip center. After the composite tool is fixed in drilling head, it is fed to the workpiece, and one half of the workpiece is first drilled and then, after the tip is turned through 180 deg, its second half. The ratio of the length of operating travel of the tool in drilling the first half of the hole to the length of its operating travel in drilling the second half of the hole is 2-2.1: 1. EFFECT: extended operating capabilities. 3 cl, 12 dwg