| 摘要 |
PCT No. PCT/EP95/01600 Sec. 371 Date Oct. 15, 1996 Sec. 102(e) Date Oct. 15, 1996 PCT Filed Apr. 27, 1995 PCT Pub. No. WO95/29030 PCT Pub. Date Nov. 2, 1995A rotary drill comprising a shaft of full carbide metal which shaft is to be connected to the driving spindle of a machine tool. The shaft contains helically extending ducts which run adjacent to one another through the shaft, substantially longitudinally, for transporting cooling fluid to the cutting edge of the drill. At least two of the ducts are covered by a common sealing plate adjacent the cutting end of the shaft, with the sealing plate being a distance from the cutting edges of the drill, to create a closed fluid flow path between the ducts to permit dry operation of the drill.
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