| 摘要 |
a. Device for twisting a hollow-grooved boring tool or a filing tool, their manufacturing method and tools obtained thereby. b. Apparatus characterised in that it comprises a mandrel portion 5 holding the base portion of a boring tool 1 or of a filing tool, and a vice 7 fitted with several jaws capable of compressing the respective sides of the boring tool, it being possible for the mandrel portion and the vice to move apart by rotating one with respect to the other, these being mounted so as to be able to move forward and back depending on the thickness of the boring tool. c. The invention relates to a device for twisting a hollow-grooved boring tool or a filing tool, their manufacturing method and tools obtained thereby. <IMAGE>
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