Thread tapping cutting tool

Details Thread tapping cutting tool Thread tapping cutting tool

B - Operations, Transporting

23

G

B23G 5/06 (2006.01) B23G 5/00 (2006.01) B23G 5/02 (2006.01)

Patent

CA 2155962

The present invention relates to a thread tapping cutting tool, which has a working part (1) provided with an introductory chamfer part (1b) and control part (1s) both arranged at one end of a shank (Z) while the other end of the said shank (Z) is preferably of rectangular section so as to serve for fitting-on. The working part (I) contains at least two cutting wings (V) and flutes (H) between the said cutting wings (V) at least alongside the cutting wings (V). According to the present invention, the width (V) of the said cutting wings is designed to a value not exceeding 0.2 to 0.02 times the tap drill outer diameter (D). Within the working part (1) the chamfer part (1b) length is equal to at least the half length of working part (1) and its land (h) designed as a plane surface so as the relief angle (.alpha.) exceeds 5° and is preferably 15°.

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