Tap with relief

Details Tap with relief Tap with relief

1991-08-22

1992-07-07

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

With pitch-stabilizing ridge

408222, 470198, B23G 506

Patent

active

051277760

ABSTRACT:
There is a tap whose thread portion 2 forms a cutting section 5 and a guiding section 6 and is provided on a plurality of adjacent thread teeth of the cutting section 5 with a relief 8. It is desirable that a further machining measure be provided for the tap whereby favorable compromises can be obtained with respect to guidance and friction. This is achieved in that the relief 8 of the adjacent cutting-section 5 thread teeth--seen in a longitudinal direction--have a clearance angle which varies increasingly or decreasingly. Varying the relief enables the requirements with respect to avoiding incorrect tapping and avoiding friction-generated cold welding to be met and matched up in an improved manner.

REFERENCES:
patent: 1845063 (1932-02-01), Trbojevich

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