Tap

Details Tap Tap

1992-04-10

1994-06-07

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

With pitch-stabilizing ridge

470198, B23G 506

Patent

active

053183932

ABSTRACT:
In a tap having a lead part and a complete thread part contiguous to the lead part, a relief is formed on at least one of a leading flank and a following flank of each of a plurality of thread ridges formed on the rear end side of the lead part and each of a plurality of thread ridges formed on the front end side of the contiguous complete thread part, so that the portion of an internal thread having been cut already by the preceding cutting edge may not be cut again and widened by the succeeding cutting edge.

REFERENCES:
patent: 832380 (1906-10-01), Hartness

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