Two-flute gun drill

Abstract

PURPOSE: To improve the finished surface precision by forming the sectional shape of two oil holes into nearly triangular form, in conformity with the sectional shape of two cutting oil feeding holes on a gun drill body and increasing the feed quantity of cutting oil. CONSTITUTION: In a two-flute gun drill 2, each sectional shape of two oil holes 21a and 21a is formed into nearly triangular form in conformity with the sectional shape of the cutting oil feeding holes 13b and 13b of a shank 13. Therefore, the fluid passing sectional area of the joint part between a solid tip 21 and the shank 13 can be made equal to the fluid passing sectional area of two cutting oil feeding holes 13b and 13b. Therefore, the feeding quantity of cutting oil can be increased, and the finished surface precision can be improved. COPYRIGHT: (C)1987,JPO&Japio

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Patent Citations (1)

    Publication numberPublication dateAssigneeTitle
    JP-S5817692-UFebruary 03, 1983

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