FIELD: mechanical engineering. SUBSTANCE: this is used for drilling deep holes of small diameter of accuracy class I with surface cleanliness of 7-10 class and deviation of hole geometrical form in cross section of up to 0.01 mm. Tool has spike 1, stem which is made up of working part 2, adapter bush 3 and load-bearing part 4, and tailpiece 5. Wedge surface of stem is made at angle which is larger than angle of wedge surface of spike, thus angular contacting joint is formed with side opposite to top of angle of adjoining wedge surfaces of spike and stem. Size of joint is within 0.1-0.15 mm. EFFECT: high efficiency. 4 dwg
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