TOOL FOR DEEP DRILLING AND METHOD OF ITS MANUFACTURE Russian patent published in 1998 - IPC

FIELD: machining. SUBSTANCE: tool has hollow cylindrical body used for connection with stem and tool unit partially arranged in body. Outer portion of peripheral cutting tip is rigidly connected with hollow body whose rigid connection with tool unit is effected by means of soldering. In making the longitudinal recesses in the blank of tool unit, cylindrical tail is left in which technological center is made. This center is used for final treatment of working members of tool, after which tail is removed. EFFECT: enhanced reliability and durability; high accuracy of manufacture. 6 cl, 4 dwg