The industry produces at capital drilling machines model 2М112 equipped with cartridges of type 2B for drill diameter up to 16 mm with straight shank. However, this shank us made drill bits up to 10 mm. larger is the Morse taper. To use them, I suggest to make the bushing. A tool with a conical shank is inserted into the hole and is held through m & as friction, and the cylindrical part of the sleeve is clamped in the Chuck of the machine. A. VASILENKO, Zaporozhye
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