Solid Carbide Drill Creates Deep Holes in Stainless Steel

CrazyDrill Cool SST-Inox is a solid carbide drill, available in diameters from 1 to 6 mm. It is designed for machining of stainless steels, heat resistant alloys (nickel-based) and chrome-cobalt alloys. After the 2016 launch of the short versions (6 × d and 10 × d), the tool is now available for drilling depths of 15 × d and 20 × d. With this, Mikron Tool is emphasizing deep-hole drilling in stainless steels.

The company built upon the geometry of the short version of these drills and its “chip-breaking profile” at the front of the tools. They also use an enlarged flute profile in the rear section of the flute, which provides cooling and chip evacuation. The smooth surface of the spiral flutes represents a significant difference when drilling more than 10 × d. These two features together assure even force requirements when drilling deep. A single feed stroke is sufficient to reach the full drilling depth and dependably flush the chips from the flutes, the company says.

This drill has integrated cooling ducts which deliver the coolant right to the drill tip. These ducts have a cross section in the form of a drop, which is said to deliver as much as four times the coolant volume of coolant ducts with around cross section. To guarantee this cooling performance in small drill diameters, the shank is also equipped with an additional power chamber. This high cooling performance helps prevent the overheating and subsequent chipping of cutting edges and build-up of material.