Mikron Tool CrazyDrill Cool

CrazyDrill Cool from Mikron Tool is a small drill with through-tool cooling that resolves drilling problems in difficult-to-machine materials.

Combined use of a pilot drill (solid carbide drill bits CrazyDrill Pilot or CrazyDrill Crosspilot) and CrazyDrill Cool allows drilling depths of up to 15 x d (other standard lengths: 6 x d and 10 x d) and drill size diameter ranges from 0.75 mm to 6 mm (.030” – .236”).

A shaft-integrated power chamber (up to a drill diameter of 2.95 mm/.116”) allows a more efficient coolant supply directly to the drill tip, which results in higher drilling speeds and tool life.

In addition, the drilling concept for the CrazyDrill Cool is an alternative to long and costly deep-hole drilling methods using single-lip drills (gundrills).

Additional Information


CrazyDrill Cool is especially designed for deep holes and is based on a two-stage principle. Centering and pilot drilling is carried out in one step with two types of drill bits: CrazyDrill Pilot or CrazyDrill Crosspilot. CrazyDrill Cool then reaches the maximum drilling depth in one or more pecks (depending on material). By means of fine-tuned tolerances, the long drill is not only guided in a cylindrical bore, but also produces a top quality hole. On inclined surfaces, the combination with CrazyDrill Crosspilot works best, allowing center drilling with an inclination angle of up to 60°.

Two spiral cooling channels leading up to the drill tip supply the cutting edges with coolant even at lower pressure because of the power chamber in the shaft (up to a drill diameter of 2.95 mm/.116”). Oil volume that is three times greater flows through the shaft at the same pressure, allowing high drilling speeds and guarantees better tool life and more efficient chip removal.
The special cutting geometry of CrazyDrill Cool affords optimal chip flow, while the need to remove chips depends on the material to be machined and the drilling depth.

A clearly defined drilling process allows a high degree of process reliability, which when combined with fast drilling speeds, produces time-savings compared to conventional tooling.

In order to machine nonferrous metals as well as high-quality and difficult materials successfully, CrazyDrill Cool is available with or without coating depending on need.