Accurate and quick short drilling
up to 2 x d with additional 90° chamfer

Centering / Piloting or short drilling

CrazyDrill Pilot (pilot drill or short drill) represents a well-coordinated program with CrazyDrill Cool (for example) for deep hole drilling. The base for precise deep hole drilling and stable machining is provided by pilot drilling with CrazyDrill Pilot or, on inclined surfaces, CrazyDrill Crosspilot. The pilot drill ensures a high position accuracy due to its short and sturdy construction. The pilot hole is the guidance for the subsequent deep hole drill to guide it cylindrically and guarantee the straightness and perpendicularity of the deep hole. The quality of the drilling  as well as the stable  machining process (no jamming) are guaranteed by means of a predetermined tool tolerance. If needed, CrazyDrill Pilot can also perform a 90° chamfer in the same processing step, thus combining a short drill and chamfer tool.

Tolerance of the pilot drill CrazyDrill Pilot (m5):

< 3 mm (.118”): + 0.002 mm /+ 0.006 mm (.00008” /+ .00023”)
≤ 6.35 mm (.250”): + 0.004 mm /+ 0.009 mm (.00016” /+.00035”)

Tolerance of the follow-up drill CrazyDrill Steel 4 x d to 7 x d (k5):

< 3 mm (.118”): 0 mm /+ 0.004 mm (.0” /+ .00016”)
≤ 6.35 mm (.250”): 0.001 mm /+ 0.006 mm (.00004” /+ .00023”)

Tolerance of the follow-up drill CrazyDrill Cool 6 x d to 15 x d (k5):

< 3 mm (.118”): 0 mm /+ 0.004 mm (.0” /+ .00016”)
≤ 6 mm (.236”): 0.001 mm /+ 0.006 mm (.00004” /+ .00023”)

Tolerance of the follow-up drill CrazyDrill Cool XL 15 x d to 40 x d (k6):

< 3 mm (.118”): 0 mm /+ 0.006 mm (.0” /+ .00023“)
≤ 6 mm (.236“): 0.001 mm /+ 0.009 mm (.00004” /+ .00035“)

Drilling process

General information

In the industry of metal work tools, shorter processing times are always in high demand. At the same time, the requirements to the manufacturing precision and the process reliability are extremely high. In order to fulfill these requirements, the "machine tool – spindle – tool – tool holder" system need to be considered as a whole (see additional info).

For the use of the CrazyDrill Pilot, Mikron Tool has defined a fast and reliable procedure which achieves optimal drilling results.

Quick short drilling up to 2 x d and 90° chamfer or pilot drilling

1. Pilot drilling or short drilling up to 2 x d in one step

Drilling up to 2 x d with CrazyDrill Pilot in one step (see cutting data chart)

1. CrazyDrill Pilot:

  • Activate external cooling
  • Go down at drilling speed and feed rate (see cutting data) and drill in one step  
  • After the desired cutting depth is reached with the drill, return at feed rate or rapid traverse


  • If needed, beyond a drilling depth of 2 x d a 90° chamfer can be created using an additional drilling depth


2. Drilling with follow-up drill - drilling process:

  • Drilling with CrazyDrill Steel (Ø 0.4 mm – 6.35 mm (.016" - .250") / up to 7 x d)
  • Drilling with CrazyDrill Alu ( Ø 0.4 mm – 3.0 mm (.016" - .118") / up to 10 x d)
  • Drilling with CrazyDrill Cool (Ø 0.75 mm – 6.0 mm (.030" - .236") / up to 15 x d)
  • Drilling with CrazyDrill Cool XL (Ø 1.0 mm – 6.0 mm (.039" - .236") / up to 40 x d)

Tested and approved

Mikron Tool has determined the ideal cutting parameters (drilling speed to tool life ratio and process reliability) when using CrazyDrill Pilot. These are listed in the cutting data tables according to drill diameter, drilling depth and material to be machined. The detailed cutting data tested by Mikron Tool, such as cutting speed Vc, feed rate f and drilling impact Q, permit a quick and secure machining.

The overview of the cutting values table according to material group, material type, hardness degree and tensile strength, material number, DIN and AISI/ASTM/UNS permits quick determination of the parameters to be used.


An impact-resistant and user-friendly drill packaging is absolutely necessary for CrazyDrill Pilot.  Mikron Tool offers all tools of the CrazyDrill Pilot family in  a high quality, single package.

Notes or further questions

Please find more information about tool holders, cooling or lubrication under “Additional Info”.

Mikron Tool has an international team of cutting technology experts who  are pleased to answer your questions (how to use a drill, tools, machines, tool holders, cooling, machining process…).

Use this link to contact us directly.