Accurate and quick drilling up to 7 x d

CrazyDrill Steel represents a well-coordinated program with CrazyDrill Pilot (pilot drill respectively short drill). The base for precise deep hole drilling and stable machining is provided by the 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 CrazyDrill Steel (4 x d, 6 x d, 7 x d) 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.

Tolerance of the pilot drill CrazyDrill Pilot (m5):

< 3 mm (.118”): + 0.002 mm /+ 0.006 mm (.00008” /+ .00024”)
≤ 6.35 mm (.250”): + 0.004 mm /+ 0.009 mm (.00016” /+ .00035”)

Tolerance of the pilot drill CrazyDrill Crosspilot (slanted drilling) (k6):

< 3 mm (.118”): 0 mm /+ 0.006 mm (.0” /+ .00024”)
≤ 6.35 mm (.250”): + 0.001 mm /+ 0.009 mm (.00004” /+ .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“ /+ .00024“)

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 CrazyDrill Steel and CrazyDrill Pilot, Mikron Tool has defined a fast and reliable procedure which achieves optimal drilling results.

Quick drilling up to 4 x d

1. When needed: pilot drilling (in one step)

• Pilot drilling or centering is recommended on an irregular or inclined material surface

2. Drilling up to 4 x d

Quick drilling up to 7 x d

1. When needed: Pilot drilling (in one step)

• Pilot drilling or centering is recommended on an irregular or inclined material surface, when there is need for high position accuracy and generally in holes under 0.8 mm

2. Drilling up to 7 x d

CrazyDrill Steel drilling operation with one step (see cutting data chart)

1. When needed: Pilot drilling up to drilling depth of 2 x d:

• With CrazyDrill Pilot or on inclined surfaces with CrazyDrill Crosspilot

2. CrazyDrill Steel:

• 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

Drilling operation of CrazyDrill Steel with chip removal (pecking) (see cutting data chart)

G83 deep-drilling cycle with  chip removal (pecking)
Q = depth of the respective peck

1. When needed: Pilot drilling up to drilling depth of 2 x d: 

• With CrazyDrill Pilot or on inclined surfaces with CrazyDrill Crosspilot

2. CrazyDrill Steel:

• Activate external cooling
• First step  Q1: Go down at drilling speed and feed rate (see cutting data) and drill up to maximum drilling depth Q1 in one step , afterwards remove chips

• Additional pecks Qx (see cutting data chart),  to  remove chips

• After the desired cutting depth is reached with the drill, return at feed rate or rapid traverse

Note:

Drill can be retracted completely from the hole between pecks. If  vibrations occur we do not recommend that the drill be retracted completely from the hole.

Mikron Tool has determined the ideal cutting parameters (drilling speed to tool life ratio and process reliability) when using CrazyDrill Steel and CrazyDrill Pilot respectively CrazyDrill Crosspilot. 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 Steel.  Mikron Tool offers all tools of the CrazyDrill Steel family in a high quality, single package.

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.