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Accurate and rapid drilling up to 15 x d

Centering / pilot drilling and deep-hole drilling

The deep-hole drill CrazyDrill Cool perfectly matches with the program of CrazyDrill Pilot (pilot drill or short drill).

Pilot drilling with CrazyDrill Pilot or, on inclined surfaces, with CrazyDrill Crosspilot constitutes the base of accurate deep-hole drilling and stable machining. The pilot drill yields a high degree of position accuracy due to its short and sturdy design. In addition, the follow-up drill (CrazyDrill Cool 6 to 15 x d) is guided cylindrically by the pilot hole, thus guaranteeing perpendicularity and alignment accuracy.

The tool tolerances guarantee the hole quality (no measurable transition from pilot to follow-up hole) as well as the stable machining process (no jamming).

Tolerance of the pilot drill CrazyDrill Pilot (m5):

< 3 mm (.118”): + 0.002 mm /+ 0.006 mm (+.00008” /+ .0002”)
≤ 6 mm (.236”): + 0.004 mm /+ 0.009 mm (+.00016” /+ .0004”)

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

< 3 mm (.118”): 0 mm /+ 0.006 mm (0” /+ .0002”)
≤ 6 mm (.236”): + 0.001 mm /+ 0.009 mm (+ .00004” /+ .0004”)

Tolerance of the follow-up drill CrazyDrill Cool 6 up 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” /+ .0002”)

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

Rapid deep-hole drilling up to 15 x d

1. Pilot drilling (in one step)
2. Deep-hole drilling up to 15 x d

CrazyDrill Cool drilling operation in one step (see cutting data chart)

1. Pilot drilling up to drilling depth 2 x d:

MikronTool-Products-Process-Drilling-depth-2xd
MikronTool-Products-Process-Drilling-depth-2xd-inclined-surface

2. CrazyDrill Cool:

  • Switch on coolant of the CrazyDrill Cool
MikronTool-Products-Process-CrazyDrill-Cool-XL-point-2
  • Drill at recommended drilling speed and feed rate (see cutting data) to full depth in one step
MikronTool-Products-Process-CrazyDrill-Cool-XL-point-5
  • After the desired cutting depth is reached, return at feed rate or rapid traverse
MikronTool-Products-Process-CrazyDrill-Cool-XL-point-7

Drilling operation of CrazyDrill Cool with chip break and chip removal (see cutting data chart)

G83 deep-drilling cycle with chip break and chip removal
Q = depth of the respective peck

1. Pilot drilling up to drilling depth 2 x d:

MikronTool-Products-Process-Drilling-depth-2xd
MikronTool-Products-Process-Drilling-depth-2xd-inclined-surface

2. CrazyDrill Cool:

  • Switch on coolant of the CrazyDrill Cool
MikronTool-Products-Process-CrazyDrill-Cool-XL-point-2
  • First peck Q1: go down at drilling speed and feed rate (see cutting data) and drill up to maximum drilling depth Q1 in one peck, afterwards remove chips
MikronTool-Products-Process-CrazyDrill-Cool-XL-Q1
MikronTool-Products-Process-CrazyDrill-Cool-XL-Q1-Qx
  • After the desired cutting depth is reached with the drill, return at feed rate or rapid traverse
MikronTool-Products-Process-CrazyDrill-Cool-XL-point-7

Note:

Drill can be taken completely out of the hole in between pecks. However if vibrations occur we recommend that the drill tip never exits hole to prevent breakage.

Tested and approved

Mikron Tool has determined the ideal cutting parameters (drilling speed to tool life ratio and process reliability) when using CrazyDrill Cool 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.

Packaging

An impact-resistant and user-friendly drill packaging is absolutely necessary for CrazyDrill Cool.  Mikron Tool offers all tools of the CrazyDrill Cool 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.

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