CrazyDrill Flex

June 13, 2012

One year ago, Mikron Tool introduced flexible solid carbide drills and earned respect from the producers of deep hole drills, because these drills, starting at 0.1mm diameter, achieved drilling depths up to 30 x D. Today, the Swiss tool producer takes another step forward and expands their drilling program of CrazyDrill Flex. We are now talking about drilling depths up to 50 x D with integrated cooling which is indispensable for these extreme drilling depths. Also new is an option especially for the machining of Titanium.

Many characteristics of the new, extra-long tool resemble its "precursor": Just like the first version of CrazyDrill Flex, this new version keeps the special features of the flexibility of a HSS drill and the precision and long tool life of a solid carbide drill (and, is such a tool). Also this version has a flexible centerpart between the drill section and the clamping shank allowing the necessary elasticity to the tool which guarantees a sure-process drilling even under difficult circumstances (for example, drilling with alignment errors or under unstable circumstances). New is the length starting at 0.3mm diameter and drilling depths up to 50 x D. Also new is the integrated cooling in the tool. The coolant is conducted through the shank and is therefore effective on every pecking and always guided directly to the cutting edge, independently of the tool length. Due to the special configuration and profile of the coolant holes, a very concentrated stream is achieved and able to clean the flutes. Also in case of high speed the coolant stream remains concentrated. Beside the conventional cutting oil, it's also possible to apply an air-oil-mist lubrication.

The success of the CrazyDrill Flex is based on a controlled drilling process with cosistent and frequent pecking. Normally, you machine with drill steps of 0.5 up to 1 x D; cutting speed and feed depend on the material to machine but compared to the "short" version, it has to be reduced slightly. Before operating with this tool for the first time, we recommend to ask for some "initial help" from the specialists at Mikron Tool. Topping off this program is an execution with modified geometry, especially adapted for the machining of Titanium. Also for this version it should be noted: for drilling depths up to 30 x D, the Flex drill works very well with external lubrication. For drilling depths up to 50 x D the Flex drill has an internal cooling in the shank.

Everybody who has experience with this type of difficult machining conditions, knows that a previous centering resp. pilot drilling, is an important factor. For this purpose the user has a complimentary program at their disposal with adapted geometry from the CrazyDrill family for both options.

The Flex drills are available in steps of one hundredth millimeter (from stock in steps of five hundredths millimeter) for drilling depths of 50 x D, as well as the "shorter" lengths of 20 x D and 30 x D, as to date.

Related Glossary Terms

  • centering


    1. Process of locating the center of a workpiece to be mounted on centers. 2. Process of mounting the workpiece concentric to the machine spindle. See centers.

  • coolant


    Fluid that reduces temperature buildup at the tool/workpiece interface during machining. Normally takes the form of a liquid such as soluble or chemical mixtures (semisynthetic, synthetic) but can be pressurized air or other gas. Because of water’s ability to absorb great quantities of heat, it is widely used as a coolant and vehicle for various cutting compounds, with the water-to-compound ratio varying with the machining task. See cutting fluid; semisynthetic cutting fluid; soluble-oil cutting fluid; synthetic cutting fluid.

  • cutting speed

    cutting speed

    Tangential velocity on the surface of the tool or workpiece at the cutting interface. The formula for cutting speed (sfm) is tool diameter 5 0.26 5 spindle speed (rpm). The formula for feed per tooth (fpt) is table feed (ipm)/number of flutes/spindle speed (rpm). The formula for spindle speed (rpm) is cutting speed (sfm) 5 3.82/tool diameter. The formula for table feed (ipm) is feed per tooth (ftp) 5 number of tool flutes 5 spindle speed (rpm).

  • feed


    Rate of change of position of the tool as a whole, relative to the workpiece while cutting.

  • flutes


    Grooves and spaces in the body of a tool that permit chip removal from, and cutting-fluid application to, the point of cut.

  • high-speed steels ( HSS)

    high-speed steels ( HSS)

    Available in two major types: tungsten high-speed steels (designated by letter T having tungsten as the principal alloying element) and molybdenum high-speed steels (designated by letter M having molybdenum as the principal alloying element). The type T high-speed steels containing cobalt have higher wear resistance and greater red (hot) hardness, withstanding cutting temperature up to 1,100º F (590º C). The type T steels are used to fabricate metalcutting tools (milling cutters, drills, reamers and taps), woodworking tools, various types of punches and dies, ball and roller bearings. The type M steels are used for cutting tools and various types of dies.

  • shank


    Main body of a tool; the portion of a drill or similar end-held tool that fits into a collet, chuck or similar mounting device.

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