Page 27 - HOLE MAKING CATALOG p149-184
P. 27

USER GUIDE                        SOLID CARBIDE DRILLS

General Recommendations                                               3 Flute Solid Carbide Drills
                                                                      Three flute drills are used extensively on nonferrous metals
     •	 It is mostly recommended to use an external coolant jet       because of their excellent performance on these materials.
        at a minimum pressure of 10 to15 bar during drilling          These solid carbide drills were designed with a special
        for prolonged tool life and to facilitate chip evacuation.    cutting edge geometry that can be used on a broad
                                                                      spectrum of materials including steel, stainless steel, high
     •	 When machining alloy and stainless steel, it is               temperature alloys, cast iron and nonferrous materials.
        mostly recommended to use ER JET 2 collet to                  Their dimensions are according to DIN 6537 standard.
        prolong tool life and prevent built-up edge.                  The SCCD drills are manufactured in m7 diameter
                                                                      tolerance, with cylindrical shanks according to DIN 6535
     •	 Semi-synthetic or emulsion lubricants should                  HA standard, 30° spiral flute helix, 140° head point angle
        be used to extend tool life.                                  and a reinforced web taper.
                                                                      The drills can be used on surface applications of up to 20°
     •	 Drilling stainless steel or high temperature alloys requires  sloped entry/exit. (In this case, the drill should be held in a
        high oil pressure and 7-15% mineral or vegetable based        thermal shrink collet or a MAXIN power chuck). The 3 flute
        oil emulsion for prolonged tool life. Dry machining           solid carbide drills cannot be used on radial drill adjustment
        may badly affect hole quality and drill tool life.            diameter devices such as our FITBORE adapter.

     •	 In case of chip evacuation problems or when poor              20º max
        surface finish is obtained, it is most recommended
        to use pecking cycle.                                         3 Flute Centering Drill  Followed by a
                                                                                               CHAMDRILL
     •	 For optimal performance, it is recommended to use the                                  SUMOCHAM/CHAMGUN
        3 flute, 5xD solid carbide drills in rotating or stationary
        applications with a maximum of 0.02 mm runout.                140º                     140°
        Larger runout will reduce drill performance
        and badly affect hole quality.                                Advantages
                                                                      The drills provide higher hole cylindricity, roundness,
     •	 The solid drills can be clamped into any                      straightness, concentricity and surface finish when
        of ISCAR’s tooling systems such as:                           compared to 2 flute solid carbide drills.
                                                                      The 3 flute solid carbide drills with a 140˚ point
     1	 Collet chucks                                                 head can serve as centering drills for CHAMDRILL/
     2	 Thermal shrink chucks                                         SUMOCHAM or CHAMGUN if necessary.
     3	 ISCAR MAXIN power chucks
     •	 It is recommended to use the solid drills in SHORTIN

        adapters with AA super precision collets to obtain a
        high level of hole quality and prolonged drill tool life.
        Balanceable adapters should be used for applications
        above 10,000 RPM in order to minimize vibrations
        and gain a reliable and prolonged cutting edge life.
     •	 Interrupted cut applications reduce hole accuracy,
        quality and drill life.
     •	 See pages 179-180 for troubleshooting
        guide for common problems.
     •	 Solid carbide drills can be used on a wide range
        of materials and different cutting conditions with
        high reliability and performance repeatability.
        This can reduce tool inventory and logistic costs.

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