GUHRING - Ружейные сверла - 2008 EN

                                                                    для размещения заказа - guhring@guhring-tools.ru

       Two-fluted gun drills with solid carbide head ZB 80

       suitable for cast iron, aluminium and short-chipping
       non-ferrous metals, from  6.0 - 27.0 mm,
       max. total length 1000 mm

       M MolyGlide

       For certain materials a coating is required, as the successful application of gun drills with a bright surface finish cannot be guaranteed. For chilled cast
       iron and Al cast alloys with a Si-content above 10% we recommend our MolyGlide-coating. However, two-fluted gun drills type ZB80 can only be coa-
       ted with MolyGlide up to an overall length of maximum 500 mm due to the technical production process. See also the GuhringNavigator.

ZB 80  The main advantage of two-fluted gun drills compared to                             cutting edges. As the cutting edges are positioned opposite
       single-fluted gun drills is the substantially higher feed rate                      each other, there is less of a smoothing effect and less sup-
       that can be applied during the production of the hole. This                         port in comparison to a single-fluted gun drill. For drilling
       is due to the design of the two-fluted gun drill, it has two                        depths  10 x D we recommend our Ratio drill RT 150 GG,
       cutting edges and two flutes. Holes can therefore be pro-                           available ex stock and more cost-effective for these drilling
       duced considerably faster. However, this increase in machi-                         depths than brazed gun drills. In addition, RT 150 GG does
       ning speed is combined with a reduction in hole accuracy.                           not require a pilot hole in most applications.
       This is also a direct consequence of a drill design with two

       The dimensions required to calculate the length                                                                                                        * max. flute length per tool
       for conventional machine tools                                                                                                                         40 x D, for larger drilling
                                                                                                                                                              depths apply two tools. (i.e.
                                                                              head length                                                                      10 x 450 and  9.95 x 850
                                                                                                                                                              mm)

                                                                                                                 driver

                                        d1re-grind drilling depth                          min. distance         driver length
                                                                                          28°1,5 x Dflute length*3xD
                                                                                              10°
                                                                                                                                                     20°total length
                                                                                                                                                         10°
        ZB 80                                      Point grind G                           Point grind A
        Standard point grinds                      for machining                           for machining

        (special point grinds available)               cast iron                             aluminium
                                                                              0,5+0,3
       30 Gun drills                                                                                                                                          0,5+0,3
                                                  120°
                                                   D
                                                                                                            60°
                                                  60°

                                                                                           120°
                                                                                             D

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