Page 8 of Gun Drills by Stock Precision Tools

two-fluted gun drills type tbz-solid carbide head suitable for cast iron aluminium-alloys contents silicon more than 8 and other short-chipping non-ferrous materials we are able to manufacture these solid carbide head gun drills in the diameter range from 6.0 to 27.0 mm with a total length of max 1000 mm please use the form on page 16 for special inquiries orders 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 of more than 10 we recommend our molyglide coating however two-fluted gun drills type tbz-solid carbide head can only be coated with molyglide up to an overall length of max 500 mm due to the technical production process the essential advantage of the two-fluted gun drills compared to the single-fluted ones is a better performance thanks to the higher feed rate this results out of the double cutting edges and two flutes of course the hole accuracy of single-fluted gun drills can not be reached this is also a direct consequence of the drill design with two cutting edges as the cutting edges are positioned opposite each other there is less of a smoothing effect and less support in comparison to a single-fluted gun drill for drilling depth up to 10 x d we recommend our superv-95 gg see our main catalogue the dimensions required to calculate the length for conventional machine tools head length driver max flute length per tool 40 x d for larger drilling depths apply two tools i.e Ø 10 x 450 and Ø 9,95 x 850 mm d1 re-grind 1,5 x d drilling depth flute length total length min distance ~6xd driver length standard point grinds special point grinds available point grind g for machining cast iron 28° 10° point grind a for machining aluminium 0,5 20° +0 ,3 with chip breaker and chip splitter 10 ° 60 ° 0,5 +0,3 ° 60 120° d 140° d 130 o 8 gun drills

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