Komet Praezisionswerkzeuge Robert Breuning Gmbh

Komet Stahlhalter- Und Werkzeugfabrik Robert Breuning Gmbh

Bernd Killinger

Gerhard Scheer

A tool holder includes a base member (10), a shaft (12) arranged on the rearward end of the base member (10) for connection to a machine spindle and a front facing recess in the front end of the base member arranged coaxially with respect to the shaft axis for receiving therein a coaxially aligned tool (24) which can be clamped in place by means of a clamping member (22). A regulating member (28) is furthermore axially guided in the base member (10), which regulating member serves as a positioning stop for the tool (24). In order to make possible a simple adjustment of the regulating member from a location externally of the tool holder, the regulating member (28) is constructed so that it has an axially extending rack thereon, while a gear (32) mating with the tooth system (30) of the rack and a clamping screw (42) engaging a keyway (38) of the regulating member (28) with its cone tip (44) are supported in the base member (10 ).

Tool holder

In a drilling tool for drilling in solid metal material, in particular for drilling in plate stacks (plate drill), two geometrically similar reversible carbide tips (2, 3) are arranged at different radial distances at the end of the shank (1) and offset from each other by 180.degree. in the circumferential direction, whose working ranges overlap, and each of which comprises several cutting edges (2a, 2b, 3a, 3b) of equal length. Of the cutting edges (2a, 2b, 3a, 3b), respectively two adjacent cutting edges at an obtuse angle (.alpha.) to each other are simultaneously in contact, wherein the radially inner, first reversible carbide tip (2) extends by its cutting edge (2b) which is in contact slightly beyond the drill axis (A), and the radially outer, second reversible carbide tip (3) is axially set back from the first reversible carbide tip (2), and its two operative cutting edges (3a, 3b) form acute angles (.beta.1, .beta.2) of different size with the drill axis (A). The first reversible carbide tip (2) is smaller than the second reversible carbide tip (3). On the same radius as the first reversible carbide tip (2) is arranged a third reversible carbide tip (4) which is also smaller than the second reversible carbide tip (3), in such a way that its operative cuting edge (4a) works approximately on the same working cone and on the same maximum radius (R) as the radially outer cutting edge (3a) of the second reversible carbide tip (3).

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Freiberg, Germany

Bernd Killinger