Guehring Ohg

Guhring Kg

Jochen Gruber

The invention relates to a multiple edge drill such as is especially used for machining difficult-to-machine, e.g. high-toughness materials, such as e.g. cast steel, steel for hardening and tempering or other difficult-to-machine steel materials including metallic cast materials, such as e.g. gray cast iron, and especially GGV or ADI cast iron. The facet is designed in such a manner that the main cutting edge has at least two main cutting edge sections that define point angles of different size, the radially outer point angle being smaller than the radially inner one, thereby obtaining a good cutting behavior and long service life of the tool.

Multiple edge drill

A shrink-fit chuck tool holder for cylindrical, particularly circular cylindrical, shank tools, including a fastening shank for establishing connection to a machine tool and a thermally expandable shrink section. The shrink section has an inside recess for accommodation of a tool shank and a pre-positioning section, which precedes the recess via a step and has an axial extension. The pre-positioning section is disposed eccentrically to the inside recess.

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Sigmaringen, Germany

Jochen Gruber