Abstract: A honing tool for machining a workpiece bore (40) in one working stroke with honing coatings (22) set in fixed manner to the desired size of the bore, has on a non-readjustable part of the tool body (12) and preferably in the vicinity of a guide zone (28), air measuring nozzles (33). During the tool return stroke, these nozzles are subject to an action through the bore and measure the final size of the latter following the working zone (24). Optionally a readjustment can be automatically initiated as a function of the result.

Abstract: A device for drilling an undercut in a borehole formed into a substrate includes a housing (1) containing a guide sleeve (2) with a bushing (4) arranged eccentrically within and rotatable relative to the guide sleeve. A torsion spring (6) is located between the guide sleeve and the bushing and is stressed when the bushing rotates relative to the sleeve. A drive shaft (8) with a cutter head (9) at one end is supported in the bushing and can be moved from a centered position into an eccentric position relative to the guide sleeve for forming the undercut. The rotational drive of the bushing (4) is afforded by the drive shaft (8) via an eccentric gear train. Furthermore, the gear train includes an internal ring gear (23) couplable to a gear train housing (19) by a wrap-around spring (31).

Abstract: A cutting insert for use in a peripheral rotary milling cutter having a cylindrical holder and at least one replaceable, peripherally disposed cutting inserts, the cutting insert being formed with at least one cutting edge defined between a cutting rake surface and a relief flank surface of the insert. The cutting rake and relief flank surfaces are continuously curved so that the insert rake and relief angles as defined with respect to the cylindrical holder remain substantially invariant along the length of the cutting edge.

Abstract: The invention relates to a cutting tool, particularly a carving insert or cutter bit, which is exchangeable in tool holders in each case has a cutting wedge, which is adjacent to a face, one or several nubs in the form of spherical segments, truncated cones and/or truncated pyramids being formed on the face.