Werkzeughalter für mindestens einen zustellbaren Schneideinsatz, insbesondere zur Bearbeitung von Ventilbohrungen eines Zylinderkopfes eines Verbrennungsmotors

A substantially conical tool body 1 has a groove 11 extending in the direction of generating line. The groove 11 slidably receives a slider 16 carrying a cutting insert 5A. A spacer 12 having serration grooves 12a is interposed between one wall surface 11a of the groove and the slider 16. Serration grooves 16a are formed in one side surface of the slider 16. A wedge member 13 is detachably interposed between the wall surface 11b of the groove 11 and the slider 16 so as to press the slider 16 to bring the serration grooves 12a+B, 16a into engagement with each other. Any wear and deformation due to cutting load appear on the spacer 12 and the wedge member 13, so that original mounting and positional precision of the slider 16 can easily be recovered by renewing these members, thus maintaining a required level of machining precision.