Abstract: A cutting insert is clamped in a pocket of a holder by a top clamp assembly which includes a clamp arm screwed to the holder, and a clamp plate interposed between the insert and a front part of the clamp arm. The clamp plate is formed of a harder and more wear-resistant material than the clamp arm and transmits clamping forces from the clamp arm to the cutting insert. The hard clamp plate shields the clamp arm from being impacted by chips generated during a machining operation, thereby minimizing wearing of the clamp arm.

Abstract: A metal cutting tool includes a holder arrangement, an indexible cutting insert seated on an insert-receiving site of the holder arrangement, and a screw for fastening the insert to the site. The bottom side of the insert includes more than two upright abutment surfaces arranged to abut respective upright support surfaces of the site, whereby the areas of contact formed by the mutually abutting surfaces lie inside of an outer perimeter of the insert. The abutment surfaces are oriented non-parallel to one another. The screw is arranged to urge the insert in a direction whereby less than all of the abutment surfaces abut respective support surfaces, and at least one abutment surface does not abut a support surface. When the insert is indexed, the non-abutting abutment surface is relocated and caused to abut a support surface when the screw is tightened, while an abutment surface that previously abutted a support surface becomes a non-abutting surface.

Abstract: A tool for parting or grooving includes a holder to which is mounted an adapter having an insert-receiving slot formed between support and clamping portions of the adapter. The holder includes a serration meshing with a serration of the adapter. Threaded holes are formed through the serration of the holder, and through-holes are formed in the adapter in alignment with respective holes of the holder. Screws extend through the aligned through-hole and threaded hole to secure the adapter to the holder. A slot intersects through one of the through-holes of the adapter to render the clamping portion elastically deformable. That through-hole includes a conically-shaped entrace surface, and the associated screw includes a conical head which acts as a wedge to force the clamping portion into clamping engagement with the insert.

Abstract: A metal cutting tool includes a holder arrangement, an indexible cutting insert seated on an insert-receiving site of the holder arrangement, and a screw for fastening the insert to the site. The bottom side of the insert includes more than two upright abutment surfaces arranged to abut respective upright support surfaces of the site, whereby the areas of contact formed by the mutually abutting surfaces lie inside of an outer perimeter of the insert. The abutment surfaces are oriented non-parallel to one another. The screw is arranged to urge the insert in a direction whereby less than all of the abutment surfaces abut respective support surfaces, and at least one abutment surface does not abut a support surface. When the insert is indexed, the non-abutting abutment surface is relocated and caused to abut a support surface when the screw is tightened, while an abutment surface that previously abutted a support surface becomes a non-abutting surface.