Abstract: The present invention relates to a substrate plate for a double-sided indexable cutting insert, which is to be fixed within a tool to be equipped with at least one cutting insert, where the tool has at least one seat for at least one indexable cutting insert, where the substrate plate has a plate-like fundamental shape with a round or polygonal outline and with a lower contact area, generally planar, which can be placed in contact with one area of the seat, and with an upper support area bearing the indexable cutting insert, where the contact area and support area have connection to one another via side walls defining the periphery of the substrate plate.

Abstract: The present invention relates to a substrate plate for a double-sided indexable cutting insert, which is to be fixed within a tool to be equipped with at least one cutting insert, where the tool has at least one seat for at least one indexable cutting insert, where the substrate plate has a plate-like fundamental shape with a round or polygonal outline and with a lower contact area, generally planar, which can be placed in contact with one area of the seat, and with an upper support area bearing the indexable cutting insert, where the contact area and support area have connection to one another via side walls defining the periphery of the substrate plate.

Abstract: In a lathe tool composed of a holder and a reversible cutting plate for cutting a groove or thread, the holder being formed to have a recess for accommodating the cutting plate, the recess having a bottom face and a side face, and the cutting plate having a longitudinal dimension, two longitudinal spaced frontal end faces each having a cutting edge, a narrow longitudinally extending edge extending between the frontal end faces and arranged to bear against the bottom face of the recess, a longitudinally extending broad side extending between the frontal end faces and transversely to the narrow edge and arranged to bear against the side face of the recess, and a fastening bore having an axis extending transversely to the broad side, the lathe tool further including a clamping device for holding the cutting plate in the recess with the narrow edge and broad side of the cutting plate bearing against the bottom face and side face, respectively, of the recess, wherein the clamping device includes a clamping element