Tool for machining a workpiece

Tool for machining a workpiece, comprising:

• a holder which extends along a longitudinal axis and comprises a first internal coolant duct;
• a cutting insert having a main cutting edge;
• a first fastening element which is configured to releasably fasten the cutting insert to the holder;
• a plate-like coolant guiding attachment having a second internal coolant duct;
• and
• a second fastening element which is configured to releasably fasten the coolant guiding attachment to the holder;
• wherein, in an assembled state of the tool, the first internal coolant duct is fluidically connected to the second internal coolant duct and the coolant guiding attachment covers at least a part of the cutting insert,
• wherein the coolant guiding attachment comprises a first opening, which is configured as a recess or through-opening and allows access to the first fastening element, such that the cutting insert is separately releasable from the holder by releasing the first fastening element even when the coolant guiding attachment is fastened to the holder, and the coolant guiding attachment is separately releasable from the holder by releasing the second fastening element even when the cutting insert is fastened to the holder,
• wherein the second internal coolant duct comprises a first coolant outlet opening and a second coolant outlet opening at which coolant leaves the second internal coolant duct, wherein the first and the second coolant outlet opening are arranged on a front side of the coolant guiding attachment on opposite sides of the first opening, wherein said front side of the coolant guiding attachment faces the main cutting edge,
• wherein the first coolant outlet opening is arranged at a first distance from an imaginary reference plane which is oriented perpendicularly to the longitudinal axis of the holder and in which a central axis of the second fastening element is located, wherein the second coolant outlet opening is arranged at a second distance from the imaginary reference plane, wherein a central axis of the first fastening element is arranged at a third distance from the imaginary reference plane, and wherein at least one point on the main cutting edge is arranged at a fourth distance from the imaginary reference plane, and
• wherein the following applies:
• third distance≤second distance≤first distance<fourth distance.