Tool and cutting insert for milling

A milling tool comprising a milling body adapted to be mounted in a milling machine, the milling body comprising at least one pocket having an axial inclination and shaped to receive a cutting insert formed of cemented carbide,

• the cutting insert comprising:
• an upper side constituting a chip surface,
• a lower side constituting a support surface,
• first and second major sides each intersecting the upper side, and
• first and second minor sides each intersecting the upper side and each interconnecting the first and second major sides;
• the insert further including a pair of cutting edges formed by the intersection of the upper side, the first major side and the first minor side,
• the pair of cutting edges comprising a major cutting edge extending along the first major side, and a minor cutting edge extending along the first minor side,
• the major cutting edge and the minor cutting edge intersecting one another to form a cutting corner,
• the major cutting edge sloping to form an acute angle with the lower side;
• the first major side and the first minor side forming a ledge structure underlying the pair of cutting edges, the ledge structure including a minor ledge underlying the minor cutting edge, and a major ledge underlying the major cutting edge, the minor ledge and the major ledge each forming an outwardly facing clearance surface, the minor ledge having a height less than a remaining height of the first minor side, and the major ledge having a height less than a remaining height of the first major side;
• the major ledge extending along at least a portion of the length of the first major side, a lower end of the major ledge being stepped outwardly with respect to a plane defined by a portion of the first major side disposed below the major ledge, a plane defined by the clearance surface of the major ledge being in non-intersecting relationship with a remaining portion of the major side disposed therebelow, whereby the clearance surface of the major ledge can be ground independently of the remaining portion of the major side,
• the minor ledge extending along only a portion of a length of the respective minor side, a lower end of the minor ledge being stepped outwardly with respect to a plane defined by a portion of the minor side disposed below the minor ledge, a plane defined by the clearance surface of the minor ledge being in non-intersecting relationship with a remaining portion of the minor side disposed therebelow, whereby the clearance surface of the minor ledge can be ground independently of the remaining portion of the minor side;
• each of the major sides having a recess formed therein.