A cutting insert (22), longitudinally elongated in a direction defining an insert longitudinal axis (A), comprising:
- two opposing insert end surfaces (32) and an insert peripheral surface (30) extending therebetween about the insert longitudinal axis (A), the insert peripheral surface (30) comprising elongated opposing insert upper and lower surfaces (26, 28) and two opposing insert side surfaces (33) and connecting the insert upper and lower surfaces (26, 28), at least one of the insert end surfaces (32) having an integral cutting portion (34);
- an insert longitudinal plane (P1) containing the insert longitudinal axis (A) and passing midway in-between the two opposing insert side surfaces (33);
- an insert median plane (M) containing the insert longitudinal axis (A) and passing in-between the insert upper and lower surfaces (26, 28);
- an insert vertical axis (V) oriented perpendicular to the insert median plane (M) and contained in the insert longitudinal plane (P1);
- an insert lateral axis (L) oriented perpendicular to the insert longitudinal plane (P1) and contained in the insert median plane (M);
- at least one elongated insert engagement arrangement (40) formed on at least one of the insert upper surface (26) and the insert lower surface (28), the at least one insert engagement arrangement (40) extending longitudinally in a direction between the insert end surfaces (32) along an insert engagement arrangement longitudinal axis (I);
- wherein:
- the at least one insert engagement arrangement (40) comprises:
- an elongated insert engagement projection (42) which extends lengthwise along the insert engagement arrangement longitudinal axis (I), the insert engagement wedge surfaces (46) being located on opposite lateral sides of the insert engagement projection (42);
- two insert engagement grooves (44) extending lengthwise along opposite lateral sides of the insert engagement projection (42);
- and
- two insert engagement wedge surfaces (46) which extend along the insert engagement arrangement longitudinal axis (I) and which define an insert engagement angle (θ) by either:
- a) converging outwardly in a direction from the two insert side surfaces (33) so that the insert engagement angle (θ) is an internal angle;
- or
- b) converging inwardly in a direction from the two insert side surfaces (33) so that the insert engagement angle (0) is an external angle;
- the two insert engagement wedge surfaces (46) have an insert engagement height (H) measured in a direction of the insert vertical axis (V), the insert engagement height (H) being less than 0.5 mm;
- the two insert engagement wedge surfaces (46) each comprise an insert abutment surface (50), the insert engagement angle (θ) being defined between the insert abutment surfaces (50) and being greater than or equal to 90° and less than or equal to 110°;
- and
- the two insert engagement wedge surfaces (46) are spaced apart from each other in a lateral direction along the insert lateral axis (L) by an insert engagement lateral distance (d), the insert engagement lateral distance (d) being greater than five times the insert engagement height (H).