Rotationally asymmetric cutting insert having a single radially extending cutting-edge portion and rotary cutting tool

A rotary cutting tool (64) comprising:

• a tool shank (66) extending along a shank axis (AS) defining a shank forward-rearward direction (SF, SR), the tool shank (66) comprising circumferentially spaced apart first and second protuberances (68, 70) protruding axially from a forward end portion (72) thereof and an insert receiving slot (74) located between the first and second protuberances (68, 70);
• and
• a rotationally asymmetric cutting insert (20) rotatable about an insert axis (AI) in a direction of cutting rotation (RC), the insert axis (AI) defining an insert forward-rearward direction (IF, IR), the cutting insert (20) comprising;
• opposing front and rear surfaces (22, 24) interconnected by an insert peripheral surface (26), the insert peripheral surface (26) having first and second side surfaces (28, 30) spaced apart by first and second land surfaces (32, 34),
• a first land edge (36) extending rearwardly from the front surface (22) along the first land surface (32),
• a second land edge (38) extending rearwardly from the front surface (22) along the second land surface (34);
• a first front edge (46) formed at the intersection of the front surface (22) and the first side surface (28), the first front edge (46) including a radially extending cutting-edge portion (48);
• and
• a second front edge (52) formed at the intersection of the front surface (22) and the second side surface (30), the second front edge (52) being devoid of a cutting-edge portion,
• wherein:
• the first side surface (28) includes a rake surface (50) adjacent the cutting-edge portion (48), the rake surface (50) facing in the direction of cutting rotation (RC);
• the first and second land edges (36, 38) are contained in an envelope surface (40) of an imaginary first cylinder (C1) having a circular cross-section and a cylinder axis (AC) coaxial with the insert axis (AI), the imaginary first cylinder (C1) having a first diameter (D1), and
• an imaginary cutting profile (PC) formed by rotating the cutting-edge portion (48) 360 degrees about the insert axis (AI) is located axially forward of the second front edge (52) and defines a cutting diameter (DC) which corresponds to the first diameter (D1);
• wherein:
• the cutting insert (20) is releasably secured to the tool shank (66) in the insert receiving slot (74);
• the insert axis (AI) is coaxial with the shank axis (AS);
• and
• the insert's front surface (22) faces in the shank forward direction (SF).

A rotationally asymmetric cutting insert (20) rotatable about an insert axis (AI) in a direction of cutting rotation (RC), the insert axis (AI) defining an insert forward-rearward direction (IF, IR), the cutting insert (20) comprising;

• opposing front and rear surfaces (22, 24) interconnected by an insert peripheral surface (26), the insert peripheral surface (26) having first and second side surfaces (28, 30) spaced apart by first and second land surfaces (32, 34),
• a first land edge (36) extending rearwardly from the front surface (22) along the first land surface (32),
• a second land edge (38) extending rearwardly from the front surface (22) along the second land surface (34);
• a first front edge (46) formed at the intersection of the front surface (22) and the first side surface (28), the first front edge (46) including a radially extending cutting-edge portion (48) extending radially outwardly to the first land edge (38);
• and
• a second front edge (52) formed at the intersection of the front surface (22) and the second side surface (30), the second front edge (52) being devoid of a cutting-edge portion,
• wherein:
• the first side surface (28) includes a rake surface (50) adjacent the cutting-edge portion (48), the rake surface (50) facing in the direction of cutting rotation (RC);
• the first and second land edges (36, 38) are contained in an envelope surface (40) of an imaginary first cylinder (C1) having a circular cross-section and a cylinder axis (AC) coaxial with the insert axis (AI), the imaginary first cylinder (C1) having a first diameter (D1);
• an imaginary cutting profile (PC) formed by rotating the cutting-edge portion (48) 360 degrees about the insert axis (AI) is located axially forward of the second front edge (52) and defines a cutting diameter (DC) which corresponds to the first diameter (D1),
• the first land edge (36) extends rearwardly from a first end point (N1),
• the first end point (N1) and the insert axis (AI) are contained in a first insert plane (PI1), and
• no portion of the cutting insert (20) crosses the first insert plane (PI1).