Cutting Insert

A cutting tool comprising:

• a main body provided with a pocket part, the pocket part including at least one side wall and bottom surface, the bottom surface of the pocket part forming a concave configuration as whole and including a pocket part base surface, a first pocket part inclined surface connected to an inner end of the base surface and inclined towards an inside of the main body, and a second pocket part inclined surface connected to an outer end of the base surface and inclined towards an outside of the main body;
• and
• a cutting insert seated in the pocket part, the cutting insert including an upper surface, a lower surface and side surfaces connecting the upper surface and the lower surface, the lower surface of the cutting insert forming a downwardly convex configuration as a whole and including an insert base surface, a first inclined surface inclined upwardly from a first end of the base surface towards a first side surface, and a second inclined surface inclined upwardly from a second end of the base surface towards a second side surface, wherein:
• the cutting insert is seated in the pocket part such that the second inclined surface of the cutting insert abuts the second pocket part inclined surface and the insert base surface is spaced apart from the pocket part base surface.

A cutting insert, comprising:

• an upper surface, a lower surface and side surfaces connecting the upper surface and the lower surface, the lower surface of the cutting insert forming a downwardly convex configuration as a whole and including an insert base surface, a first inclined surface inclined upwardly from a first end of the base surface to a first side surface, and a second inclined surface inclined upwardly from a second end of the base surface to a second side surface;
• and
• a penetrating opening passing between the upper surface and lower surface, around which penetrating opening the cutting insert has a rotation-symmetry of 180 degrees;
• wherein:
• an angle between the second inclined surface and the base surface is approximately between 160 and 170 degrees.