Cutting insert with radially aligned chip forming grooves

A cutting insert having an upper surface, a lower surface and side surface, said insert comprising:

• at least one cutting edge formed at an intersection between the upper surface and one side surface, said at least one cutting edge extending between two adjacent cutting corners of said insert;
• at least one rake face adjacent said at least one cutting edge;
• a first undulated chip forming groove being formed on said at least one rake face and extending along said at least one cutting edge, said first undulated chip forming groove comprising alternating depressed and raised portions smoothly merging with one another and extending from said side surface through said at least one cutting edge and;
• a seating surface projecting above the cutting corners of said insert;
• and
• a second undulated chip forming groove extending along said seating surface, said second undulated chip forming groove comprising alternating depressed and raised portions smoothly merging with one another,
• wherein each depressed and raised portion of the first and second chip forming grooves is radially aligned with a central axis of said insert.

A cutting insert having a central axis, an upper surface, a lower surface and side surface, said insert comprising:

• a first undulated chip forming groove formed on the upper surface at a first radial distance from the central axis, said first undulated chip forming groove comprising alternating depressed and raised portions;
• and
• a second undulated chip forming groove formed on the upper surface at a second radial distance from the central axis, the second radial distance being different than the first radial distance, said second undulated chip forming groove comprising alternating depressed and raised portions,
• wherein each depressed and raised portion of the first and second chip forming grooves is radially aligned with the central axis of said insert.