Chip-controlling insert

A cutoff insert comprising:

• a cutting edge;
• a top;
• a curved rake surface extending from the cutting edge to said top;
• and
• said rake surface waving a channel, substantially narrower than the cutting edge, intersecting said top add said cutting edge, forming a central notch in said cutting edge.

An improved insert for a cutoff tool comprising:

• an elongated body portion;
• a cutting edge at one end of the body portion;
• a top portion including a top surface disposed above and back from said cutting edge;
• a chip forming shelf extending rearward and upward from said cutting edge to said top surface;
• and
• said having a channel extending through said cutting edge, said chip forming shelf and at least a portion of said top surface, said channel being substantially narrower than and located centrally of said cutting edge.

An improved cutoff tool insert comprising:

• a top surface;
• a cutting edge disposed forward and beneath said top surface;
• a chip-forming surface extending from said cutting edge upward to said top surface;
• a front surface extending downward from said cutting edge;
• opposed side walls extending rearward from the edges of said front surface and converging downward with respect to said top surface;
• a generally V-shaped bottom extending rearward from said front surface and upward toward said opposed side walls;
• and
• said chip forming surface having a longitudinal channel, substantially narrower than and located centrally of the cutting edge, extending through said cutting edge and at least into said top surface.