Drill insert geometry having V-notched web

A drill insert comprising:

• a drill insert body having at least a first side and a second side;
• wherein the second side comprises at least two cutting edges formed transverse to each other, a web formed between the two cutting edges, and a web thinning notch formed on either side of the web;
• wherein each notch forms a notch cutting edge having a positive rake angle;
• wherein each notch has a cross-sectional geometry in the form of a “V” having an apex of the notch formed at a first radius and at least one of a leading notch side wall and a trailing notch side wall is formed at least partially as a second radius;
• wherein at least a portion of the leading notch side wall is substantially planar.

A drilling tool assembly comprising:

• a holder having first and second ends and a rotational axis, wherein the second end is adapted to be fixedly attached in a drilling machine, and the first end comprises a holder slot having a bottom seating surface over at least a portion of the holder slot, the holder slot also including a locating boss extending from the bottom seating surface,
• a drill insert comprising a first and a second side, at least two cutting edges formed transverse to each other on the second side, a web between the two cutting edges, and a web thinning notch formed on either side of the web, wherein each notch forms a notch cutting edge having a positive rake angle, and wherein each notch has a cross-sectional geometry in the form of a “V” having an apex of the notch formed at a first radius and at least one of a leading notch side wall and a trailing notch side wall is formed at least partially as a second radius, wherein the first radius is smaller than the second radius;
• and
• wherein the first side of the drill insert body is adapted to have at least a portion thereof positioned in the holder slot in seating engagement with the bottom seating surface and including a locating slot formed in the bottom side which cooperates with the locating boss of the bottom seating surface to allow the insert to be seated against the bottom seating surface.