Cutting tools for drilling concrete, aggregate, masonry or the like materials

A cutting tool for forming a hole in masonry material, comprising:

• a shank having a chucking end and a cutting head, an insert secured to said cutting head, a cutting edge on said insert, said cutting edge including at least one sharp cutting edge portion, a rake surface adjacent said at least one cutting edge portion, said rake face at a rake angle, said rake angle being from 0° to about 10°;
• a clearance face adjacent said at least one cutting edge portion opposing said rake face, and said sharp cutting edge portion defined by an edge radius between said rake face and clearance face, said edge radius having a desired radius.

An insert for a cutting tool for forming a hole in masonry material, comprising:

• a body, a cutting edge on said body, said cutting edge having at least one cutting edge portion;
• a rake face formed adjacent said at least one cutting edge portion, a clearance face adjacent said at least one cutting edge portion opposing said rake face, said clearance face on a clearance angle from about 20° to 40° and said rake face being at a rake angle and said rake angle being in the range of from −10° to about 10° with an edge radius between the rake face and clearance face, said edge radius having a radius in the range of about 0.0003 inch to 0.0030 inch.

A cutting tool for boring masonry material comprising:

• a shank having a chucking end and a cutting head, an insert in said cutting head, a cutting edge on said insert and defined by an edge radius, said cutting edge including at least one cutting edge portion, said cutting edge portion formed on a rake face and a clearance face, said rake face at a rake angle from about −10° to 10° and said clearance angle from greater than 14° and said edge radius being smaller than 0.003 inch.

A cutting tool comprising:

• a shank having a chucking end and a cutting head, an insert in said cutting head, a cutting edge on said insert, said cutting edge including at least one cutting edge portion, said cutting edge portion formed on a rake face and a clearance face;
• said cutting edge being defined by an edge radius, said edge radius being smaller than 0.003 inch and said clearance face at a clearance angle from about 20° to 40°.

A cutting tool for forming a hole in a masonry material, comprising:

• a shank having a chucking end and a cutting head, an insert in said cutting head, a cutting edge on said insert, said cutting edge including at least one cutting edge portion, a rake surface adjacent said at least one cutting edge portion, said rake face at a rake angle between −10° to 10°;
• a clearance face adjacent said at least one cutting edge portion opposing said rake face, said clearance face being at an angle from greater than 14°, and said cutting edge portion defined by an edge radius between said rake face and clearance face, said edge radius having a desired radius providing a sharp edge.

A cutting tool for forming a hole in a masonry material, comprising:

• a cutting head, a shank having a chucking end and an insert in said cutting head, a cutting edge on said insert, said cutting edge having at least one cutting edge portion;
• a rake face formed adjacent said at least one cutting edge portion, a clearance face adjacent said at least one cutting edge portion opposing said rake face, with an edge radius between the rake face and clearance face, said edge radius having a radius smaller than 0.003 inch and said clearance face being at an angle from about 24° to 40°.

A cutting tool for forming a hole in masonry material, comprising:

• a shank having a chucking end and a cutting head, an insert secured to said cutting head, a cutting edge on said insert, said cutting edge including at least one sharp cutting edge portion, a rake surface adjacent said at least one cutting edge portion, said rake face at a rake angle, said rake angle being from −10° to about 10°;
• a clearance face adjacent said at least one cutting edge portion opposing said rake face, said clearance face being on an angle from about 20° to 40° and said sharp cutting edge portion defined by an edge radius between said rake face and clearance face, said edge radius having a desired radius.

A cutting tool for forming a hole in masonry material, comprising:

• a shank having a chucking end and a cutting head, an insert secured to said cutting head, a cutting edge on said insert, said cutting edge including at least one sharp cutting edge portion, a rake surface adjacent said at least one cutting edge portion, said rake face at a rake angle, said rake angle in the range of from −10° to about 10°;
• a clearance face adjacent said at least one cutting edge portion opposing said rake face, said clearance face being on an angle from about 24° to 40° and said sharp cutting edge portion defined by an edge radius between said rake face and clearance face, said edge radius having a desired radius.