초록 ▼

A combined boring and milling tool has at least three triangularly shaped turnable cutter blades. The effective cutting edge of the first turnable cutter blade extends as bit (or drilling cutting edge) from the periphery of the shank at least to its axis. A second turnable cutter blade is offset 180

A combined boring and milling tool has at least three triangularly shaped turnable cutter blades. The effective cutting edge of the first turnable cutter blade extends as bit (or drilling cutting edge) from the periphery of the shank at least to its axis. A second turnable cutter blade is offset 180°peripherally from the first and its effective cutting edge extends as cutting edge on the periphery of the shank parallel to the shank axis. A third turnable cutter blade is offset axially from the first so that its effective cutting edge extends as a cutting edge parallel to the shank axis. The two effective cutting edges of the second and third turnable cutter blades lie on the same flight circle and their working ranges overlap axially. The first and third turnable cutter blades have a common chip space.

대표청구항 ▼

In a combined boring and milling tool, including a shank having cutting edges on its front end and on its periphery, the improvements comprised in that the cutting edges are respectively formed by one cutting edge each of turnable cutter blades each shaped like an equilateral triangle, a first said

In a combined boring and milling tool, including a shank having cutting edges on its front end and on its periphery, the improvements comprised in that the cutting edges are respectively formed by one cutting edge each of turnable cutter blades each shaped like an equilateral triangle, a first said turnable cutter blade being located on the front end of the shank so that its effective cutting edge extends as a bit radially inward from the periphery of the shank toward the shank axis, overlaps said shank axis slightly and slopes slightly rearward as it extends radially inward, a second said turnable cutter blade offset 180°peripherally from the first turnable cutter blade and located on the front end of the shank so that its effective cutting edge extends as a cutter edge parallel to the shank axis and projects slightly beyond the periphery of the shank.