A cutting tool includes a shaft portion having a cylindrical shape, a first protrusion protruding from the shaft portion toward an outer periphery and having a first cutting edge at an end portion of the outer periphery, a second protrusion protruding from the shaft portion toward the outer periphery and having a second cutting edge at an end portion of the outer periphery, and a first beam located away from the shaft portion and connected to the first protrusion and the second protrusion. The second protrusion is located behind the first protrusion with respect to a rotation direction of a rotation axis, and the first beam has a projecting shape protruding toward the outer periphery in a view at a side of the front end.

A cutting tool includes a shaft portion having a cylindrical shape, a first protrusion protruding from the shaft portion toward an outer periphery and having a first cutting edge at an end portion of the outer periphery, a second protrusion protruding from the shaft portion toward the outer periphery and having a second cutting edge at an end portion of the outer periphery, and a first beam located away from the shaft portion and connected to the first protrusion and the second protrusion. The second protrusion is located behind the first protrusion with respect to a rotation direction of a rotation axis, and the first beam has a projecting shape protruding toward the outer periphery in a view at a side of the front end.

The present cutting tool includes a rear end and a front end, with a longitudinal center axis extending from the front end to the rear end. The cutting tool further includes at least one chip-forming cutting edge for machining the workpiece, and a liquid supply conduit extending from the rear end to a nozzle rearward of the front working zone. The nozzle includes an inlet in fluid connection with the liquid supply conduit, and wherein the nozzle includes an outlet. The nozzle has a closed overall shape with an outer circumference that is larger than that of the radial location of the at least one cutting edge. The nozzle outlet is configured such that when liquid is supplied through the liquid supply conduit the liquid ejected from the outlet forms a liquid barrier to prevent chips formed during machining from escaping through the barrier.

The present cutting tool includes a rear end and a front end, with a longitudinal center axis extending from the front end to the rear end. The cutting tool further includes at least one chip-forming cutting edge for machining the workpiece, and a liquid supply conduit extending from the rear end to a nozzle rearward of the front working zone. The nozzle includes an inlet in fluid connection with the liquid supply conduit, and wherein the nozzle includes an outlet. The nozzle has a closed overall shape with an outer circumference that is larger than that of the radial location of the at least one cutting edge. The nozzle outlet is configured such that when liquid is supplied through the liquid supply conduit the liquid ejected from the outlet forms a liquid barrier to prevent chips formed during machining from escaping through the barrier.