Helical blade cutter

A helical blade cutter comprising at least one linear blade attached to an outer circumferential surface of a round body having an outer surface formed into a cylindrical circumferential surface and rotated in a circumferential direction, the at least one blade being arranged at a given interval in the circumferential direction of the outer circumferential surface, the at least one blade tilting to a given helix angle α from a straight line on the outer circumferential surface parallel to a rotational central axis, wherein

• a blade attachment surface is formed on the outer circumferential surface of the round body, the blade attachment surface tilting to an angle same as the helix angle α of the blade from the straight line on the outer circumferential surface parallel to the rotational central axis while tilting in a direction of an elevation angle from a tangent to the outer circumferential surface, the blade attachment surface being formed through intervention of a step resulting from the tilt in the direction of the elevation angle, and
• the blade is attached to a blade attachment part through intervention of a chip holder in a manner that allows detachment of the blade, the blade attachment part having an L shape in cross section resulting from being surrounded by the blade attachment surface and the step.