Method of setting heat-resistant alloy cutting conditions and method of cutting heat-resistant alloy

A method of setting a heat-resistant alloy cutting condition that is used to set a cutting condition under which a heat-resistant alloy is cut with a cutting tool mounted on a spindle, the cutting tool being an end mill including a shaft mounted on the spindle and extended in an axial direction and a plurality of teeth disposed on an outer circumference of the shaft, and

• the cutting condition includes a radial direction cutting amount in a radial direction of the cutting tool, the method comprising
• when the radial direction cutting amount in which one of the teeth is constantly in contact with the heat-resistant alloy is given as a smallest radial direction cutting amount, and
• the radial direction cutting amount in which three or more teeth of the teeth are not in contact with the heat-resistant alloy is given as a largest radial direction cutting amount,
• setting the radial direction cutting amount of the cutting tool in a range from the smallest radial direction cutting amount to the largest radial direction cutting amount, wherein
• when a when a length of projection of the cutting tool from the spindle is given as L, a tool diameter of the cutting tool is given as D, and the number of teeth of the cutting tool is given as N,
• the cutting condition includes conditions that (L/D)×N is from 40 to 120 for L/D being 3.5 to 5, and (L/D)×N is equal to or greater than 90 for L/D being larger than 5.