Method for calibrating parameters of surface texture measuring apparatus

A method for calibrating parameters that calibrates at least one of a parameter L corresponding to an arm length and a parameter H corresponding to a stylus length using a surface texture measuring apparatus provided with:

• a stylus that contacts a measurable object;
• an arm provided with the stylus and supported by a rotary shaft so as to freely rotate;
• a displacement amount detection device detecting a displacement amount of the stylus in a first direction associated with rotating the arm;
• a relative movement mechanism that moves the stylus relative to the measured object such that the stylus scans the measured object in a second direction which is orthogonal to the first direction;
• a movement amount detection device detecting a relative movement amount of the stylus with respect to the measured object;
• and
• a measurer that obtains measurement data based on the displacement amount and the relative movement amount,
• the method comprising:
• obtaining the measurement data by scanning a surface that has one of a planar shape or a shape of a portion of a spherical surface that changes in each of the first direction and the second direction;
• obtaining corrected data by correcting the measurement data based on the parameter L and the parameter H;
• calculating one of roundness or straightness of the corrected data and to determine whether the calculated one of roundness or straightness is less than or equal to a predetermined value;
• and
• one of increasing or reducing at least one of the parameter L and the parameter H when the one of roundness or the straightness is determined to be greater than the predetermined value, and
• repeating the obtaining corrected data, the calculating one of roundness or straightness, and the one of increasing or reducing, until the one of roundness or the straightness is determined to be less than or equal to than the predetermined value in the calculating one of roundness or straightness.