Numerical control device

A numerical control device comprising:

• processing circuitry configured to
• calculate a tolerance according to a rotation-axis angle on the basis of a reference tolerance according to the rotation-axis angle and of a tolerance magnification;
• determine, on the basis of the tolerance according to the rotation-axis angle and rotation-axis angles before smoothing, a tolerance for correction amounts for the rotation-axis angles;
• smooth the rotation-axis angles before smoothing so that change in the rotation-axis angle becomes smooth, thereby calculating rotation-axis angles after smoothing;
• and
• correct the rotation-axis angle after smoothing so as to fall within the tolerance for correction amounts for rotation-axis angles from the rotation-axis angles before smoothing, wherein the processing circuitry performs smoothing with specified angle values for which the tolerance for rotation-axis angle correction amounts is greater than or equal to a predetermined value being excluded.

A method, implemented on a numerical control device, comprising:

• accepting a tolerance for correction amounts for tool-attitude vectors;
• determining, on the basis of tool attitudes calculated from rotation-axis angles before smoothing and of the tolerance for correction amounts for tool-attitude vectors, a tolerance for correction amounts for the rotation-axis angles;
• smoothing the rotation-axis angles before smoothing so that change in the rotation-axis angle becomes smooth, thereby calculating rotation-axis angles after smoothing;
• and
• correcting the rotation-axis angles after smoothing so as to fall within the tolerance for correction amounts for rotation-axis angles from the rotation-axis angles before smoothing.