Numerical controller and numerical control method for NC machine tools

A numerical control method for NC machine tools to perform a contour describing control, comprising:

• calculating a permissible range of a physical index representing one of a velocity and an acceleration of a tool, wherein the velocity has a normal component thereof normal to an orbit of the contour describing control and variable depending on an S pattern and the physical index represents a normal component of the acceleration normal to the orbit;
• and
• controlling the physical index within the permissible range.

A numerical control method for NC machine tools to perform a contour describing control, comprising:

• calculating a permissible range of a physical index representing one of a velocity and an acceleration of a tool, wherein the acceleration has a normal component thereof normal to an orbit of the contour describing control and variable depending on an angle of rotation of the tool, and the physical index represents the normal component of the acceleration;
• and
• controlling the physical index within the permissible range.

A numerical controller for NC machine tools to perform a contour describing control, comprising:

• a calculator for calculating a permissible range of a physical index representing one of a velocity and an acceleration of a tool, wherein the velocity has a normal component thereof normal to an orbit of the contour describing control and variable depending on an S pattern, and the physical index represents a normal component of the acceleration normal to the orbit;
• and
• a controller for controlling the physical index within the permissible range.

A numerical controller for NC machine tools to perform a contour describing control, comprising:

• a calculator for calculating a permissible range of a physical index representing one of a velocity and an acceleration of a tool, wherein the acceleration has a normal component thereof normal to an orbit of the contour describing control and variable depending on an angle of rotation of the tool, and the physical index represents the normal component of the acceleration;
• and
• a controller for controlling the physical index within the permissible range.