Machining simulation apparatus, numerically controlled lathe, machine tool system, and method for machining workpiece

A numerically controlled lathe comprising:

• a spindle rotatable around a first axis;
• a chuck connected to the spindle to be rotatable together with the spindle around the first axis;
• a plurality of jaws mounted on the chuck to be rotatable together with the spindle around the first axis and configured to grip a workpiece;
• a rotary driver configured to rotate the spindle about the first axis;
• a motion driver configured to move a first tool which is configured to machine the workpiece;
• a second memory configured to store a machining program;
• a second communication circuit configured to receive, from a machining simulation apparatus, data indicating a position of a program origin that is an origin on a machining simulation coordinate system of the numerically controlled lathe, the machining simulation apparatus being configured to set the position of the program origin based on a machine model origin on the machining simulation coordinate system, a jaw model that is a shape model of the plurality of jaws, and a workpiece model that is a shape model of the workpiece, machine model origin corresponding to a machine origin of the numerically controlled lathe, the machining simulation apparatus being configured to execute the machining program using the program origin as a reference position to virtually machine the workpiece model;
• and
• a second processor configured to set a position of a machining program origin in a machining program coordinate system based on the position of the program origin and configured to determine a movement path of the first tool with respect to the machining program origin by executing the machining program.

A method for machining a workpiece, the method comprising:

• setting a position of a program origin, that is an origin on a machining simulation coordinate system of a numerically controlled lathe, based on a machine model origin on the machining simulation coordinate system, a jaw model that is a shape model of a plurality of jaws mounted on a chuck of the numerically controlled lathe, and a workpiece model that is a shape model of a workpiece to be gripped by the plurality of jaws, the machine model origin corresponding to a machine origin of the numerically controlled lathe;
• executing the machining program using the program origin as a reference position to virtually machine the workpiece model;
• setting a position of a machining program origin in a machining program coordinate system based on the position of the program origin;
• and
• executing the machining program using the machining program origin as a reference position to machine the workpiece by the numerically controlled lathe.