Evaluation work piece and computer-readable storage medium

A non-transitory computer-readable storage medium storing a machining program for causing a computer as a numerical controller that produces an evaluation work piece by driving a machine tool to perform at least one of processes (a) to (g) as follows:

• (a) a process of decelerating tool when the tool moves along a lower flat surface toward a vertical level difference, accelerating and decelerating the tool at the vertical level difference, and accelerating the tool when the tool moves along an upper flat surface from the vertical level difference, and a process of decelerating the tool when the tool moves along the upper flat surface toward the vertical level difference, accelerating and decelerating the tool at the vertical level difference, and accelerating the tool when the tool moves along the lower flat surface from the vertical level difference;
• (b) a process of reversing a direction of movement of the tool in a height direction when the tool is used for machining of a three-dimensional object including a curved surface;
• (c) a process of changing a direction of movement of the tool at a corner part;
• (d) a process of moving the tool at a flat surface part;
• (e) a process of reciprocating the tool at a boundary part between a flat surface and a curved surface with a changing curvature;
• (f) a process of reciprocating the tool at a curved surface part having a curved surface with a changing curvature;
• and
• (g) a process of reciprocating the tool in such a manner that command points are aligned regularly between adjacent tool paths on a curved surface.

A non-transitory computer-readable storage medium storing a data structure for CAD data for use in a control system for a machine tool that produces an evaluation work piece by generating a machining program based on the CAD data and driving the machine tool, the data structure being for machining at least one of parts (A) to (G) of the evaluation work piece as follows:

• (A) a vertical level difference part having a vertical level difference and flat surfaces arranged on both sides of the vertical level difference;
• (B) a direction reversing part at which a direction of movement of a tool in a height direction is reversed when the tool is used for machining of a three-dimensional object including a curved surface;
• (C) a corner part at which a direction or movement of the tool changes;
• (D) a flat surface part;
• (E) a boundary part between a flat surface and a curved surface with a changing curvature;
• (F) a curved surface part having a curved surface with a changing curvature;
• and
• (G) a curved surface part at which command points are aligned regularly between adjacent tool paths on a curved surface.