Inference device

An estimation device that, when a machine tool machines a polygon by controlling a relative position between a rotation axis of a rotary tool and a center axis of the polygon which is parallel to a rotation axis of a workpiece and passes through a predetermined position in the workpiece so that a positional relationship between the center axis of the polygon and the rotation axis of the rotary tool is kept constant, estimates whether interference will occur in the machine tool, the estimation device comprising:

• a reception unit that receives model information regarding a structure that constitutes the machine tool;
• a determination unit that, at a start of machining of the polygon, determines an initial position of the center axis of the polygon, an initial phase of the rotary tool, and a positional relationship between the center axis of the polygon and the rotation axis of the rotary tool;
• a calculation unit that calculates a moving range of at least one of the rotation axis of the rotary tool and the rotation axis of the workpiece, based on the initial position of the center axis of the polygon, the initial phase of the rotary tool, and the positional relationship between the center axis of the polygon and the rotation axis of the rotary tool which are determined by the determination unit;
• and
• an estimation unit that estimates whether interference will occur in the machine tool, based on the model information received by the reception unit and the moving range calculated by the calculation unit.