Machine tool and cutting method

A machine tool for cutting a workpiece having an inclined surface comprising:

• a main spindle that rotates while holding the workpiece;
• a tool post that holds a cutting tool to cut the inclined surface of the workpiece;
• and
• a mover that relatively moves the workpiece and the cutting tool in a direction including at least a Y-direction perpendicular to both a Z-direction parallel to an axis of the main spindle and an X-direction perpendicular to the Z-direction and determines an amount of cutting of the workpiece, wherein
• the mover comprises a Y-direction guide disposed on the tool post, the Y-direction guide guiding movement of the cutting tool in the Y-direction, and
• the Y-direction guide has a guide surface along a surface perpendicular to a direction of a thrust force that occurs when cutting the inclined surface using the cutting tool.

A machine tool for cutting a workpiece having an inclined surface comprising:

• a main spindle that rotates while holding the workpiece;
• a tool post that holds a cutting tool to cut the inclined surface of the workpiece;
• and
• a mover that relatively moves the workpiece and the cutting tool in a direction including at least a Y-direction perpendicular to both a Z-direction parallel to an axis of the main spindle and an X-direction that is perpendicular to the Z-direction and determines an amount of cutting of the workpiece, wherein
• the mover comprises a Y-direction guide disposed on the tool post, the Y-direction guide guiding movement of the cutting tool in the Y-direction, and
• at least one of the main spindle and the tool post is configured to rotate around an axis parallel to the Y-direction so that a guide surface of the Y-direction guide becomes perpendicular to a direction of a thrust force that occurs when cutting the inclined surface using the cutting tool.

A method for cutting a workpiece having an inclined surface comprising:

• holding the workpiece on a main spindle and rotating the workpiece around the main spindle;
• causing a cutting tool held by a tool post to correspond to the inclined surface of the workpiece;
• and
• cutting the inclined surface by moving the cutting tool relative to the workpiece in a direction including at least a Y-direction perpendicular to both a Z-direction parallel to an axis of the main spindle and an X-direction perpendicular to the Z-direction and determines the amount of cutting of the workpiece, wherein
• the cutting tool is caused to correspond to the inclined surface of the workpiece by rotating at least one of the main spindle and the tool post around an axis parallel to the Y-direction.