13-08-2015 дата публикации
Номер: US20150224580A1
A machine tool includes a table, a spindle head, a spindle, and an internal turning attachment. The internal turning attachment includes an attachment base, a body, and a tool holder. The tool holder has a tool mount surface to which a turning tool is detachably mounted. The tool mount surface provides a changeable tool mount angle with respect to a plane perpendicular to a spindle rotational axis in a state where the internal turning attachment is mounted to the spindle head. An angle between the spindle rotational axis and a vertical axis is to be larger than zero degree according to the changeable tool mount angle and is fixed while the turning tool contacts a workpiece in a case where the workpiece has a hole with a depth exceeding a length from a body upper portion to a tip end of the turning tool along the spindle rotational axis. 1. A machine tool comprising:a table having an upper face on which a workpiece is to be mounted and being rotatable around a vertical axis perpendicular to the upper face of the table;a spindle head disposed above the table and being rotatable around a horizontal axis parallel to the upper face of the table;a spindle disposed in the spindle head and being rotatable around a spindle rotational axis; and an attachment base having a base portion and a lower portion opposite to the base portion which is detachably mounted to the spindle head;', 'a body having a body upper portion and a body lower portion, the body upper portion being fixed to the lower portion of the attachment base; and', 'a tool holder mounted to the body lower portion, the tool holder having a tool mount surface to which a turning tool is detachably mounted, the tool mount surface providing a changeable tool mount angle with respect to a plane perpendicular to the spindle rotational axis in a state where the internal turning attachment is mounted to the spindle head, an angle between the spindle rotational axis and the vertical axis being to be larger than zero degree ...
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