Patent ID: 7448304
Filing Date: 2008-11-11
Classification: B23B,B23F,B23Q,Y10T

Abstract:
1. A lathe comprising: a main spindle which grips and rotates a work, and is reciprocatable in a Z direction which is parallel with an axis of rotation of said work; a back spindle which is positioned oppositely to said main spindle, grips and rotates a work, and is reciprocatable in the Z direction; a tool spindle which has an only one, exchangeably attached tool for machining said work, is reciprocatable in the Z direction and also reciprocatable in an X direction different from the Z direction, and rotates in an X-Z plane including the Z direction and the X direction to change a direction of said tool; a guide bush which rotatably supports said work projecting from said main spindle, and slides said work in a direction of axis of said work; a tool magazine which contains a plurality of tools; and a tool exchange mechanism which exchanges said tool which has been attached to said tool spindle, with another tool contained in said tool magazine, wherein said main spindle comprises a hole through which said work penetrates, so that said work can be gripped by said main spindle and can extend by penetrating through said hole, and said back spindle comprises a hole through which said work penetrates, so that said work can be gripped by said back spindle and can extend by penetrating through said hole.