Automatic lathe

An automatic lathe which has a tool post and a spindle configured to relatively move in a spindle axis line direction and which machines a material gripped by a spindle chuck at the tip of the spindle by use of a tool installed on the tool post, the automatic lathe characterized by comprising:

• a head stock configured to move forward and backward;
• the spindle rotatably supported on the head stock and having a through-hole formed for the rod-like material to be inserted therethrough;
• spindle driving means which is provided in the head stock to rotate the spindle;
• the tool post equipped with a tool to machine the material gripped by the spindle chuck;
• a guide bush support table disposed closer to a tip side of the spindle than the head stock;
• support table fixing means for positioning and fixing the guide bush support table at a specified position of a bed;
• a guide member which is rotatably supported on the guide bush support table and which is regulated so as not to move forward and backward with respect to the guide bush support table and in which a through-hole is formed to insert the spindle therein;
• a guide bush detachably fitted to the tip of the guide member;
• guide bush driving means which is provided in the guide bush support table to rotate the guide member together with the guide bush;
• spindle moving means for moving the spindle forward and backward together with the head stock inside the guide member;
• spindle fixing means for preventing the spindle from moving forward and backward with respect to the guide bush support table, and positioning and fixing the spindle at a specified position on the guide bush support table when the guide bush is removed from the guide member;
• and
• control means for performing synchronous control of the spindle driving means and the guide bush driving means when machining the material by use of at least the guide bush.