NC machine tool with tiltable spindle unit

摘要

There is provided an NC machine tool with tiltable spindle unit capable of being used both as vertical and inclined spindle type machine tools without restrictions on stroke and capable of easily carrying out tool measurement, alignment of a work piece with a tool, and truing. The NC machine tool includes: a spindle unit having a spindle serving both as a vertical spindle and an inclined spindle; and a tilting mechanism having a turning shaft for pivotably supporting the spindle unit on a vertical plane. The turning shaft has a center line of rotation which is arranged in the vicinity of a top end of a tool on a center line of the tool.