Preferably used for parts with many machining operations and high volume. The number of machining units depends on the part. Normally the indexing plate is horizontally build. If parts require machining operations on 3 or......Preferably used for parts with many machining operations and high volume. The number of machining units depends on the part. Normally the indexing plate is horizontally build. If parts require machining operations on 3 or more different sides the vertical indexing plate will come in action (Drum Machine).