Typical of a large-scale tooling complement with a heavy-duty tool change mechanism is the one illustrate in the cnc machines, cnc milling machine, cnc machining center. Where the whole assembly can be appreciated. This assembly will form the basis of an explanation in a step-by-step manner of the actual tool changing sequence, whilst the machine tool continues performing the cutting operations, the magazine is rotated by the shortest route until the required pocket appears at the tool change position - in this case a twist drill will be the next tool chosen. 

The machining is completed and the double tool change arm removes the drill from the pocket  and slides down to the position where tool changing can begin and whilst this is occurring the magazine rotates to the empty pocket which is ready to receive the slot drill. the photograph shows how the double tool change arm has swung through 900 and gripped the slot drill in the machine's spindle. 

The double arm then indexes through 1800, after the hydraulic draw-bar has released the pull stud on the tool adapter and lifted clear of the spindle nose . It places the twist drill into the spindle nose, then it is free to withdraw from the vicinity swinging back to the tool chain to place the slot drill into its correct pocket, so that cutting can recommence. 

Do you agree with what written above concerning to milling machine?