Machining centers are used to carry out multiple operations like drilling, milling, boring etc. in one set up on multiple faces of the workpiece. These operations require a number of different tools. Tool changing operation is time consuming which reduces the machine utilization. Hence the tools should be automatically changed to reduce the idle time. This can be achieved by using automatic tool changer (ATC) facility. It helps the workpiece to be machined in one setup which increases the machine utilization and productivity. Large numbers of tools can be stored in tool magazines. Tool magazines are specified by their storage capacity, tool change procedure and shape. The storage capacity ranges from 12 to 200. Some of the magazines are discuseed as follows.

1.  Tool turret

It is the simplest form of tool magazine. Figure 4.6.1 the schematic of a turret with a capacity to hold twelve tools. It consists of a tool storage without any tool changer. The turret is indexed in the required position for desired machining operation. Advantage of the turret is that the tool can easily be identified, but the time consumed for tool change is more unless the tool is in the adjecent slot.

 

Fig. 4.6.1 Tool turret