It should be obvious to anyone who has ever washed a driveway or patio with a garden hose: For the best results, you must keep the stream of water precisely where it's needed. The same principle applies to delivering coolant to the cutting zone.
Think 'unattended machining,' and the image in your mind is probably complex - that is, some machining process that relies on automation more than the typical machining process does. But does going unattended have to involve this complexity? Instead of requiring automation, allowing the operator to step away from the machine tool might just be a matter of addressing the sources of worry that keep that operator engaged.
The right tools for Swiss machines can boost throughput and improve the quality of finished parts. For example, switching from brazed carbide parting tools to more wear resistant coated carbide inserts with sharper edges reduced cycle time on an automotive fluid connector from 11 seconds to just 5 seconds.