Machine Set up for Hard Turning

The key is to maximize rigidity. You should attempt to achieve the smallest possible tool overhang, and spindle rotation should put cutting forces into the machine bed. Stop cutting if chatter occurs. Coolant (spray mist or flood) is appropriate for continuous cutting--you can achieve up to a 20% increase in tool life with high-pressure coolants. Spray mist is often used in Europe, due to the high cost of disposal (since less coolant is used in all applications), and dry machining is being investigated aggressively in Europe. For intermittent cutting, do not use coolant. Dry cutting may benefit from the application of compressed refrigerated air.