The Best Advice a Senior Engineer Gave Me About Deep Hole Drilling
Early in my career, a senior engineer watched me setting up a gun drilling job. I was fussing with the cutting parameters. Should the feed be 0.04 or 0.05 mm/rev? Should the speed be 3000 or 3500 RPM? He watched for a minute and said: “You are worrying about the wrong things. Check the coolant pressure first. If the pressure is not right, nothing else matters.” He was right. I have seen more deep hole drilling problems caused by coolant pressure than by any other single factor. Worn tools, misalignment, and wrong parameters are easier to fix than chip packing from low coolant pressure. ...