Have you noticed that when you take a very small cut on the lathe. This is done all the time in some shops today. 003 of material and the last cut to hold size and finish. You might set the lathe up for only two cuts. If you were cutting thread all day long: day in and day out. One to remove excess material quickly: the rough cut, one cut to establish finish and to allow for tool pressure, and one to finish the cut. ![]() It has been my experience to take at least three cuts. ![]() Our textbook recommends whenever possible, only two cuts should be taken to bring a diameter to size: a roughing cut and a finishing cut. We can control the feed on an engine lathe by using the change gears in the quick-change gearbox. We can find these cutting speeds and metal removal rates in our appendix or in the Machinery’s Handbook. In order to eliminate this time loss, we can, and should, use recommended metal-removal rates that have been researched and tested by steel and cutting-tool manufactures. A lot of time can be lost if the machines are not set at the proper speed and feeds for the workpiece. To operate any machine efficiently, the machinist must learn the importance of cutting speeds and feeds. ![]()
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