Grooving on the Lathe - 10: Parting
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.

Cutting off or parting is the actual separation of one piece of material into two by means of the grooving operation. Actually, the operator continues to remove stock from the work until the grooving tool passes the centerline of the part, thus causing the piece to separate into two. Of extreme caution is chip removal. As the tool goes further and further into the work, it becomes increasingly difficult for the chips to exit the groove. Again, frequent removal of the tool bit will alleviate this concern.

I recall quite vividly my first effort in parting off a few blanks on a lathe. I was probably 17 or 18 at the time and was having terrible difficulty with the process. I was getting a lot of chatter and making some really loud noises when over walked the leadman. Without a word he motioned to me step back from the lathe while he stepped in and proceeded to part off the bar without any chatter or noise and with a perfect chip curl. He then walked away without saying a word. I think it was at that point in time that I realized how much expertise machinists have in their heads and hands and how difficult it is to extract the same from text. Having a mentor to watch you and teach you is surely the best way to learn this skill. R.S.
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label: lathe gorove, grooving, cutting tool, setup, feeds and speeds, cuttting, widening, measuring, parrting cuttting off