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internal turning

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Internal turning - or 'boring' describes the stages of lathe-work where 'inside' diameters are turned on the lathe. The positioning of the cutting tool used for such internal work differs significantly to the tool used for outside diameters. It is mounted longitudinally in the toolpost (as opposed to transversely) and must extend far enough from the toolpost in order to reach the bottom of the intended bore without touching the chuck. Also, the top rake, front rake and side rake cutting angles of the boring tool vary considerably to the tool used for external diameters. Care should be taken that the cutting tool is not mounted so far out from the toolpost that it allows 'chatter' to propagate in the workpiece, as this will adversely affect the finish of the bore  Most commonly used lathe cutting tools are high speed steel (HSS) and tungsten carbide.

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