Boring on the Lathe - 4: Controlling the Boring Operation
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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.
This video shows how to control the diameter of the bored hole by using the cross slide. Note the operator dialing in before removing the tool from the hole as to leave no witness marks.
The animation on the left shows how you can bore and face in one pass.

Why would you want to do that?

To keep witness marks off of the corner of the part. When facing and boring or facing and turning are done separately there is often a witness where one operation ended and another operation began. By making your final pass a boring and facing operation there is no tool mark in the corner to show a dwell or pickup.

As with milling it is important to understand that there is flexure in the tool and a spring pass is probably required.
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label: lahte boring, broing bars, setup, controll, cross slide boring