Boring on the Lathe - 5:Boring off the Cross Slide
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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.
Sometimes it is better to mount the part to be machined on the cross slide and mount a boring bar between the head and the tailstock. This allows for long boring depths and is often used to bore out an engine cylinder. The part to be machined must me shimmed to reach the centerline of the lathe, aligned along the centerline of the lathe, and then clamped solid. The examples below are courtesy of Kap Pullen
Note the fixturing that keeps the casting in position. Also notice how large in diameter the boring bar is. This to reduce flexure as much as possible
A micrometer fixture is used to adjust the cutting tool offset thus adjusting the cut diameter.
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label: lahte boring, broing bars, setup, controll, cross slide boring