Boring on the Mill - 5: Finish Cut
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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.
To make the finish pass, loosen the locking screws and dial in the micrometer adjusting screw to the finish size. Re-tighten the screws to lock the boring bar

Make a single pass. Now take another cut (called a spring pass) without touching the micrometer adjustment screw. The spring pass is explained on the next page.

The diameter of the finished hole is exactly twice the offset of the boring bar. This means that for every .001 of tool adjustment you will get .002 of change in hole diameter. R.S.
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label: boring on the mill, rough cut, finish cut, spring back, cleanup, multiple stage boring, uses of boring bar, feed rate, coolant