Boring on the Mill - 3: Boring Tool Setup
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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.
When choosing a boring bar, you must first be concerned with rigidity. Choosing a sturdy boring bar that is less flexible will stiffen the setup and reduce spring back. Also, never use a length any longer than needed. The longer the neck the more flex.

You must always be concerned with the relief angle on the tip of the tool. For through holes any lead will work. But for holes with a shoulder at the bottom only the Zero lead can be used.

Finally you must ensure that the rake of the tool is neutral. By rotating the cutter within the boring bar you can present the cutter in negative rake (above center) neutral rake (on center) and positive rake (below center) Failure to set a neutral rake will result in premature wear of the cutting surface of the tool and excessive vibrations.

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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