Boring on the Mill - 2: The Offset Boring Head and Parts
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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.
The offset boring head is available in a variety of models and sizes however the basic function is the same. It has a dove tail slide that is adjustable with a micrometer screw. This slide moves off center thus moving the boring tool off center.

The micrometer adjustment screw can be quickly rotated to a given diameter and also finely adjusted to a precision of a thousandth of an inch.
On the left is a typical boring bar set for the offset head. All shafts are precision ground to fit the boring head. This set - as in most - uses brazed carbide cutting tips. Note the various lengths and body diameters
This boring bar uses a carbide insert instead of the brazed carbide cutting bit.
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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