A small section of the tip of the dead centre is retained to ensure concentricity.
From the en.wikipedia.org
The preservation of concentricity between the turning and grinding operations is crucial for quality work.
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Relations are used to define attributes such as tangency, parallelism, perpendicularity, and concentricity.
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The reduction of material can weaken the tube and may introduce thread concentricity problems to the system.
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Ability to make precise adjustments for alignment, parallelism, and concentricity due to the continuing effects of malfunctions throughout the entire machine or equipment.
From the jobview.monster.com
The advantage of using a combination reamer is to reduce the number of turret operations, while more precisely holding depths, internal diameters and concentricity.
From the en.wikipedia.org
There are hybrid self-centering chucks that have adjustment screws that can be used to further improve the concentricity after the workpiece has been gripped by the scroll jaws.
From the en.wikipedia.org
More examples
The quality of having the same center (as circles inside one another)
Concentric objects share the same center, axis or origin with one inside the other. Circles, tubes, cylindrical shafts, disks, and spheres may be concentric to one another. Concentric objects generally have different radii, as concentric objects with the same radius are equal.
The condition of being concentric
The measurement of how well-centered the core is within the cladding.
Adherence of part features to a common center.
Dimensional relationship of 2 or more items sharing a common center line.
In a wire or cable, the measurement of the location of the center of the conductor with respect to the geometric center of the circular insulation.
The uniformity of hose wall thickness as measured in a plane normal to the axis of the hose.
A situation where a smaller circle is exactly in the center of a larger circle when measured in every direction. Valves will operate efficiently and give long service life only if the valve guide is concentric with the valve seat.