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Term Definition

Calculated by adding the normal and inverted readings and dividing the result by 2. TCE is a measure of how far from a bore center the target's center actually is. Can be used to adjust raw readings to find true bore centering error (BCE).


This is used when measuring the parallelism or levelness of rolls. With the target facing the laser, the roll is rotated slightly back and forth until the highest point is determined, which is the top dead center of the roll. This should be used when tight tolerances are needed or when it is difficult to determine if the target is near top dead center, usually when measuring vertical rolls.

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