where:
• YSlope will be misalignment value;
• X is the distance traveled along the measurement path;
• b is the first straightness reading.
Knowing the misalignment (1), the YSlope can be calculated for each X along the measurement path. All the YSlope have to be subtracted from the values of the actually measuring (YMeasured), leaving the true straightness error ( YTrue ), Eq. (2).