Global Quantitative Sensitivity Analysis and Compensation of Geometric Errors of CNC Machine Tool

Table 1

Definition of the geometric errors.

Linear axis	Positioning error	Straightness error	Angular error	Squareness error
		,	, ,	, ,
		,	, ,
		,	, ,

and represent translational errors and angle error, respectively; subscript is the error direction and the position coordinate is defined within the parenthesis. , , and are squareness errors between each pair of axes.