MPEE

MPEE = Maximum Permissible Error for length measurement

To determine length measuring error, calibrated gage blocks or step gage blocks are measured. With every measurement, 5 different lengths in 7 different positions within the measuring range of the CMM will be determined according to ISO 10360-2.

Every length will be measured 3 times. None of the 105 measurements are allowed to deviate from the calibrated value by more then the specified amount. The specification is in most cases dependent on the length, written in the form MPEE=A+L/K, whereby L represents the length. Sometimes the formula will be written as MPEE=A+F•L/K, in which case the formula must be converted in order to compare to it to the first variation.

For example, the values MPEE=2.5+1.5•L/333 and MPEE=2.5+L/220 are the same.

Volumetric Length Measuring Error E describes the CMM error when measuring Distances, Diameters and Position Tolerance.

 

 

 

MPEE Application