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Leap frog Issue

I am having an issue with a program when I relocate the portable CMM by leapfrogging, The first part that the program was created with worked out great, however when I run the next part(s) all the dimensions are off location by a gross amount( 3 to 7 mm) after the relocating of the CMM, I have used the leapfrog process several times on single parts with good results, this is the first time I needed to use it with multiple parts that the program is repeated, as always any help is greatly appreciated.