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Parallelism Issue

Hi All,

Having a bit of trouble reporting parallelism. Using the PARALL command I am getting a value of 0.0208 but when looking at the APTs of both planes, they follow the same shape and deviations are within parts of microns of each other. I am expecting to see a value of less than a micron for the parallelism. Both planes have a form of around 20 mircons.

Unless I am being really stupid, what I am I doing wrong? I have been playing around with the values in the 'projected tolerance zone' box and when I change those the parallelism value changes. I do not really understand what this box does or what to put in it my go to was to leave it blank.

Any help would be great thanks