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Nominal value

Hi,

End of measurements i notice something in the report that actual values have gone back to nominal values.
This has happened on three different things.

1) Constructed circle from a measured cone( here i use height, value, origin, workplane)
2) Angel by using feature location (half angel)
3) Regular measured circles by using true position

This happens randomly and.

when i try to calculate the measurements all over again i may receive the same value or suddenly a different one, the is only regards constructed circle.

Does anybody here have experienced the same thing? or do i do something completely wrong here?