We are currently having a discussion about leveling to a primary plane, (Datum A). The discussion concern is whether we should be leveling to a "high point plane" or if we should be leveling to a "best-fit" plane using every point that is probed.
I am currently probing a planar surface that is approximately 150mm diametrically in 3 seperate rings that are 5 degrees apart so there are a total of 216 points. I have an overall flatness of approximately 0.3mm with a total tolerance of 0.8mm.
As I stated before the disussion is whether we should be finding the high points of the plane and then be leveling to that plane or not (high point plane). I guess my feeling is that you would not level to the high point plane but in certain applications you may want to set the "Z" origin to that plane.
What are your most common approaches of leveling to the primary Datum plane? Thanks for your replies!