I'd like to ask all you experienced metrologists about this one thing that the stubborn operators at my place of work claim to know everything about, because it's the way they've always done, long before geometrical product specifications (which is a blur to them) were invented and long before CMM's were invented...
Say you have a part, the bottom is ref A, 3 point locations specified on the drawing (my primary alignment).
All dimensions in Z-axis originates from this plane. The dimensions in Z-axis consists of, say, 26 spotfaces all dimensioned, say, 10.3 +/- 0.1 mm.
Would you measure these 26 spotfaces point-to-point with the exact same X and Y coordinates on the bottom and on the spotfaces to get the best measured values (as you would measure with a caliper)?
Or would you use reference A, by just evaluating the Z-axis location on these 26 individual spotfaces?
Or would you measure this in a totally different way?
Say you have a part, the bottom is ref A, 3 point locations specified on the drawing (my primary alignment).
All dimensions in Z-axis originates from this plane. The dimensions in Z-axis consists of, say, 26 spotfaces all dimensioned, say, 10.3 +/- 0.1 mm.
Would you measure these 26 spotfaces point-to-point with the exact same X and Y coordinates on the bottom and on the spotfaces to get the best measured values (as you would measure with a caliper)?
Or would you use reference A, by just evaluating the Z-axis location on these 26 individual spotfaces?
Or would you measure this in a totally different way?

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