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So we got some parts today that were 144" +-.002. They were 6063 U shaped extrusion .750 x .750 . Obviously somebody was smoking crack when they drew that up. Stuck a pin in the middle and measured both ways. I think I'm within .005 . I'd like to see them try and measure it..........
I'd like to see the verification that the calipers are that accurate and repeatable from one operator to another. I'm also pretty damn skeptical that humans are capable of not inducing whatever error to suit their needs into calipers readings either. Accuracy of that level on pieces that large? Measured with calipers? Repeatable? OK..................
Pretty much, On really high tolerance parts we either have the QC inspector and 2 other people measure it or put it in the CMM. Since this is too big for the CMM it got the measuring party. We were all within .005 of each other. I tend to always be on the small side, I push on the calipers too hard.