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We have a number of parts that have a short bore (1-1.5") bored thru a large face (10-15"diameter). The perpendicularity callout is typically about .002.
Here's the problem; parts have checked OK for years, but they are always written up as non-conforming because the CMM area insists on checking it both ways; 1) short bore as the major alignment and then 2) large plane as the major alignment. Reported results are typically .0040 and .0005 respectively, so they always fail one way or the other.
So the question is; Does ANSI Y14.5 perpendicularity really call out a precedence depending on where the symbol (on bore or face) is placed, or can we use common sense here and discard the highly variable reading?
Seems we're spinning wheels and spending time for nothing. Thanks in advance.
Here's the problem; parts have checked OK for years, but they are always written up as non-conforming because the CMM area insists on checking it both ways; 1) short bore as the major alignment and then 2) large plane as the major alignment. Reported results are typically .0040 and .0005 respectively, so they always fail one way or the other.
So the question is; Does ANSI Y14.5 perpendicularity really call out a precedence depending on where the symbol (on bore or face) is placed, or can we use common sense here and discard the highly variable reading?
Seems we're spinning wheels and spending time for nothing. Thanks in advance.
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