hello - I was told today that I did not understand the use of perpendicularity - I have a piece that has 2 90 degree surfaces - the top surface is 10" long which is perpendicular to the front surface which is 36" long = the front surface is datum a the top surface is perpendicular to a within .001" - I was told that in this configuration that surface a could be out by at least .036" (.001"x36) - this does not seem right to me - I thought that surface b must lie between 2 planes within .001" perpendicular to surface a - I would think that if a straightness tolerance of say .001"per inch on datum a then that might apply - I just need to clarify it for myself - any help would be greatly appreciated - thank you
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