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There are two kinds of straightness tolerance – (1) Straightness of a derived median line [Y14.5-2009 Fig 5-2 and Y14.5-2018 Para 220.127.116.11] and (2) surface straightness [Y14.5-2009 Para 18.104.22.168 and Y14.5-2018 Para 22.214.171.124]. The type of straightness is determined by the placement of the feature control frame.
When the feature control frame is …