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When to Use Perpendicularity
(In accordance with the ASME Y14.5-2009 standard)

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You usually do not need to apply perpendicularity or the other orientation tolerances because you get them for free with any location tolerance. The one exception to this is on datum features. Often the relationship of secondary and tertiary datum features to higher precedent datums is perpendicularity. Once the datum features are controlled, all other features need to be located. When you locate a feature, you have automatically controlled the orientation of that feature.

Use Perpendicularity to:

  1. Position
  2. Profile of a surface
  3. Runout

Back to Tips Tip added Feb 2009