Position Tolerances • Deviations in relative locations of surfaces – Misalignment • Deviation of axes which should normally coincide with the geometrical axis • Can be axial misalignment or angular misalignment – Non-parallelism of axes – Incorrect location of intersecting axes • Angular deviation from the specified angle of intersection and the deviation from the point of intersection – Non-perpendicular surfaces • Amount of angular deviation between two orthogonal surfaces
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Position Tolerances
• Deviations in relative locations of surfaces
– Misalignment• Deviation of axes which should normally coincide with the
geometrical axis• Can be axial misalignment or angular misalignment
– Non-parallelism of axes– Incorrect location of intersecting axes
• Angular deviation from the specified angle of intersection and the deviation from the point of intersection
– Non-perpendicular surfaces• Amount of angular deviation between two orthogonal surfaces
Datum
• Defined as the ideal geometrical reference to which the geometrical tolerance features are related
• Indicated by a filled inverted triangle and a leader line
• Shown by a capital letter enclosed in the triangular frame
Representation of Geometrical Tolerance on a Drawing
• Geometrical tolerance zone is an imaginary area or volume in which the actual component should be enclosed
• Geometrical tolerances are represented by symbol, tolerance and datum enclosed in the rectangular frame
• Symbol M indicates maximum material condition of feature size