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Perpendicularity

Perpendicularity is the condition of a feature which is at right angles or 90 degree to a datum plane, it can be thought of as 90 degree angularity, though no angular is shown.



When the perpendicularity of a surface is controlled relative to a datum plane, the tolerance zone is confined by two parallel planes that are right angle to the datum plane.

perpendicularity

Perpendicularity of a center plane to a datum plane
When the
perpendicularity of a center plane is controlled relative to a datum plane, the tolerance zone is confined by two parallel planes at right angles to the datum plane. The perpendicularity tolerance must be less than the tolerance of location for the slot but it may be greater than feature's size tolerance.

perpendicularity  symbol

Perpendicularity of a center plane to a datum plane with MMC


perpendicularity gd&t

Feature size
Perpendicularity tolerance zone "X"
16.01
0.05
16.00
0.04
15.99
0.03

 

Click on the following links to get more information on GD&T concept.

 

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