Verification of manufactured parts with GD&T drawing

How to verify whether the manufactured and inspected parts are within design specification for GD&T drawing - position of hole

For a manufactured part with these dimensions measured in inspection.


Case 1 : 

Size measured is 15.05

Deviation of axis of hole from axis of datum B is 0.1
Location of hole from datum A is 50.2

Whether the part is within spec or out of specification?

Tolerance zone definition :

Tolerance zone is the yellow circle

Size of tolerance zone = Geometric tolerance + bonus tolerance

Bonus tolerance = deviation from MMC = 15.05-14.9=0.15

Total tolerance zone size = 0.15+0.2 = 0.35 mm

The horizontal deviation from axis is 0.1 and vertical deviation from Basic 50 is 0.2 (50.2 -50 ) so we can construct a point diagram in tolerance zone and find the radial distance of new point from the fixed tolerance zone and find out whether the point lies within the yellow circle

Reference diagram of tolerance zone and location of as measured hole centre  :

Actual location of point to scale :

Point lies outside the tolerance zone hence part is rejected  as per design intent !

Learn more about how to Interpret GD&T callouts from this Free e-book on GD&T interpretations

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Categories: : GD & Tolerancing