If the zone width increases, the degree to which an erroneous angle is accepted also increases. In other words, the zone is oriented to the datum at a basic (or theoretically exact) angle and the surface variation is allowed to float between the two planes. In the case of surfaces, the tolerance zone is expressed by two parallel planes that are aligned with the exact angle required by design. The shape of the tolerance zone changes with the feature being controlled. But this is not the case with angularity. This would mean that the feature is supposed to be at a 30 degrees angle in relation to a datum and is allowed an angular variation of 10 minutes on either side. The biggest misconception regarding angularity is that it creates an angular tolerance zone such as 30 degrees +/- 10′. The angularity callout creates a tolerance zone around the mid-plane to control these features. In those cases, angularity controls the center axis of the hole to fix its orientation.Īngularity is also used to control the orientation of non-circular features such as tabs and slots. This is especially important for parts with angled surfaces that mate with other parts in an assembly.Īt times, angularity finds use in aligning a feature of size, such as pins or holes in a surface, to the desired angle. It can be used to reference a line with respect to another line but more commonly it is used to maintain a surface at an angle to a datum or reference plane. V How to Measure Angularity What Is Angularity?Īngularity is a 3-D GD&T callout that helps maintain a specified angle between a feature (line or surface) and a reference feature.
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