0012// Tangent Planes
In some cicumstances, functional requirement of the part/components only require geometrical characteristic of feature's tangent planes under control. So, today we will discuss what is tangent plane in GD&T and how its work.
Tangent plane establihed by contacting point of a surface.
To indicate only tangent plane contolled, the tangent plane symbol added in the feature control frame after the stated tolerance.
Besides that, if tangent plane symbol is specified, flatness and imply flaness is not controlled by the geometry tolerance.
Below shown an example for tangent plane symbol application,
However, in some circumstances the huge form variation cause the surface have more than one possible tangent planes. This phenomenon also know as rocking. In order to choose the correct tangent planes, method of verification can found in Y14.5.1M, Methematical Definition of Dimensioning and Tolerancing.
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