Though many people refer to the GD&T Position symbol as "True Position," they are not the same thing. Read on to learn the difference between Position and True Position and how they work together to define the position of a feature.
While the position tolerance on its own controls how far from true position the feature can be regardless of the size of the feature, position in conjunction with MMC sets a minimum size and positional location of the hole to maintain functional control. It allows the position of the part to...
Offset (Y)- This is the difference between the basic dimension (Drawing) and the actual measurement of the produced part. Calculated (ACTUAL) True Position- The calculated positional tolerance diameter zone. Allowable True Position- This is the true position tolerance defined/required (drawing) . ...