GD&T Symbols
Machine Shop Math; About; GD&T Symbols – A Beginner's Guide. June 16, ... A basic dimension is a theoretically exact dimension used to calculate GD&T tolerances. Shown enclosed in a box. Older blueprints may identify the feature with BSC instead. ... It reads "Type of control" of "Tolerance" to Datum. It should be noted that if a ...
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