Here is a drawing with some very typical Plus/Minus Tolerances: The notion here is that the drawing is perfect, the dimensions are perfect, and it is the role of plus/minus tolerancing to tell the builder or inspector how much the dimensions can differ from perfect. Plus/Minus Tolerancing, also called Limit Tolerancing, is a two dimensional tolerancing system that is probably the most familiar way of expressing tolerances there is. CNCCookbook Beginner’s Guide to GD&T: Plus/Minus Tolerancing
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