Sep 14, 2016· The illustration below shows how the actual envelope of the hole can move, as allowed by the specified positional tolerance of the hole. The advantage of using a GDT positional tolerance as opposed to an ordinary size tolerance of the holesuch as a simple plus/minus " diameter is that the use of the positional GDT symbol also controls the geometric form of the hole.
How GDT Form Tolerances Affect Shaft Fits MISUMI USA
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