The true position of an object is its location, which is determined by the basic dimensions. The true position helps to control the variation of a specific feature from its desired position.
For example, the screw holes on a cylinder head cover must match the screw holes on the engine casing in size as well as position. In case they don’t, the two parts will not mate, and the lubrication oil for the valve assembly will leak out, defeating the purpose of the cover. The cylinder cover is useless, and a different piece must be used.
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