In this article, Millired will introduce the meaning of deviation and tolerance in machining.
    Dimensional deviation=A size (actual size, limit size, etc.)-Nominal size
    Actual deviation=Actual size-Nominal size
    Limit deviation=Limit size-Nominal size
    Upper limit deviation(ES/es)=Upper limit size(Dmax/dmax)-Nominal size(D)
    Lower limit deviation(El/ei)=Lower limit size(Dmin/dmin)-Nominal size(D)
    Tolerance is the amount of allowable dimensional variation, and tolerance and deviation are two different concepts. The size of the tolerance determines the size of the range of allowable size changes, the nominal size is the same, the greater the tolerance value, the lower the accuracy of the workpiece, on the contrary, the higher the accuracy of the workpiece.

    Dimensional tolerance(T)=Upper limit deviation(Dmax/dmax)-Lower limit deviation(Dmin/dmin)

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