auxiliary dimensions When all the dimensions which add up to give an overall length are provided the overall dimension may be added as an auxiliary dimension. This is indicated by enclosing the dimension in brackets. Auxiliary dimensions are never toleranced and are in no way binding as far as machining operations are concerned. Figure 1.11 illustrates the use of an auxiliary dimension, namely(100) If the overall length dimension is important, then one of the intermediate dimensions is redundant, for example the width of the narrow groove in the centre This dimension may be inserted as an auxiliary