It is a fundamental principle of dimensioning that the part and its dimensioning should be separated so that one does not impinge on the other and cause confusion. Such an example of incorrect dimensioning practice is shown in Figure 4.7. This is a plate with two circular holes and two rectangular holes in it. The various incorrect practices are shown by the word 'Wrong'. These are dimension lines being within the outline of the part, dimension lines crossing, broken extension lines, extension lines crossing dimensioning lines, shortened extension lines being used.
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