1) Dimension lines should be drawn at least 8 mm away from the outlines and from each other.
2) Dimensions in a series may be placed in any one of the following two ways:
a) Continuous or Chain dimensioning:Dimensions are arranged in straight line. An overall dimension is placed outside the small dimension. Least important dimensions is generally omitted.
b) Progressive or parallel dimensioning:
All dimensions are calculated from a common base line. Cumulative error is avoided by this method. This method is preferable compared to other.
3) Smaller dimensions should be placed nearer the view and the larger further away that so that further away so that extension lines do not cross dimension lines. Extension lines may cross each other or the outlines.
4) When a number of parallel dimension lines are to be shown near each other, the dimensions should be stagged.
5) Dimension should be placed where the shape is easily identified.
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