Dimensioning Guidelines Terminology Dimensioning Dimension Amount The process

Terminology Dimensioning Dimension Amount The process of describing the size of an object, and

Terminology Dimension Line A dimension line is a thin line drawn perpendicular to extension

Dimension Line Geometry The first dimension lines should be placed 3/8” from the object,

Unidirectional Dimensions All dimension values should be oriented parallel to the bottom edge of

Unidirectional Dimensions The example below is incorrect because the numbers are oriented towards the

Terminology Extension Line An extension line is a thin solid line that is drawn

Extension Line Geometry Extension lines start about 1/16” from the object, and extend about

Object Lines as Extension Lines Object lines should never be used as an extension

Dimension Placement If properly placed, dimensions will appear to taper from largest to smallest.

Contour (Shape) Dimensioning Dimensions should be placed on the view that best illustrates the

Centering Dimension Values In most cases, dimension values should be centered on their dimension

Dimensioning Between Views Whenever possible, dimensions should be placed in the space between the

Dimensioning Within an Object Do NOT place dimensions within the object. Always locate dimensions

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Dimensioning Guidelines

Terminology Dimensioning Dimension Amount The process of describing the size of an object, and locating important features of the object. Extension Line Dimension Line

Terminology Dimension Line A dimension line is a thin line drawn perpendicular to extension lines with arrowheads at each end. • indicates linear distance between object edges and locates features such as holes. Green Lines

Dimension Line Geometry The first dimension lines should be placed 3/8” from the object, with each successive dimension line spaced ¼” apart.

Unidirectional Dimensions All dimension values should be oriented parallel to the bottom edge of the paper, and should read left-to-right (unidirectional). Correct

Unidirectional Dimensions The example below is incorrect because the numbers are oriented towards the right side of the page. Incorrect

Terminology Extension Line An extension line is a thin solid line that is drawn perpendicular to a dimension line. • extends an object line or centerline • shows the extents of a dimension Green Lines

Extension Line Geometry Extension lines start about 1/16” from the object, and extend about 1/8” past the last dimension. 1 8 Object 1 16

Object Lines as Extension Lines Object lines should never be used as an extension line. Dimensions lines must terminate on extension lines. Incorrect

Dimension Placement If properly placed, dimensions will appear to taper from largest to smallest. The largest dimensions should occur furthest away from the object.

Contour (Shape) Dimensioning Dimensions should be placed on the view that best illustrates the shape or contour of the feature. Incorrect

Contour (Shape) Dimensioning Dimensions should be placed on the view that best illustrates the shape or contour of the feature. Correct

Centering Dimension Values In most cases, dimension values should be centered on their dimension lines or between their extension lines. Incorrect

Dimensioning Between Views Whenever possible, dimensions should be placed in the space between the front, right side, and top views. Incorrect

Dimensioning Within an Object Do NOT place dimensions within the object. Always locate dimensions outside of the object. Incorrect