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Extension line — a thin, solid line perpendicular to a dimension line, indicating which feature is associated with the dimension. Visible gap — there should be a visible gap of 1 mm between the feature's corners and the end of the extension line.
Extension lines on a drawing are fine, dark, solid lines that extend outward from a point on a drawing to which a dimension refers. Usually, the dimension line meets the extension line at right angles. There should be a gap of about 1 / 16″ where the extension line would meet the outline of the object, and the extension line should go beyond ...
If there is space available, the arrows should be placed within the dimension. The numerical value representing the measurement is placed in line with the dimension line. See: Rules for Dimension Lines. Extension Lines. Extension lines are used to indicate the boundaries of a feature to which a dimension is applied.
7. A dimension line should never coincide with an object line or a center line, nor should it be an extension of these lines. Both, however, may be used as extension lines. 8. Crossing of extension lines or dimension lines should be avoided if possible. Where such crossings are unavoidable, there should be no break in either of the lines.
Aug 1, 2024 · [Image of Extension Lines in Engineering Drawing] Avoid Crossing Dimension Lines: Dimension lines should never cross each other, as this can create confusion and make the drawing difficult to read. If dimension lines must cross, break one of the lines to avoid ambiguity. [Image of Crossing Dimension Lines in Engineering Drawing (wrong) and ...
The dimension line is a thin line, broken in the middle to allow the placement of the dimension value, with arrowheads at each end (see diagram below). An arrowhead is approximately 3 mm long and 1mm wide. That is, the length is roughly three times the width. An extension line extends a line on the object to the dimension line.
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Extension lines should extend 1/8 inch (3mm) beyond the last dimension line. Extension lines should be broken if they cross or are close to arrowheads. Leader lines used to dimension circles or arcs should be radial. Dimensions should be oriented to be read from the bottom of the drawing. Diameters are dimensioned with a numerical value
