The set of these points is called a line. The most fundamental parameter to define any engineering design is a point. Crossing of extension lines or dimension lines … The extension 1. 23. A gap of about 1.5 mm should be left where the extension line would join the object outline. They extend by about 3 mm beyond the dimension lines. This gives rise to number of important line types. As far as practical, avoid drawing extension lines directly to the outline of an object. Figure 23 - Dimensioned Drawing. That is, the length is roughly three times the width. I see when there are no arrows selected in the dimension style the dimension line goes right to the extension line, but I need arrows as well. 8. Graphics language Describe a shape (mainly). Basic Line Types & Name according to application Continuous Dash Chain Style Thickness Thick Thin 1. 24. Just as the points can be arranged in a number of fashions. An arrowhead is approximately 3 mm long and 1 mm wide. Leader line Center line Hidden line Visible line represent features that can be seen in the current view. A dimension line should never coincide with an object line or a center line, nor should it be an extension of these lines. These will be discussed shortly. 26. Figure 3-31.-Breaking extension lines and leaders at points of intersection. the extension lines. represent features that cannot be seen in the current view. The dimension line is a thin line, broken in the middle to allow the placement of the dimension value, with arrowheads at each end (figure 23). • If possible, dimension lines are aligned and grouped for uniform appearance. The dimension line meets the extension lines at right angles, except in special cases. Dimension Line extend to extension line? A table located in the bottom right-hand corner of an engineering drawing that identifies, in an organized way, all of the necessary information that is not given on the drawing itself. The thickness of the lines must be chosen according to the type and size of the drawing from any of the six groups given in Table 1. Both, however, may be used as extension lines. When extension lines cross other extension lines or visible object lines, no break in either line should be made. Title Block. An extension line is a thin, dark, solid line that extends from a point on the drawing to which a dimension refers. The article talks about Line Types and Dimensions in Engineering drawing. Hidden or dotted line- Interior or hidden edges and surfaces are shown by hidden lines. A thin solid line perpendicular to a dimension line, indicating which feature is associated with the dimension. Extension line 3. The other end, without an arrow, terminates at the point used as the center in drawing the arc. 7. A center line may be extended and used as an extension line, in which case it is still drawn like a center line. Dimension line 2. 10 Different Types of Lines Used In Engineering Drawing boxed in a spot toward the lower portion of the drawing sheet. Center lines should generally not extend from view to view. When it is necessary for extension lines to cross each other, they should be broken (exceptions to this rule have been adopted since the development of CAD software). Elements of Engineering Drawing Engineering drawing are made up of graphics language and word language. radius of an arc is to be indicated, there is an arrow at only the end of the line that touches the arc. Extension Lines - solid thin lines showing point or line to which dimension applies. In unusual cases, extension lines may be drawn at other angles if their meaning is clear. Hidden - Thin Visible Object - Thick Engineering Drawing www.AgriMoon.Com 19 The arrowhead on a dimension or leader line is an important detail of a drawing. Engineering Drawing Project Engineering Drawing (FCE – 142) 2. 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