What Does the Dash Line Means in Plan Drawing
Line Types
Lines are drawn to describe objects, hidden conditions, and of import relationships between components and space. A line drawn on a surface has both direction and weight. The weight of a line refers to its thickness and intensity; a line can also exist continuous or dashed. The direction can be straight, curved, diagonal, or a combination of these. In drafting, continuous lines of various weights are used to represent objects and major elements such as structural walls and columns. Dotted lines are ordinarily used to denote objects hidden from view. Nonetheless, they can also be used to denote other things, such as a wheelchair turning radius or ceiling height changes on a floor programme. The following are the almost commonly used line types. Examples are shown in Figure 3-7.
• Cutting lines: show major slices in a building or object.
• Object lines: bear witness major outlines of building elements or objects.
• Hidden lines: betoken areas or objects not visible on the surface, or objects subconscious behind others. They are also used to show objects to a higher place the cutting aeroplane of a floor program, such equally wall cabinets, beams, arches, etc.
• Centerlines: locate the symmetrical middle of objects such as windows, doors, beams, and walls.
• Dimension lines and extension lines: indicate the physical dimensions of objects. Dimensions are placed directly above the dimension line or inserted inside it.
• Leaders: line extending from text and ending with an arrow, pointing to an object or place.
• Break lines: indicate where an object or surface area is not drawn in its entirety.
• Layout lines: are used in the preliminary blocking out of components and for lettering guidelines.
Line Weights and Their Uses
Line weight refers to the blackness (intensity) and width of a line on the drawing surface. In general, heavy (dark) lines are used to correspond cutting planes and contours (or outer boundaries) of an object. In a floor-plan view, information technology is ofttimes the walls that are drawn with the darkest lines in gild to define the spaces (Figure 3-viii). These lines appear to exist the closest to the viewer and are perceived equally major elements. Medium and lighter lines appear to be further away from the viewer and are used for secondary emphasis.
border line cutttngt aeroplane line
object line
o z dimension i extension line
--"inbreak line
Figure 3-7 These are common line types used in drawings to describe objects, hidden conditions, and important relationships between components and infinite.
Drawings for interior blueprint projects generally use 3 line widths: thick (dark), medium, and thin (light). Thick lines are mostly twice as wide every bit thin lines, usually V32 inch or nigh 0.viii mm wide. Sparse lines are approximately V« inch or 0.four mm broad. Medium lines fall betwixt these ii extremes. In pencil drawings, each type can be further broken down, depending on the variety of atomic number 82 and level of pressure. With the variety of mechanical pencils on the market place today, it is easy to control line widths. As discussed in Chapter 2, fine-line mechanical pencils are available in a 0.3, 0.five, 0.vii, or 0.9 mm pb. By switching to different pencils, the drafter can vary line weight easily.
Figure iii-8 In a floor programme, the walls are often drawn darkest to ascertain the spaces. The viewer tends to come across these lines first, and thus they are perceived as major elements.
Figure 3-9 Dark, thick lines are commonly used in building sections to denote where a plane is cut.
Figure 3-ix Dark, thick lines are commonly used in building sections to denote where a plane is cut.
Edifice Section
Thick, Night Lines
Thick, dark lines are used for major sections (Figure 3-nine), details, borderlines, and cutting plane lines. A thick, intense line tin can represent the walls on a flooring programme or structural members, such equally fireplaces or stairways, the outline of a ceiling on a reflected ceiling programme, or the outline of a building on a site plan. Thick, intense lines are besides used to emphasize an object or element.
Medium Lines
Medium-weight lines are used for subconscious objects and are normally drawn dashed or dotted. They are also used for outlining the planes of objects and for centerlines, also as for furniture and equipment. Sparse, Light Lines
Thin, light lines are generally used as guidelines, drawn to aid line up sure details or to help with lettering height. These lines should be barely visible and should disappear when a print or copy is made. Lines that are a lilliputian darker are used for dimension and extension lines, leaders, door swings, and break lines.
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