04 Chptr - 35 4 Construction Drawings Key Terms Agreement...

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35 4 Construction Drawings Key Terms Agreement Approximate estimate Architect's scale Axial dimensioning Axonometric projection Boundary plane dimensioning Cabinet projection Conditions Decimal scale Detailed estimate Dimetric projection Direct costs Elevations Engineer's scale First-angle multiview projection Floor plans Foundation plan Indirect costs Isometric projection Longitudinal sections Mechanical engineer's scale Metric scale Multiview drawings Object Oblique projection Orthographic projection Parallel projection Perspective projection Pictorial drawing
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Plan views Plane of projection Projections Projectors Reflected ceiling plan Sections Site plan Station point Stipulated sum agreement Technical drawing Third-angle multiview projection Transverse sections Trimetric projection Unit price agreement U.S. Customary Units Utility profile Wall section Key Concepts Successfully interpreting construction drawings requires an open mind, imagination, and an understanding of the goals of design professionals. A word frequently has several definitions; the correct one requires the reader to evaluate the choices in the context of the sentence. The same is true for graphic expressions—the "words" must be taken in context. Objectives Determine the actual size of an object depicted on construction drawings using engineer's, architect's, and SI (metric) scales. List the various projections common to design and construction drawings and their appropriate applications. List and re-create the symbols most commonly used in construction drawings. Identify the various line types used in construction drawings. Produce scaled drawings of simple construction components. Perform quantity takeoffs for simple construction components in English and SI units. 36 Scale, Scales, and Scaled Drawings The word "scale" has many definitions. Those that pertain to construction graphics
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include: (1 a) a system of ordered marks at fixed intervals used as a reference standard in measurement; (1b) an instrument or device bearing such marks; (2a) the proportion used in determining the relationship of a representation to that which it represents; (2b) a calibrated line, as on a map or architectural plan, to indicate such a proportion. 1 1 American Heritage Dictionary of the English Language, Houghton Mifflin Company, 4th edition, 2000. Scale: The Concept When translating from actual or planned object dimensions to a scaled construction drawing, the units of measure (the dimensions of the real object) are "compressed" into representative units. When a 1/4" = 1'-0" scale is used, the reader is expected to understand that every 1/4" in the drawing represents 1' in reality-1' is compressed into 1/4". A 100'-long building, then, would be 25" long on the drawing-100', in reality, are represented by units of 1/4" each (100' x 1/4" = 25"). A very large object is being crammed into a very small area.
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