ENGR 1182 Midterm I
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Isometric Sketches
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• Isometric sketches represent 3D objects in 2D space. • They are made as if you are looking down the diagonal of a cube.
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Coded Plans
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• Coded plans define simple objects which can be made from blocks. • Each number represents how tall the stack of blocks is at that location.
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Circles appear as _____ in isometric sketches
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ellipses
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Through hole vs blind hole
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Goes all the way through vs goes partially through an object
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When creating an isometric sketch, make sure you show ____ of the surface in question.
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only the visible part
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With the isometric method, the axes are projected onto the paper as if you were looking down ____.
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the diagonal of a cube.
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When creating corner views of simple objects, lines are included ____ of surfaces.
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at corners
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When sketching arcs and circles, use lightly sketched square _________________________to define the limits of the curved entities.
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bounding boxes
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Orthographic Projections
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• Hidden lines show features that are not visible from that view • Multiple views of an object determine where to include hidden lines in orthographic drawings
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In ____ projection, the image of an object is composed of points projected from individual points on the object onto the viewing plane such that the projection of each point is perpendicular to the viewing plane.
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orthogonal
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Objects such as engineered parts can usually be fully defined when they are viewed through a set of viewing planes that together form a(n) ____.
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glass box
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Although there are no defined rules as to which views must be included or excluded in a formal engineering drawing, there is a preferred configuration—the front, top, and ____ views.
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right-side
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How many standard or principal views are there?
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six
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_________________________, which are denoted as equally spaced dashed lines on a drawing, represent the edges of an object or its features that cannot be seen on the real object but would be visible if the object were partially transparent.
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Hidden lines
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Two types of dimensioning? And which one is preferred
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Chain and baseline (preferred)
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____, represented by alternating short and long dashes, cannot be seen on the real object, but they must be included on the drawing to identify where the center of the circular hole is located on the object.
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centerlines
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If an arc is equal to or greater than ____ degrees, center lines and center marks should be used.
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180
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Dimensions should be located inside the boundaries of the object and placed between views whenever possible. (T/F)
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False
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Formal Drawing
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Detailed multi-view representations of a finished part Includes: - Detailed orthographic views - Isometric view of part - Dimensions - Tite block
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Working Drawing Packets Includes
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Assembly Drawings Assembly of parts (parts already fit together) Exploded assembly (show how parts fit together) •Detail drawings of non-standard parts •Bill of Materials
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Title Block Components
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Part name, Scale, Units, Author, Date, any other necessary info
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Assembly Drawings
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Fully assembled object is shown with all required pieces - Multi-view drawing
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Section View Drawings (Definition and Components)
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Views of parts with cutouts to show inner details Components: 1. Cutting plane line 2. Viewing Direction 3. Cutout View (Section A-A)
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Full Section Views
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Object is cut completely in half by a cutting plane perpendicular to the viewing plane This will show the full interior of the part
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Half Section Views
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Half of the interior is visible by cutting out a part of the object The section view shows both the exterior and interior
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One of the main incentives for using section views is to reduce the use of ____.
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hidden lines
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The simplest section view is the ____.
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full section
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One way of visualizing a half section is to imagine a part that is cut such that ____ of it is removed to reveal the interior detail.
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one-quarter
