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CADD-2 Lesson 6
PTC Labs 8-10 Auxiliary Views, Pictorial Drawings, and Sectional Views
Question | Answer |
---|---|
Auxiliary View | an additional view, usually of a slanted or inclined surface, showing that surface in it's true shape. |
Isometric drawing | A kind of pictorial drawing based on height, width, and depth. Horizontals are usually drawn at 30 degrees from the normal horizontal axis; verticals remain parallel to the normal vertical axis. The least realistic of all Pictorial Drawings |
3 types of Axonometric Drawings | Isometric, Trimetric, Dimetric |
Cavalier Oblique | Depth is full length |
Normal Oblique | Depth is 3/4 size |
Cabinet Oblique | Depth is 1/2 size |
Perspective drawing | the most realistic of all Pictorial drawings |
Full Sectional View | developed when a cutting plane passes completely through an object. The cutting plane may be vertical or horizontal. |
Half Section View | developed by passing two cutting planes perpendicular to each other through an object and a quarter of the object is removed. |
Pictorial Drawing | Shows the likeness of an object as viewed by the human eye. |
Isometric Axes | The horizontal and vertical axes used in an isometric drawing and intersect at 120 degree angles. |
Non-Isometric lines | Lines that form the edge of an inclined surface in an Isometric drawing. |
Axonometric Projection | Drawing style that alters the X-axis to make a drawing appear in 3-dimensions. (Isometric, Dimetric, Trimetric) |
Regular Isometric | Viewpoint is looking down on the top of the object. |
Reverse Axis Isometric | View point is looking up on the bottom of the object. |
Long Axis Isometric | View point is looking from the right (or left) of the object. |
True-length distances | Only shown along an Isometric Line |
Cutting Plane | Identifies where the part is to be cut to expose the inside. |
Cross Sectional Lines | Identify the type of material the part is made from. |
HATCH | Command used to create cross sectional lines in AutoCAD. |
HATCHEDIT | Command used to modify an associative hatch pattern. |
Revolved Section | Primarily used for ribs, spokes, and structural shapes where the sectional view is created by rotating the cutting plane around an axis. |
Removed Section | Similar to a revolved section however the sectional view is placed in another location on the drawing for clarity. |
Broken-Out Section | Method used when only a small portion of the object shown in section will provide the required information. |
Offset Section | Uses a stepped cutting plane in the primary view so that it passes thru the required features to be shown in the sectional view. |