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CADD-2 Lesson 6

PTC Labs 8-10 Auxiliary Views, Pictorial Drawings, and Sectional Views

QuestionAnswer
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.
Created by: tmurphy