CREDITS: Ethan Shou
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The horizontal plane is associated with the top view of orthographic
A line inclined to the plane of projection is shown shorter than true length
A line perpendicular to its projection plane will be seen as a point
Alphabet of lines: the line weight standards used in the making of a mechanical drawing
Isometric=equal measure of 120 degrees
Isometric drawings create a truer, more natural view of an object, but does not represent all the surfaces of the object
in their true shape on a single plane
Visible or object lines are drawn with 2H pencil
Front view is used to represent the most contours and the widest dimension of an object
Dimension lines have the same thickness as object lines and are placed between the views
Construction lines are the lightest
Multiview orthographic: an object drawn in 2 or more views that are at right angles to each other
Depth is shown in top and side views
Miter line: 45 degrees used to transfer dimensions from the horizontal plane to the profile plane to draw the side view
Width is shown in front and top views
Hidden lines: represent features of an object that cannot be seen in a view
The lead of a compass is sharpened to be a truncated cylinder
When using a compass, it should be held slightly inclined to the paper
The correct way to draw vertical lines in mechanical drawing is with the side of a triangle supported by a parallel ruler
or T-square
The pencil that give the lightest line is 6H (bigger the number, the lighter it is)
An auxiliary view is drawn at 90 degrees to the inclined surface
Height is shown in both front and side view
the border and title block with be used repeatedly in ur part file and stored as a pattern file
information about the current part and the CADKEY environment appear in the Status Window
the command to select the exact midpoint of an entity would be found in POSITION menu
in layout mode, an instance refers to a view in model mode
default value is a value for number, conditions or filenames initially set by the program
the EXIT, BACK-UP and ESCAPE commands appear in the break functions window
Ctrl-R redraws the screen
CADKEY communicates with the use and receives input in the prompt line
The history line lists the sequence of commands which you have used
In world coordinates, the XYZ axes are fixed to the object
When masklev=0, any lvl that is displayed can be altered
When copying entities from 1 lvl to another, the msklev is set to the lvl with the entities to be copied
When you trim, you first select the portion of the entity that you wish to keep
Stretch-out line: a line along which the perimeters of the base of a prismatic object is transferred to in a development
Developmental theory: The representation of a 3D object such that all of its surfaces are visible on a single plane
In order to create the true size of an inclined plane, the surface must be either projected at a perpendicular to the
incline or rotated until it is parallel to the plane of projection
Auxiliary view: contains the true size of the top surface in the development of a truncated object
Altitude of lateral surfaces can be obtained from front and side view
Truncation is an angular cut made with respect to the base of a prism
Dimension and extension lines are used to identify the limits and value of the entity being dimensioned
Triangulation: the method used to transfer the length of a line or to find a point in space
the base edge of a cone develops into a sector of a circle
to calculate the angle which encloses the pattern of a right circular cone, you use: radius of base / slant height x 360
frustum is the part of a cone that remains parallel to its base after being cut
CREDITS: Ethan Shou
true facts
1. the border line is the thickest/darkest line on the drawing paper
2. When a hidden contour is collinear with and directly behind a visible contour, the visible contour is represented when
drawing an orthographic projection
3. the true shape of a surface is seen only when the line of sight of the observer is perpendicular to that surface
4. the CURSOR command is not the most efficient method of select the exact end of an entity
5. trim entity can also be used to extend entity
6. Cadkey views: 1-top, 2-front, 3-back, 4-bottom, 5-right, 6-left, 7-isometric, 8-auxonometric
7. when selecting an entity, the center of the cursor does not have to be directly on that entity
8. When creating/editing on a single level, set Actlev and Masklev to that level
9. the true length of an element line on the surface of a right circular con is equal to the slant height
Graphic match-up
76-C
77-A
78-B
79-D
80-E
29-B
30-C
31-A