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Intro to CAD Lesson2
Units 5 & 6 (Basic Shapes , Object Selection, & Symmetry)
| Command/Option | Definition |
|---|---|
| Select Options | Methods for selecting entities on the screen in AutoCAD |
| Entity | The smallest predefined element in a drawing |
| Selection Set | Allows you to group objects (entities) together for modification. |
| Window option | Selects entities completely inside the box. |
| Crossing option. | Selects entities inside the box as well as any it touches. |
| Remove option | Changes from Select Objects to Remove Objects |
| Add option | Changes Remove Objects back to Select Objects |
| Last option | Selects the last entity you created. |
| Previous option | Selects the previous selection set. |
| Fence option | Draws a series of lines that selects any objects the line touches. |
| GRIPS | Handles that allow you to select objects before applying the command. |
| CPOLY option | Similar to a crossing box, but allows you to create an irregular shape polygon that selects all entities inside as well as any it touches. |
| WPOLY option | Similar to Window, but allows you to create an irregular poly window around objects to be selected and selects only those completely inside. |
| All option | Selects all entities within the drawing. |
| OOPS command | Restores the previously erased object. |
| UNDO command | Reverse the previous command(s). |
| REDO command | reverses the previous Undo command. |
| Types of entities in AutoCAD | Lines, Arcs, Circles, Dimensions, Text, Blocks, Points, Shapes, & Solids. |
| Verb/Noun Selection Technique | Traditional method of selecting objects. Select a command, then select objects. |
| Noun/Verb Selection Technique | Utilizes Grips to reverse this process. Selects entities first, then applies the command. |
| 5 Commands Available using GRIPS | Mirror, Stretch, Rotate, Move, and Scale |
| 3 types of Symmetry | Reflection, Rotation, Translation |
| Regular Polygon | All sides are equal, internal angles are equal. |
| Pentagon | 5 sided regular polygon. |
| Hexagon | 6 sided regular polygon. |
| Octagon | 8 sided regular poygon. |
| Inscribed | Inside the imaginary circle. |
| Circumscribed | Outside the imaginary circle. |
| Rectangle | Opposite sides are equal, internal angles are 90 degrees. |
| Square | All four sides are equal, internal angles are 90 degrees. |
| DONUT command | Produces solid-filled or thick lined circles. |
| Radius | 1/2 the diameter of a circle. |
| ARC continue option | Continues an arc tangent to the previous arc. |
| ERASE command | Deletes objects selected by the user. |
| Concentric | Two or more circles that share the same center. |
| Eccentric | Two or more circles that do not share the same center. |
| Command Alias | Abbreviations that usually consist of the first 1-3 letters of a command name. |
| ESC key | Cancels the previously selected command or action. |
| LINE command | Allows you to draw a line in any direction. |
| ORTHO mode | Forces a line to be drawn either horizontally or vertically. |
| Rubber-Band effect | Stretching effect when drawing command is active that let's you see the arc, circle, line, etc., "grow" on the screen. |
| How do you re-enter the previous command? | Space bar, Enter key, or Right-Mouse click. |
Created by:
tmurphy
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