Lab Session 1
To learn about AutoCAD
Learn about line command
Learn about X,Y co-ordinate system
Definition of Engineering Drawing
An engineering drawing, a type of technical drawing, is created within the technical drawing discipline, and used to fully and clearly define requirements for engineered items.
A drawing consisting of at least three views (front, top, and side) of an object.
What is CAD
An abbreviation for computer-aided (assisted) drafting or computer-aided (assisted) design. CAD software is used to design or document physical structures or objects.
CAD allows you to accomplish design and drafting activities using a computer.
A CAD software package, such as AutoCAD, enables you to create designs and generate drawings to document those designs.
CAD is a tool that can be used for design and drafting activities. CAD can be used to create a 2D or 3D computer model of the product or system
WHY WE USE CAD?
Although there are other methods used for design and drafting activities, CAD offers the following advantages over other methods in many cases: 1. Accuracy
2. Productivity for repetitive operations
3. Sharing the CAD file with other software programs.
WHY USE AutoCAD?
Previously, only manual drawings were made on drawing board which was so much hectic and time wasting.
Now CAD systems are available for a number of computer platforms: laptops, personal computers (PCs), workstations.
Easy to Modify: Modifying the CAD geometry is easy; you will always have "copy", "cut", "paste", "delete", "move" or some similar editing options available with each of the packages.
Easy to Reproduce: Draftsmen used to take days to complete a drawing by manual drafting, and reproducing the drawing meant RECREATING the drawing from the beginning.
Use in EE
In Industries, Project sites and Offices we use drawing to implement the projects.
All the activities of any project or assignment first design on paper, then it can be implemented.
In power transmission lines all of the data of towers and their stringing first made on drawing then it is implemented.
The Line Command
The Line command is used to draw segments of straight lines. On the Ribbon, make sure you are in the Home tab. Using the Draw panel, click the Line button.
The following prompts will appear:
Specify first point: (type in the coordinate of the first point) Specify next point or [Undo]: (type in the coordinate of the second point) Specify next point or [Undo]: (type in the coordinate of the third point)
Specify next point or [Close/Undo]: (type in the coordinate of the fourth point) You can use the Undo option at any time to undo the last specified point, hence the last specified segment.
After you draw two segments, the Close option will be available to connect, the last point to the first point and to end the command.
Other ways of ending the command include pressing [Enter] or [Spacebar]. You can also press [Esc] to end the Line command.
Using Dynamic Input
By default, the Dynamic Input is turned on, so anything you type in the Command Window will appear on the screen beside the AutoCAD
Make sure the Dynamic Input button is turned on:
For example, if you type the word “line,” here is how it will look on the screen:
ƒ When you press [Enter], the following will appear:
Type the X coordinates, then press the [Tab] key and you will see the following:
Type the Y coordinates, then press [Enter] and Dynamic Input will show the length and the angle of the line to be drawn (the angle is measured from the east and incremented by 1 degree).
Specify the length, press the [Tab] key, then type the angle and press [Enter]:
Precision Method 1: Snap and Grid
As you can see, the only method we used to precisely specify points in the
X, Y plane was to type the coordinates using...
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