Objective



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Objective

To learn to draw and edit circle and arc entities. To learn to use existing drawing objects for accurate point specification.

Exercise

1. Start AutoCAD.

2. Set up drawing to use “Architectural” units.

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Click on the “Format” pull-down menu and select “Units…”.

Set the “Units” to “Architectural” in the dialog box. Notice how the coordinate display has changed to reflect the new style of units. The Engineering and Architectural formats produce feet-and-inches displays and assume that each drawing unit represents one inch. The other formats can represent any real-world unit.

3. Set your drawing limits. During this process, you will specify the drawing area you will need.

Select “Drawing Limits” under the “Format” menu. You will be prompted for sizes in architectural units.

Command: limits

Reset Model space limits:

ON/OFF/

Upper right corner: 42’0”,32’0”

The drawing limits are two-dimensional points in the World Coordinate System that represent a lower-left limit and an upper-right limit. You cannot impose limits on the Z direction.

Drawing limits determine the area of the drawing that can display grid dots, the area displayed by one of the scale options of ZOOM, the minimum area displayed by ZOOM All and the plotted area when “Limits” is chosen in the PLOT command.

Make sure you do not enter a hyphen between the feet and inches. Although AutoCAD prints architectural units with hyphens it cannot read them with hyphens.

You can specify the unit type according to your drawing's requirements: architectural, decimal, scientific, engineering, or fractional. Depending on what you specify, you can enter coordinates in decimal form or in feet, inches, and degrees or in other notation. To enter architectural feet and inches, indicate feet using the prime symbol ('): for example, 72'3,34'4. You don't need to enter quotation marks (") to specify inches that follow feet.

Notice here that you are setting your drawing to draft the fountain in full scale. This is the preferred scale at which you should make your drawings in AutoCAD. When it comes time to print your drawing, you can always adjust the plot parameters to reproduce it at the correct scale.

4. View the entire drawing area.

Pick “Zoom All” from the “View” menu to see the entire drawing area you just defined.

Zoom All will display the entire drawing in the current viewport. In a plan view, AutoCAD zooms to the drawing limits or current extents, whichever is greater.

5. Turn on SNAP and GRID. Sometimes, if the grid you are trying to display is too dense to be useful, AutoCAD will issue a warning message and refuse to comply:

Command:

Grid too dense to display

This just means that you should set a more realistic GRID spacing. You might also want to set the SNAP settings to something sane and useful. Note: Neither GRID nor SNAP is necessary for this assignment.

6. Draw the fountain and corner site shown in the figure. Include everything shown above, but do not include the notes, dimensions and construction lines. Draw everything full scale, as accurately as possible. Do not just eyeball things. Make use of the dimensions and the notes in the drawing. You may need to use a variety of object snapping modes and circle and arc entry methods. You will also need to use the FILLET, TRIM, OFFSET, EXTEND and HATCH commands. Try these commands and familiarize yourself with the way they operate. You may also find it useful to rotate the SNAP or GRID, set up your own UCS, or draw temporary construction lines to create placeholders to snap to.

As you draw the fountain, you may find that you do not have it centered very well within the drawing limits; in fact, parts of your drawing may be outside the drawing limits you specified. Do not be bothered too much by this. It is easy to move all of the objects in your drawing for a balanced composition before plotting. Even though AutoCAD expects you to specify drawing limits, it does not force you to limit your drawing activity to within this region.

Before attempting to HATCH the brick pattern, set the UCS to the lower right end of the diagonal line shared by the two patterns (the miter joint). The origins of hatch patterns always coincide with the origin of the UCS. In this case, setting the UCS will force the rows of mitered bricks (horizontal angled) to begin with a full brick. Make sure you set the UCSICON to follow the “origin” before moving the UCS. Also, you must rotate the UCS to 80 degrees before creating the angled brick hatch.

The UCS icon represents the orientation of the UCS axes and the location of the current UCS origin. It also represents the current viewing direction relative to the UCS XY plane.

View menu: Display UCS Icon

Command line: ucsicon

A plus sign (+) appears at the base of the icon when it is positioned at the origin of the current UCS. The letter W appears in the Y portion of the icon if the current UCS is the same as the World Coordinate System.

7. Add your name and student ID number in the lower right corner of your drawing.

There will be little room for these two text strings so choose a small character height.

8. Plot the drawing at 1/4” = 1’ scale.

Make sure you erase any construction lines you may have drawn in the drawing.

Near the left edge, check the box labeled “Limits.” This means that AutoCAD will plot everything within the drawing limits.

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In the “Plot scale” check box, make sure “Scaled to Fit” is not chosen. This option will generate a plot at some arbitrary scale to accommodate the entire drawing on your paper size.

Choose a scale of 1/4” = 1’ to indicate that a 1’ long line in your drawing will plot to a size of 1/4” on paper.

Verify that your settings are all satisfactory by doing a full preview. If your drawing does not fill most of the page or if it hangs out of the side of plot, recheck the settings described. If it still does not seem to turn out right, you may have to specify the rotation and offset at which the plot will be drawn. You should use full or partial previews to check the positioning of your drawing after any changes you make. Do not keep making plots to check the positioning of your drawing.

Click on the “OK” button when all the settings seem to be satisfactory,.

Please remember this procedure for plotting a drawing to a specific scale. You will need to use it again later in the term to do most of your plots.

9. Draw the other three corners. You need to only draw the street edges and sidewalks which make up the intersection of the road; that is, the four corners which face each other and form the intersection. Assume the street is very narrow. For this plot you can “Scale to Fit.”

10. Further embellish the drawing. Try adding trees, more hatching, draw another fountain, etc. Plot the embellished drawing.

11. Save your work, make backups if needed, and logout.

For the remainder of the assignments you will be graded on PRESENTATION. This includes good placement of drawing on the plotted page; good placement of ancillary text; pages not crumpled; etc. A maximum of three points could be subtracted.

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Plot the fountain drawing without embellishments at 1/4” = 1’ scale.

For the “other three corners” plot you can “Scale to Fit.”

Plot the embellished drawing (Scale to fit).

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