CREATING AN ARC AND ELLIPSE

BASIC CAD DRAW COMMANDS

Objectives: • Define an Arc

• Identify the different options in creating the arcs and ellipse.

• Draw simple to complex design.

• Develop the creativity and resourcefulness in creating complex design.

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Radius command

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Radius – is the distance from the center of the circle to the outside edge.

Diameter command

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Diameter – is the longest distance across a circle.

ARC command

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Arc – is a segment of the circumference of the circle.

ARC command - To create an arc, you can

specify various combinations of center, endpoint, start point, radius, angle, chord length, and direction values.

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ARC COMMAND

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HOW TO USE COMMAND ARC IN AUTOCAD.MP4 VIDEO

ARC COMMAND

HANDS – ON EXERCISES

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ARC command

1. Locate and left-click on the Arc icon in the Draw toolbar.

2. Specify a start point near the center of the drawing area. Then click two

Material more places on the drawing area and observe how the arc is created. This is

a 3-point method, similar to the 3P option in the Circle command.

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ARC command

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4. Try the arc center method. The important thing to consider here

is that AutoCAD creates arcs counter-clockwise. Left-click on the Arc icon

and enter “c” at the command prompt followed by the Enter key.

5. Once more, position the crosshairs in the center of the screen and left click.

ARC command

6. For the start point of the arc, left-click to the right of the center point you just

material defined in step 4. For the end point move the crosshairs to the left of the center point and left-click. Note how the arc “sweeps” counterclockwise, over

the top of the center point.

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ARC command

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ARC command

7. On your own, create another arc opposite of the first one using the center

option, so your drawing area looks like this:

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ARC command

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8. Try the continue arc method. Create a small, Open arc in the lower left-hand corner of the screen using the three point (default) option. 9. After specifying the last point, press the spacebar on your computer keyboard twice. What happens?

ARC command

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10. The Arc command should start again and pick up where you left off, tangent to the last arc. Continue this method until you create a drawing similar to the diagram below.

ARC command

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References: CAD video tutorial.com www.google.com AutoCAD 2009 by AUTODESK