LEARNING OBJECTIVES

After completing this lesson, you will be able to:

1. Draw an Arc using 10 different methods.

2. Dimensioning an Arc.

ARC

• TYPING = A

• PULLDOWNS = DRAW / ARC

• TOOLBARS =DRAW

There are 10 ways to draw an ARC in AutoCAD. Not all of the ARCS options are easy to create so you may find it is often easier to trim a Circle or use the Fillet command.

On the job, you will probably only use 2 of these methods. Which 2 depends on the application.

An ARC is a segment of a circle and must be less than 360 degrees.

Most ARCS are drawn counter-clockwise but you will notice in the examples on the following pages that some may be drawn clockwise by entering a negative input.

Examples of each of the ARC options are shown in EXERCISES 22A through 22C. Also, refer to the Help menu for additional examples of the use of the Arc command.

DIMENSIONING ARC LENGTHS

You may dimension the distance along an Arc. This is known as the Arc length. Arc length is an associative dimension.

Example:

Select the Arc length dimension command using one of the following:

• TYPING = dimarc

• PULLDOWNS = Dimension / Arc length

• TOOLBARS =Dimension

Command: _dimarc

Select arc or polyline arc segment: select the Arc

Specify arc length dimension location, or [Mtext/Text/Angle/Partial/Leader]: place the dimension line and text location

Dimension text = dimension value will be shown here

To differentiate the Arc...