Drawing Curves - Mastering AutoCAD for Mac - page 452

Follow these steps to draw the joint:
1. Open a new fi le using the acad.dwt template, and save it as Joint2d. Don't bother to
make special setting changes because you'll create this drawing with the default settings.
2. From the menu bar, choose View  Zoom  All, or type Z ↵ A ↵.
3. Click the Polyline tool on the Tool Sets palette. You can also choose Draw  Polyline from
the menu bar or type PL ↵.
4. At the Specify start point: prompt, enter a point at coordinate 3,3 to start your polyline.
5. At the Specify next point or [Arc/Halfwidth/Length/Undo/Width]: prompt, enter
@3<0 ↵ to draw a horizontal line of the joint.
6. At the Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]:
prompt, enter A ↵ to continue your polyline with an arc.
USING THE ARC OPTION IN THE POLYLINE COMMAND
The Arc option enables you to draw an arc that starts from the last point you selected and then select
additional options. Select the Arc option; as you move your cursor, an arc follows it in a tangential direc-
tion from the fi rst line segment you drew. You can return to drawing line segments by entering L ↵.
7. At the prompt
Specify endpoint of arc or
[Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width]:
enter @4<90 ↵ to draw a 180° arc from the last point you entered. Your drawing should
now look similar to Figure 17.2.
FIGURE 17.2
A polyline line
and arc
8. To continue the polyline with another line segment, enter L ↵.
9. Enter @3<180 ↵. Another line segment continues from the end of the arc.
10. Press ↵ to exit the Polyline command.
You now have a sideways, U-shaped polyline that you'll use in the next exercise to complete
the top view of your joint.