2009

Invert a vector
1 In the browser, right-click 2D Contact joint (door:1, pillar:1), and then
select Properties.
2 Click the Invert normal button.
3 Click OK.
4 Return to the isometric view, change the value for Images to 4000, and
then click Play on the Simulation Panel. The door contacts the tab stop.
5 Click the Stop button.
6 Click the Activate construction mode button.
In reality, the swing of the door is not controlled by gravity, but is positively
controlled by some device or mechanism. In this example, you add a spring
damper to provide the force needed to close the door and hold it against the
tab stop.
Add a spring
1 Drag the door until it rests near or against the tab.
2 Double-click the Gravity node, and then check Suppress.
3 Click OK.
4 Click the Insert Joint tool, and then select Spring/Damper/Jack.
5 Select the circular edge on the jack body. In this case, the selection point
is the center point of the arc.
66 | Chapter 9 Construct Moving Assemblies