 Click on  and Project
Open EngineeringEnginePiston
Create the points
 Draw an arc of points  at  27, rotated 15 degrees each around to 90 degrees
Draw an arc of points at 30, rotated 15 degrees each around to 90 degrees
Create more points
Draw another arc of points as illustrated
Copy the outer arc
Copy the outer arc up to  60
Copy the inner arc
Copy the inner arc up to 20
Draw lines
Draw the lines as illustrated
Draw triangles
Rotate the view as illustrated
Draw the triangles  as illustrated
Move points
Move the points at the bottom of the piston up
to 9
Move points
Move the next set of points on either side up
to 7
Mirror the piston
Press the mirror  button to automatically mirror the piston
Press Save to save the model
(click here to go back)
| 
