一个老外写的可变截面扫描的总结教程

一个老外写的可变截面扫描的总结教程内容摘要：

s normal to the origin trajectory. Let39。 s give an angular value to the origin trajectory. The system will try again to build the surface along the three curves, but always normal to the origin. I will angle the curve at 45 degrees... ...and the result is: The result is a surface always normal to the origin and along the three curves. Example 4 Norm to Traj In this example I will use the Normal to Trajectory option of VarSecSweep to sweep the cross section normal to a selected curve other than the origin trajectory. Use the previous example to create the curves, but in this example we need to create an extra curve that will define the cross section normal. Follow the same steps and when the systems asks for you to define the NormToTraj, select the curve (is the curve near the origin). Sketch the section as before, spline then three centerlines and then make the spline tangent to the centerlines. If you follow right the steps you will e up with the following result : As you can see the created surface is always normal to the curve we selected as normal to. Example 5 Pivot Dir Now I will use the Pivot Dir option to create a VarSecSweep. I must specify a reference (datum plane, curve or axis) so that the cross section remains normal to that reference. If I select a curve that is not linear, then we must select a datum point along the curve to make tangent and the system determines the perpendicular. I will now create a surface shown below using the Pivot Dir option. First, create three curves as shown below (2d curves): We will use the right plane as the plane which the section remains normal to, then select the straight vertical curve as the origin, and then the other two curves as the additionals (use the curve chain option to select these curves). If you follow the steps right the system orients you (in sketcher) as shown below. Connect the two reference points with a spline. Create two centerlines (align them through the reference points). Then make the spline tangent to these centerlines. OK, and done, see the result. As you can see, the section runs through the two given curves but is always normal to the selected plane. We have seen now the option we have when we select to create an advanced surface using the VarSecSweep and select the NormTo Origin Traj, Norm To Traj, or Pivot Dir options. Now I will show you how to create the above surfaces using a relation in order to create more advanced surfaces. Example 6 Trajpar Relation I will show you through advan。