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Section of a revolution surface |
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In this section:
Objects used as a cross-section
Objects used as a cross-section
You can select one or more model objects as a rotation surface section. Such objects can be:
•sketch (a sketch with several contours, both closed and open, is available),
•closed area in the sketch,
•spatial curve (including contour),
•curve,
•face.
The set of selected objects can be arbitrary.
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Using curves with subordinate curve objects (projection curve, intersection curve, etc.) has specifics. Details... |
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Existing objects (except sketch areas) can be specified before starting the operation. They will be automatically selected as a section. You can only specify sketch areas after the operation has been started. |
Sectional objects can be planar and non-planar, closed and open.
If all objects of the section are flat closed lines, then construction of a closed surface is available (such surface is constructed if the Closed surface option is enabled). Construction of a closed surface is also possible if the section contains both flat and non-planar faces. If there are open or non-planar objects (except for faces), it is impossible to close the surface. Examples of constructing closed and non-closed surfaces are shown in the figure Face rotation.
When selecting a sketch (area in the sketch), note that the section contour must not intersect the axis of rotation (or its continuation). However, some points of the section contour may lie on the axis (or its extension):
•closed loop — any points and/or sections thereof,
• open loop — only endpoints.
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If the sketch contains a line segment with the Axis line style (or an object of the Centerline type) among other objects, then when the sketch is selected as the section, this line segment (object) is automatically set as the axis of rotation. If a sketch area is specified instead of the sketch, the axis is not selected automatically. You have to specify the axis manually. |
If necessary, without interrupting the command, you can draw a contour or sketch and add it to the set of section objects (see below).
•To add an existing object to the set of section objects, specify it in the Design tree or in the graphical area of the model.
Features specifying a sketch and area in a sketch:
•to select a sketch, specify one of its objects in the graphic area of the model or the sketch itself in the Design tree,
•To select an area in the thumbnail, click inside the desired area.
•To create a new object (path or sketch), follow the steps below.
•To draw a contour, click the Draw contour button 
to the right of the Section field. The process of contour creation will start. Specify the objects included in the contour and click the Create object button.
•To build a sketch, click the Build sketch button
to the right of the Section field. The sketch placement process starts, and then the system enters sketch mode to build the geometry. Follow the steps required to build the geometry, and complete the sketch mode operation.
After the contour/sketch creation process is completed, the system returns to the surface construction process. The created contour/sketch appears in the Design tree and is automatically added to the list of section objects.
The names of section objects are displayed in the Section field as a list. You can add objects to the list and remove them from the list.
If the section is a sketch (area in the sketch), you can edit the sketch without interrupting the command. To do this, select it in the Section field and click the Edit 
button next to the field. Similarly, you can edit a contour if it is used as a section.
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If during the rotation of the section around the selected axis two or more points of the section have coinciding trajectories, then the operation is impossible. You have to change the section or the axis. |
