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Section of a rotation element |
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In this section:
Dependency of the rotation operation result on the section
Specifying section of rotation element
Notes on using sketches and sketch areas as section
You can use an object existing in the model — an edge, a curve, a sketch (sketch area) or a face, as a section of the rotation element or create a new object — a contour or sketch — without interrupting the operation.
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Using curves with subordinate curve objects (projection curve, intersection curve, etc.) has its peculiarities. Details... |
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The existing object can be specified before starting the operation. It will be automatically selected as a section. |
Dependency of the rotation operation result on the section
In table are present the features and the result of the rotation operation which depend on selection of a section.
Features of the rotation operation depending on the section object
Object |
Features of the performance and result of the operation |
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sketch (sketch area), face, contour built along sketch lines or by face edges |
•You can select the construction type — toroid or spheroid when the following conditions are met: •the section is open and represents a sketch or contour built along sketch lines or edges of a flat face, •the axis of rotation lies in the section plane. •It is possible to create both thin-walled and solid elements, provided that the section is closed. If the section is open, the choice between a thin-walled and solid element is possible when building a spheroid; in other cases, with the open section a thin-walled element is built. |
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edge, spatial curve, arbitrary contour |
•You can only create a thin-walled element. •Impossible choice of construction type – toroid or spheroid. |
Specifying section of rotation element
To select the rotation element section, use elements of the Main section of the Parameter Toolbar.
•To select an existing object as the axis or the path, click in the Section and specify the desired object in the Design Tree or in the graphic area. Selecting a sketch and a sketch area has features.
•To create a new object (contour or sketch), do the following.
•To construct the contour, press the Construct contour 
button to the right of the Section field. Will start process of creating a contour. Specify the objects included in the contour, and click Create Object button.
•To create a sketch, press the Create Sketch 
button to the right of the Section field. Will start sketch placement process, and then the system will switch to the sketch mode for creating geometry. Perform the steps necessary to build and complete the sketch mode.
After completing the contour / sketch creation process, the system returns to the rotation process. The contour/sketch created appears in the Design Tree and is automatically selected as a section of the rotation element.
The name of the object selected as a section is displayed in the Section field.
If required, you can change the section of the rotation element. To do that, click in the Section field and select the required object.
If the section is a sketch or a contour, you can edit it by clicking the 
icon in the Section field.
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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. |
Notes on using sketches and sketch areas as section
You can either select an entire sketch or an area within the sketch as a section, which is created by the intersection of sketch contours or limited by one of them (see section Using sketches in operations).
•To select the required sketch, specify one of its objects in the graphic area of the model or specify the sketch itself in the Design Tree. In the Section field, the sketch name will be displayed.
•To select an area in the sketch, click inside this area. In the field Section, the sketch name and the word Region will be displayed.
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Note that an area can only be specified in an existing sketch. If a sketch is created when building a rotation element, the entire sketch is selected. |
A sketch may contain one or several contours.
Note the following when you select a sketch as a section.
•Intersecting contours of a sketch result in an element whose section is a merge of areas limited by contours.
•Non-intersecting sketch contours result in:
•an element with holes if contours are nested into each other with nesting level 1,
•an element consisting of separate parts if contours are not nested into each other or if nested with nesting level is higher than 1.
•None of the sketch contours should cross the selected rotation axis (or its extension). However, some points of the contours may lie on the axis (or its extension):
•for closed contours — any of their points and/or areas,
•for open contours — only their extremities.
When selecting a sketch area, the area border should not intersect with the selected rotation axis (or its extension). Some points of the area border may lie on the axis (or its extension).
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If the sketch contains, among other objects, a line segment styled as Axis (or an object of the Centerline type), then when the entire sketch is selected as a section, this line segment (object) automatically becomes 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. |
