Inspection >> Geometric Tolerance >> Cylindricity

• Inspection >> Geometric Tolerance >> Straightness >> Cylindricity command calculates and displays the cylindricity of a selected geometry as the radius difference between two concentric bounding circles.

Step   

Execute  Inspection >> Geometric Tolerance >> Cylindricity command as follows:

1. Select Inspection >> Geometric Tolerance >> Cylindricity from the menu or click the corresponding icon from the Inspection toolbar.

 2. Click the right mouse button, if there is no visible Section Deviation, this shortcut menu appears:

    If there is visible Section Deviation With Surfaces (or With Polygon or With Curves), this shortcut menu appears:

Click On Vertices to select a geometry composed of vertices, or On Surfaces to select surfaces, or On Curves to select curves, or On Faces to select a geometry composed of polygonal faces, or From Surfaces to select surfaces, then calculate the cylindricity for the vertices around them, or Pick Ref. Vector to select a reference vector and use it as the normal of the bounding circles.

 3. After select proper geometry, click Done on the right mouse button shortcut menu.

 4. Select a place to position the Cylindricity text box.  

Result

• In addition to displaying the circularity value, this function plots the two bounding circles and the radius difference between them.

                

       Plus, Geometric Tolerance Information is displayed in output window as follows,  

       

        ----------------------------------------

        Geometric Tolerance Information

        ----------------------------------------

        * Name: Cylindricity 20

        * Cylindricity : 5.378mm

        * Axis Center: 16.262, -14.590, -26.001

        * Axis Direction: -0.081, 0.369, -0.926

        * Axis Length: 12.717mm

        * Inner Radius: 2.941mm

        * Outer Radius: 8.320mm

        * Average Radius: 5.607

        * Standard Deviation : 0.955

        * Region Type : User selected vertices

 

 Note

• Smaller cylindricity value indicates a more cylindrical geometry. Zero value indicates a completely cylindrical geometry.
• This command calculates the best orientation for placing two concentric cylinders containing the selected geometry between them so that the radius difference is minimal. This radius difference is the cylindricity of the selected geometries.
• All Cylindricity are registered to the Geometric Tolerance node in the Project Tree Window.
• The difference between the RMB menu options beginning with On ... ( such as On Curves, On surfaces, On Faces, etc) and those beginning with From ... (such as From Curves, From Surfaces, From Faces, etc) is: when you select On ..., you can use the geometries on only one scan shell; but when you select From ..., you can use the geometries on many scan shells.