Create and modify 3D models > Modify 3D geometry > Change the radius of a face or an edge
  
Change the radius of a face or an edge
The Creo Elements/Direct Modeling 3D modification commands allow you to modify the radius of tori, spheres, cylinders, cylindrical pockets and holes in a part. You need to specify the radial face or a 3D Annotation radius dimension attached to the face.
If you intend to change the radius of a face with blended edges, you must specify the blended edges you want redone. In this case, the blends are removed, the radius is changed, and the blends are recreated.
The figure shows an example.
To change the radius using a fixed point,
You can change the radius of a face by selecting a point and a new radius. The point and the face normal remain fixed at the selected point. The changed face is kept tangent to its neighboring faces.
You may specify only one point per selection of faces. The point must lie on all the surfaces being changed.
When a radius is changed with a fixed point, the axis of a cylinder, the center of a sphere, or the torus spine are moved. The major and minor radii and the torus center will also change.
1. Click Modeling and then, in the Modify 3D group, click the arrow next to Radius.
2. Click Change Radius or Change Diameter. The Change Radius or the Change Diameter dialog box opens.
3. Select a radial face; press Shift to select multiple radial faces.
4. Select Fixed Point.
5. Click Point. Click anywhere on the radial face to select the fixed point.
6. Type a number in New Radius or drag the guide arrow to the desired radius.
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While dragging the guide (3D CoPilot) arrow, press TAB to toggle between the radius mode and the diameter mode.
7. The Upd Rels option is available when the Parametrics module is active. Select this option to update relations with your changes.
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You can toggle between Realistic and Quick to see realistic feedback or quick feedback while changing the radius of a face. See Realistic feedback.
8. Click to complete the operation.
To change the radius of tori, spheres and cylinders or circular and arc edges,
1. Click Modeling and then, in the Modify 3D group, click the arrow next to Radius.
2. Click Change Radius or Change Diameter. The Change Radius or the Change Diameter dialog box opens.
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To change the radius or diameter of a radial edge, you can:
a. Click Modeling and then, in the Modify 3D group, click More.
b. Click Change Edge Radius or Change Edge Diameter. The Change Radius or the Change Diameter dialog box opens.
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You can also select circular or arc edges in the viewport and click (Change Edge Radius) on the Command Mini Toolbar (CMT).
3. Select a radial faces or edges in the viewport:
◦ Click Radial Faces and select a radial face in the viewport; press SHIFT to select multiple radial faces, or,
◦ Click Radial Edges and select a radial (circular or arc) edge in the viewport; press SHIFT to select multiple radial edges.
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You cannot select multiple edges with a common non-planar face.
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You can use the Change Edge Radius or Change Edge Diameter command to:
• Change the radius of the base of a cone.
• Change the radius of a circular edge of a cylinder to change the cylinder to a cone.
4. If any blends will be affected by the modification,
◦ Select Redo Blend.
◦ To include affected faces other than the default, click Control and select the blended faces.
◦ Creo Elements/Direct Modeling will recalculate these blends so they fit smoothly.
5. Type a value for New Radius or drag the guide arrows in the viewport.
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While dragging the guide (3D CoPilot) arrow, press TAB to toggle between the radius mode and the diameter mode.
6. Fix Elem: Allows you to change the fixed elements of the neighboring faces selected by Creo Elements/Direct Modeling. The fixed elements selected by Creo Elements/Direct Modeling are highlighted in the dark blue color. The elements that you can select as fixed elements are highlighted in the light blue color as shown in the following image.
7. The Upd Rels option is available when the Parametrics module is active. Select this option to update relations with your changes.
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You can toggle between Realistic and Quick to see realistic feedback or quick feedback while changing the radius of a face. See Realistic feedback.
8. Click to complete the operation.
Use the Chain option to change the radius of a chain of tori, spheres, or cylinders.
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If you don't click Keep Tan, the tangential transitions between the radial and flat faces will be lost and replaced by edges. If you switch on the Keep Tan option, the faces adjacent to the radial face are shown in an orange color.
Limitations
• You can specify the new radius of a torus, sphere, cylinder, or cylindrical hole using such a high value that the hole or radial face splits other faces of the part, thus creating additional faces. But you cannot reduce the radius to a value, that the faces would be joined again. If you try, you cause an error message. The same is true if you increase the radius to a value that a further face would be split.
• You cannot delete the radial face with this option. To delete the cylindrical hole or cylinder, use the Modify 3D option for cutting recognized features.
• If you select the Redo Blend option, the system will attempt to recreate the blend with the same blending options. However, in some situations that may not be possible. If the blend was created with the RollAtSharp or RollAtSmooth options, the blend may be recreated without those options.