Trimming surfaces against other surfaces

Surface-Surface Trimming trims a surface against another surface.

Note: The model must contain two intersecting surfaces.

To use Surface-Surface Trimming:

1. Select Construct tab > Surfaces panel > From N Surface > Surface-Surface Trim to display the Surface-Surface Trimming dialog.
2. Select Create new surface(s) to create a new surface or Modify existing surface(s) to trim the selected surface.
3. Optionally enter a name in the Surface name field. This field is available only if Create new surface(s) is selected.
4. Select a surface from the Trimming Surface list and click the Add item from list button, or click the Pick surface button and select it in the graphics window. Picking the surface in the graphics window tells FeatureCAM which side to keep.
5. Optionally select Trim this surface also, then select a side from the Side kept list.
6. Select a surface from the Trimmed Surface list and click the Add item from list button, or click the Pick surface button and select it in the graphics window. Picking the surface in the graphics window tells FeatureCAM which side to keep.
7. Repeat step 6 to select more surfaces to trim.
8. If you want to change which side of the surface is kept, select a surface from the Surface list and click to toggle whether trim is decided by pick location.

   The options for Side kept are:

   • Pick location - keeps the portion of the trimmed surfaces where you picked with the mouse.
   • Normal - keeps the side of the trimmed surfaces that are on the opposite side as the normal of the trimming surface.
   • Reverse - keeps the side of the trimmed surfaces that are on the same side as the normal of the trimming surface.
9. Enter a Tolerance. This determines the accuracy of the trim.
10. Click Preview to display a preview of the surface in the graphics window.
11. Click OK.