Offset

The Offset transformation creates a feature to expand or to contract the selected features by a specified distance. A positive offset expands the volume while a negative value contracts the volume. The same offset is applied to the volumes of each selected feature.  If a positive offset is specified, each of these features expands by the offset maintaining the wall thickness.

 
Open the Offset.CATPart document.

 

 

  1. Click the Offset icon .
    The Offset dialog box is displayed.

  2. Select Pocket.1 as the Features to offset.

    3. Distance

    It is the distance to move each of the faces of the bodies that are being transformed. The distance of all selected features will be applied to expand the volume, if the distance value is greater than 0.0.  And if the distance value is less than 0.0, it will be contracted. The default value for the Distance is “0.0”.

  3. Enter 5mm for Distance.

  4. Click OK.

  5. Select Pocket.1 from the specification tree.

  6. The Pocket dialog box is displayed.

  7. Select Fillet tab and uncheck Lateral radius checkbox.

    8. Constant fillet walls may not be retained when the offset is applied. If the walled feature, in this example the Pocket feature, has the Constant wall thickness option checked and the lateral faces are filleted (A), the constant walls will be retained with the Offset Feature Modifier. However, if a walled feature has constant fillet walls and lateral faces are not filleted (B), the constant walls will not be retained at the corner.

    (A) Pocket with constant walls and lateral filleted
    (B) Pocket with constant walls and no lateral filleted