Applying a controlled modification to two faces of a solid

In this job you will apply a controlled modification to two faces of a solid, by changing their common edge. Proceed as follows.

1 Open file "ZM.e3".



Start the Zone Modeling command. You will modify the common edge between the front surface and the top one, so as to make it match with the blue arc.

2 Select the two faces the controlled modification must be applied to.
3 The Show Warnings button ( ) is displayed on top of the selection list. When you click it, a message warns you you haven't set any preserving condition along the boundaries.



Click AutoPreserving: preserving conditions will be automatically applied along all the boundaries of the selected faces and the previous message will disappear.
4 You will now have to select both the common edge of the selected faces and the blue arc you want it to coincide with.
  • Under Matching, in the Matching drop-down list, if not already selected, select Curves
     
  • Select Initial curves under Matching curves, Group1. Then click on the common edge of the two faces.


     
  • Select Target curves. Then click on the blue arc.
5 The Constraint drop-down list is displayed:



Check the constraint is set to Target position. If the More Options node is expanded, the Law drop-down list is displayed, enabling you to choose the face behavior close to the common boundaries. Set Law to Parametric.

6 Click the Preview button ( ) to display a preview of the result.



To check the precision values you obtained, you can click the Show Warnings button ( ).

You can check the results you obtained as described in "Checking your results".

7 Click or to confirm your selections and modify the shape of the object.



Click to discard your changes.
While you are using the command, you can select the Hide check box to temporarily hide the original entities, in order to better appreciate the changes you are making. The entities will be hidden only as long as the command is being executed.

Gap between the modified surfaces and the other ones
If, after the modification, the gap between the modified surfaces and the other ones is not negligible, a message is displayed when you try to apply the command (using Apply (  ) or OK ( ) to let you know that, though the solid can be created as it is, keeping such a big gap value might cause troubles in future developments.
The set of options provided to manage the shape of the controlled modification (stiffness, roundness, bulging) and especially the ones affecting precision) can be used to reduce the gap to an acceptable value.
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