Move Boundary
This functionality is available on Onshape's browser, iOS, and Android platforms.
Move boundary edges of a surface in order to extend or trim it.

In the Feature toolbar:



The Move boundary feature allows you to move boundary edges of a surface in order to extend or trim it. Click the Move boundary feature tool on the toolbar. Select the surface or boundary edges to move. Choose an end condition with the dropdown arrow. By default, Blind is selected. Enter a distance numerically in the dialog, or use the orange arrow in the graphics area. Click the Opposite direction arrow to flip the boundary direction. Check Maintain curvature to make all the extended surface curvature continuous with the original surface boundary. Selecting Up to face or Up to part/surface allows you to select an entity for the boundary end condition. Selecting Up to vertex allows you to select a vertex for the boundary end condition. Click the green checkmark to accept the new boundary.
Steps
- Click
.
- Select a surface or boundary edges to move:
-
Adjust the settings in the Move boundary dialog box to your preference.
- Choose an end condition with the dropdown arrow:
Blind - Enter a distance manually to extend or trim to.
Up to face - Select a target entity to extend or trim to.
Up to part/surface - Select a part or surface to extend or trim to.
Up to vertex - Select a vertex to extend or trim to.
- To trim a surface or boundary edge, you have the option to enter a negative distance in the Distance field of the dialog box:
Click the opposite direction icon
, or manually drag the manipulator arrow back (shown below):
- Check the box next to Maintain curvature to make all the extended surface curvature continuous with the original surface boundary.
- Check the box next to Tangent propagation to extend the surface for all edges tangent to the first edge selection.
-
Click the green check mark
in the upper right corner of the dialog box to apply your changes . Click the
to cancel without applying your changes.

Steps
-
Tap
.
- Select a surface or boundary edge to move.
- Adjust the settings in the Move Boundary dialog box to your preference.
- Choose an end condition with the side arrow:
- Trim a surface or boundary edge by tapping the opposite direction switch or manually drag the manipulator arrow back.
- Tap the Maintain curvature switch to make all the extended surface curvature continuous with the original surface boundary.
- Tap the Tangent propagation switch to extend the surface for all the edges tangent to the first edge selection.
Blind - Enter a distance manually to extend or trim to.
Up to face - Select a target entity to extend or trim to. (When Up to face is selected, you can tap the Mate point connector icon to select or create inferred Mate connectors.)
Up to part/surface - Select a part or surface to extend or trim to.
Up to vertex - Select a vertex to extend or trim to. (When Up to face is selected, you can tap the Mate point connector icon to select or create inferred Mate connectors.)
- Tap Checkmark.

Steps
-
Tap
.
- Select a surface or boundary edge to move.
- Adjust the settings in the Move Boundary dialog box to your preference.
- Choose an end condition with the side arrow:
- Trim a surface or boundary edge by tapping the opposite direction switch or manually drag the manipulator arrow back.
- Tap the Maintain curvature switch to make all the extended surface curvature continuous with the original surface boundary.
- Tap the Tangent propagation switch to extend the surface for all the edges tangent to the first edge selection.
- Tap Checkmark.
Blind - Enter a distance manually to extend or trim to.
Up to face - Select a target entity to extend or trim to.
Up to part/surface - Select a part or surface to extend or trim to.
Up to vertex - Select a vertex to extend or trim to.