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It creates a simple extension along the face normal of the selected edge face:

If an outline sketch is added it creates interlocking geometry to close a profile:

Three profiles with outline sketches to add → three results

Simple Extension

Task Panel

A Task Panel was introduced in version 0.5.00

Double-click an existing Extend object in the Tree View to re-open the Task Panel and edit the parameters.

• Select: Changes the amount of faces in the base Object property.
• Length: Sets the length property.
• Offset A: Sets the gap 1 property.
• Offset B: Sets the gap 2 property.
• Reversed: Toggles the reversed property. introduced in version 0.7.58
• Refine: Toggles the Refine property.

Note: Since version 0.7.57 a different Task Panel will be displayed if the DatiSketch property is not empty. See ExtendBySketch for additional information.

Interlocking Extension

Even though it still can be done this way it is recommended to use the Extend by Sketch command for this task now (version 0.7.57 and above).

(Prepare a sketch for interlocking tabs)

1. Select the edge face to be extended.
2. Invoke the command as described above.
3. Press the OK button to finish the command and close the Task Panel.
4. In the Property View press the … button of the DatiSketch property.
5. The Link dialog window opens.
   • Select the prepared sketch from the list
   • Press the OK button to close the dialog.
6. Set the property DatiUse Subtraction to true to create cut-outs to make room for the extensions.
7. Set the property DatiOffset to adjust the clearance around the extension.

Three profiles → position of the sketches → results without cut-outs → final results

Notes

After inserting a sketch, at least one of its outlines must at least touch one opposite face or the tool will fail to create any extension or cut-out.

Just one outline touching an opposite face is enough to create extension geometry from all outlines of the sketch.

• Each cut-out will have a cuboid shape, no matter what shape the corresponding outline sketch is.

• Shapes other than rectangles may behave little bit strange and even though the object can be unfolded, the result will not turn out as expected.

Three outline sketches and their resulting extensions: separate triangle plate with a rectangular cut-out, circle without clearance → unfold solid is split at an unexpected position

• The extension operation with a linked sketch may fail due to coplanar issues if the face on the sketch side and the face on the opposite side are coplanar, but with opposite orientations. A small offset may help in such a case.

See also: Property View.

A SheetMetal Extend object is derived from a Part Feature object or, if it is inside a PartDesign Body, from a PartDesign Feature object, and inherits all its properties. It also has the following additional properties:

Parameters

Parameters Ext

• DatiOffset (Distance): "Offset for subtraction". Default: 0,20 mm. Clearance for interlocking geometry
• DatiRefine (Bool): "Use Refine". Default: true.
• DatiSketch (Link): "Wall Sketch". Link to the sketch defining the interlocking geometry. Empty by default.
• DatiUse Subtraction (Bool): "Use Subtraction". Default: false Toggles if intersected walls of the same object are cut out for tabs defined by the linked Sketch.