Changing a Sketch Support
||This task shows you how to change the position
of a sketch by changing its support. Changing a sketch support amounts to
editing the absolute axis definition of the sketch.
In this scenario, you will edit the absolute axis definition of
Pocket.2/Sketch.3 by making it associative to Pocket.1.
This will ensure that, when moving Pocket.1, Pocket.2
follows Pocket.1 without requiring you to edit the geometry of
From the specification tree, right-click Sketch.3.
and select Sketch.3 object > Change Sketch Support....
If a message appears, informing you that if you change its position, the
sketch may become inconsistent or over-constrained, simply click OK.
The Sketch Positioning dialog box appears.
If the Move geometry option
at the bottom of this dialog box is checked, uncheck it. This will
prevent the geometry from moving when performing the next operations in
the dialog box.
In the Type field in the Sketch Support area, three
options are available:
- Positioned: positions the sketch using the origin
and orientation of the absolute axis.
- Sliding: default type used for non-positioned
sketches (i.e. when you edit a non-positioned sketch, this option
will be selected by default, as is the case in our example). This
option is mainly used for compatibility purposes, and to enable you
to turn non-positioned sketches into positioned ones.
With the Sliding option, the sketch is not positioned,
i.e. the origin and orientation of the absolute axis is not
specified. As a result, its absolute axis may "slide" on the
reference plane when the part is updated.
- Isolated: isolates the sketch in
order to break all absolute axis links (support, origin and
orientation links) with the 3D or to solve update errors. Only the
3D position will be kept, to ensure that the sketch does not move.
With the Isolated option, you cannot define the sketch
support, origin and orientation.
Select the Positioned option, and make sure
Pad.1/Face is selected as the reference element for the sketch
support (Reference field).
At this point, check the Move geometry option
to specify that, from now on, the geometry should be moved when the
sketch position is modified.
Check the Swap box to swap H and V directions.
The new sketch position is previewed in the geometry area.
You are now going to make the absolute axis associative
Uncheck Move geometry once again to ensure
that the geometry does not move according to the newly defined axis.
In the Type field in the Origin
area, select Intersection 2 lines.
You will now specify the reference element for the
origin. To do this, make sure the Reference field is active,
and select a horizontal edge of Pocket.1 as shown below.
Now, select a vertical edge of Pocket.1 as shown below.
In the Orientation areas, leave the Type field
set to Implicit and the Reference field set to No
Selection. For more information on the other options available in
the Origin and in the Orientation areas, refer to Creating a Positioned
Sketch in the Sketcher User's Guide.
The absolute axis definition of Sketch.3 is modified and the
position of the pocket is changed.
From the specification tree, double-click Sketch.2
to edit it.
On the sketch, double-click the the offset value as
In the Constraint Definition dialog box which
is displayed, enter a new value, 90 for example, and click OK.
The constraint is updated, and Sketch.2 is moved accordingly.
Exit the Sketcher workbench. As you can see,
Pocket.1 has been moved, and Pocket.2 is still
positioned according to the absolute axis you defined for Sketch.3.