Sketcher External

From FreeCAD Documentation
Revision as of 19:37, 28 December 2013 by Spacether (talk | contribs)

Sketcher_External

Menu location
Sketch → Sketcher geometries → Sketcher External
Workbenches
Sketcher, PartDesign
Default shortcut
E
Introduced in version
-
See also
ConstructionMode

Description

This tool pulls solid line geometry into your current sketch. Once these lines are pulled in, they will appear as magenta lines in the current sketch, and you can constrain and dimension sketch curves to them.

This is useful because it lets you constrain you sketch back to nearby solid edges.

You can ONLY pull in lines and edges that are on the same plane as the sketch plane. Only solid lines/edges can be pulled into the sketch, NOT 2D sketches or draft lines.

One can use this to dimension one sketch off of another using the following order of operations:

  1. Make sketch#1
  2. Pad or extrude it to make a solid, solid#1
  3. Make sketch#2 on the same plane as sketch#1
  4. Pull in solid#1 lines into sketch#2
  5. Pad or extrude sketch#2 to make solid#2

Use

  • Start a sketch on face of a solid (Click on the solid face, then click the create sketch button)
  • Click the 'Sketcher External' button
  • Select, select the solid line that you want to pull into the sketch (remember this must be on the same plane that the sketch is on)

If the line is successfully pulled in it will have a magenta color. If it was not pulled in, it will remain green.

External geometry magenta lines can be used like Contruction lines. Construction lines are lines that are internal to the sketch and will be used for constructing geometry only, and not for later solid operations, like extrusions.

External geometry magenta lines can be used as construction lines too, because they will not appear as sketch lines once you exit the sketch. But remember the external geometry magenta lines are parametrically linked back to a solid face.

Example

The magenta lines are External Geometry selected on two objects of the same extrusion products with previous sketch. In this case they are used to create the constraints of tangency with the circumferences. The line on the smaller rectangle is not used.

The active sketch with the basic forms hidden and external geometries visible.

When the sketch is closed, External Geometry lines are not visible.