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Einleitung

Das Ziel dieses Artikels ist es, einige zurzeit fehlende Funktionen von FreeCAD aufzulisten und Lösungen (Workarounds) aufzuzeigen, wie man diesen "Fehler" umgeht. Dies kann für neue Anwender, die bestimmte Funktionen in FreeCAD nicht finden, hilfreich sein.

Workarounds für den Arbeitsbereich Sketcher

Nr. Fehlende Funktion Workarounds
1 Auto snap to objects (geometric centers, quadrants, extensions, intersections)
2 Check geometric and mass properties of the sketch (area, center of mass, second moments of area and so on)
3 Possibility to use the results of the External Geometry tool directly for operations on the sketch
  • Manually trace over the geometry created by this tool
  • Link Branch - Defining Geometry tool
4 Project multiple edges at once with the External Geometry tool when a face is selected
  • Project edges individually
5 3D sketches
6 Projection of cut edges when making a sketch on a plane cutting through an object
  • Create a Link from the object, and slice that object to get actual cut edges
7 View section tool showing filled cuts
  • If the sketch is plane-parallel to one of the main planes of the global coordinate system: use Part SectionCut
8 Diameter dimension with respect to a symmetry axis for revolved parts
  • Create a radius dimension instead (you can enter the diameter divided by 2 - the calculation will be handled by FreeCAD)
9 Dimension labels adapting to the rotation of the view to be always readable
  • Rotate the view when needed
10 First dimension in the sketch scaling the geometry so that its initially drawn shape is not broken
11 An option to hide the whole construction geometry in an active sketch
  • In the Elements window, use the Construction filter, select the construction geometry entities there and uncheck their checkboxes

Workarounds für die Arbeitsbereiche Part und Part Design

Nr. Fehlende Funktion Workarounds
1 Check the geometric and mass properties of the model
2 Display the center of mass of the model (part or assembly)
3 Clipping plane that doesn't make the model look like it's hollow
  • Change the Lighting property in the part's view settings to "One side" (very rough equivalent, problem with multicolored parts)
  • Persistent section cut tool - deselect all planes before pressing Close
  • Link Branch - experimental renderer
4 Creation of an axis on the intersection of 2 planes and a plane midway between two faces/points, possibly more variants for datum creation
5 Automated midsurface extraction (for thin-walled parts)
  • Use Draft Facebinder and then Draft Scale or Part Offset (easier) to make it actual midsurface, apply the workaround for extending faces if the generated midsurfaces are separated and join them with boolean tools
6 Project (map/wrap) sketches on non-planar (e.g. cylindrical) faces
7 Select which part of the sketch to pad
  • Select one by one all edges forming a closed contour to pad
  • Select edges from the sketch and create a SubLink or a SubShapeBinder and pad that new object
  • Pad a complete sketch located on the existing face of the model in the opposite direction (towards the existing shape) so that only new faces are created. Then it is possible to select these faces individually and pad them. This method should be used with caution since unnecessary 3D operations may lead to unexpected errors. Thus, it is recommended to use the previous workaround instead.
  • Link Branch - Export Single Geometry and Export Multiple Geometries tools or automatic SubShapeBinder created when edges forming a closed loop are selected from the sketch before padding
8 Fillets and chamfers that can consume adjacent faces/edges
  • Make fillets with a slightly smaller radius (e.g. 6.4999 instead of 6.5 mm)
  • Model these features directly using other operations, such as PartDesign Pocket or already include them in the sketches
9 Variable radius for the PartDesign Fillet tool
  • Use the Part Fillet tool which supports a variable radius
10 Parametric curves
11 Cosmetic threads
  • Add cosmetic threads on the TechDraw page
  • Model true threads, for holes those can be generated automatically using the Hole tool
12 Partitions (splitting surfaces and volumes with sketches and datum planes while keeping the number of parts unchanged)
13 Guide rails for Additive Pipe and Additive Loft or their equivalents in the Part Workbench
14 Twist for PartDesign AdditivePipe or Part Sweep
15 Bending existing parts
16 Pattern along a curve
17 Cut scope - cut tools affecting only selected part of the model
18 Merging adjacent faces
19 Hole tool using points from sketches
  • Draw circles for the Hole tool
20 Datum points from coordinates
21 A tool for automatic creation of ribs (structural reinforcements)
22 A tool for automatic creation of domes
23 Extending faces up to other faces (useful e.g. when extracting midsurfaces, as mentioned above)
24 Fuzzy versions of Part Boolean operations (possibility to specify a tolerance for boolean union and other operations)
25 PartDesign AdditiveLoft and PartDesign AdditivePipe with a possibility to use an open profile as the first or last section
26 A tool to sweep a circular profile of a given diameter along a selected path
  • Draw the circular profile manually
27 Optional local coordinate system display for datum planes

Workarounds for the Draft Workbench

No. Missing feature Workarounds
1 Snap to apparent intersections of curved edges, perpendicular extensions, arc extensions, geometric centers and tangent points
  • Use the other available Draft Snap tools and a more manual approach with construction geometry
  • When working on the XY plane: create a (temporary) projection of the geometry with Draft Shape2DView
2 Keyboard shortcuts for Draft Snap tools
  • Snaps can be activated and deactivated using keyboard shortcuts but only when none of the input boxes in the task panel has the focus (so the user should click in an empty space of the task panel to be able to use shortcuts for snaps)
3 Automatically change the colors of objects back to 'normal' when removing them from the construction geometry group
  • Move the objects to a layer with the correct color settings
  • Change the colors manually
4 An option to quickly switch between the three main working planes and their projections at the selected point (for 3D drafting)
5 AutoCAD-like command line input
6 Hatch a region enclosed by wires
  • Create a face (a hatch can only be applied to objects with planar faces):
    • In case of a single closed wire: set its Make Face property to "true", and its Display Mode to "Wireframe"
    • Upgrade multiple wires two or three times until you have a face, or a single closed wire (see above)
    • If the wires must stay separate, but are connected end-to-end, create a SubShapeBinder from them
    • Trace over the region with a closed wire (not parametric)

Workarounds für den Arbeitsbereich TechDraw

Nr. Fehlende Funktion Workarounds
1 Broken out and rotated/removed section views
  • Use the Slice apart tool to physically cut the model and then create its view
2 Auto diameter dimension on side views
  • Manually add the diameter symbol
3 Manually add geometry to generated views
4 Shaded views in drawings
  • Place screenshots of the model on a white background on the TechDraw page
5 Ordinate dimensions
  • No known workaround
6 Exclude ribs from hatching
  • In some cases it might be sufficient to use the first workaround mentioned here and manually create a section with a custom cutting line
7 Export of TechDraw pages as PDF without making the text from the template (path text) unmarkable/unsearchable.
  • Export the page as SVG. Then convert the SVG to PDF by using e.g. Inkscape or open the SVG in a web browser and then save or print as PDF.
8 Rechteckauswahl von TechDraw-Ojekten
  • Objekte manuell auswählen, eins nach dem anderen (dabei Strg gedrückt halten)
9 Modify regular and section views using sketching tools
  • Manually create and modify the views:
    1. If a section view has to be modified, use the Part SectionCut tool or boolean operations to cut the part in the same way as it would be done by the section view tool
    2. Use the Draft Shape2DView tool to create a 2D line representation of the view or section view
    3. Use the Drafting tools with proper snaps to modify the view
    4. Use the Draft Draft2Sketch tool to create a sketch out of the Draft objects
    5. Use the Sketcher ValidateSketch tool to make sure that the sketch has no missing coincidences, doubled lines and so on (those issues may impact the face selection in TechDraw)
    6. Use the TechDraw View tool to create a view of the sketch in TechDraw.
10 Auxiliary views
  • Create a standard view from the correct direction. Workarounds for "View normal to a face" may help. Rotate and position the view as needed.

Workarounds für den Arbeitsbereich FEM

Nr. Fehlende Funktion Workarounds
1 Beams with arbitrary cross-section
  • Manually edit the input file and modify the beam section definition
2 Distributed load on beams
3 Support for multiple meshes and thus possibility to define contact between touching (not separated) faces
4 Advanced material models (hyperelasticity, creep and so on)
  • Manually edit the input file and add proper keywords for material definition
5 Composite shells
  • Manually edit the input file and modify the shell section definition
6 Simple creation of node and element sets as well as surfaces
  • Use node and element sets and surfaces created by other features (material assignments, boundary conditions and so on)
7 CalculiX keyword editor that can fold data lines and allow changes not only right before running the analysis
  • Simple editor that can open the .inp file before running the analysis, color the syntax and save changes (accessed using the Edit .inp file button in FEM SolverControl window)
8 Meshing with hexahedral elements
  • Create the geometry in FreeCAD, export it for meshing in external software (e.g. Gmsh or Salome_Meca), import the mesh (e.g. in .inp or .unv format), drag it to the Analysis container and apply constraints to the geometry
9 Multistep analyses (e.g. preload for frequency/buckling analysis)
  • Prepare the analysis with the first step, write the .inp file, edit it to add definitions of subsequent steps and run the analysis
10 Box selection of geometric entities for constraints
  • Select geometric entities manually, one by one

Allgemeine Workarounds

Nr. Fehlende Funktion Workarounds
1 Improved appearance/rendering of 3D models
2 Status bar instructions (“Now pick this …”) for many tools that would benefit from them (e.g. Sketcher constraints), more informative tooltips
3 Consistent selection order - some tools require the user to pick the geometric entity first while others allow selection after enabling the tool
  • No known workaround
4 More GUI customization options - pie menus, different icon styles and themes and so on
  • Various customization packages created by the community
  • Link Branch
5 Advanced selection tools: selection by angle, inverting selection, selecting inside faces and so on
  • Manual selection
6 Assembly workbench with an option to constrain parts to the origin and to datums
  • No known workaround
7 Transform tool with an option to move and rotate with respect to edges and global coordinates
8 More texturing options
  • No known workaround
9 Highlight only the individual PartDesign feature in the 3D view when the corresponding operation is selected in the Tree view
  • No known workaround
10 Select only the individual PartDesign feature in the Tree view when a corresponding element is selected in the 3D view.
  • No known workaround
11 Freeform modeling
  • Model complex shapes in a "traditional" way - e.g. using add-on Curves and CurvedShapes workbenches
  • Sculpt meshes, for example in Blender, and import them into FreeCAD
12 Assembly component generators and calculators for: bolted and riveted connections, shafts, splines, keys, cams, gears (spur, bevel, worm), bearings, springs, belts and chains, pins, o-rings
13 A tool for kinematic analysis on properly constrained sketches
14 GD&T directly on 3D models - MBD approach