PartDesign Fillet

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This page is a translated version of the page PartDesign Fillet and the translation is 4% complete.
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PartDesign Fillet.svg {{{Name/es}}}

Ubicación en el Menú
Diseño de Piezas → Redondeo
Entornos de trabajo
Diseño de Piezas, Complete
Atajo de teclado por defecto
Introducido en versión
Ver también


Esta herramienta crea redondeos en las aristas seleccionadas de un objeto. Se crea una nueva entrada de Redondeo, (seguida por un número de secuencia si ya existen redondeos en el documento) en el árbol del proyecto.

This tool creates fillets (rounds) on the selected edges of an object. A new separate Fillet entry (followed by a sequential number if there are already existing fillets in the document) is created in the Project tree.

Selecciona aristas en el objeto antes de iniciar la herramienta.
Establece el radio de redondeo en los parámetros de Redondeo.
Un objeto redondeo se añade al árbol del proyecto.


  • Selecciona una o varias aristas sobre un objeto, e inicia la herramienta pulsando sobre su icono o a través del menú.
  • En los parámetros de redondeo en el panel de tareas, establece el radio introduciendo un valor o pulsando en las flechas de arriba y abajo. El redondeo aplicado se mostrará en tiempo real.
  • Pulsa OK para validar.
  • Para una cadena de aristas tangentes entre sí, se puede seleccionar una única arista; el redondeo se propagará a lo largo de la cadena.
  • Para editar el redondeo después de que la función ha sido validada, haz doble clic en la etiqueta del redondeo en el árbol del proyecto o pulsa con el botón derecho sobre ella y selecciona Editar Redondeo.

Redondeo de Diseño de Piezas VS. Redondeo de Piezas

El Redondeo de Diseño de Piezas no debe confundirse con el Redondeo de Piezas. Aunque comnparten el mismo icono, no son lo mismo, y no se utilizan del mismo modo.

Aquí puedes ver las diferencias entre ambos:

  • El Redondeo de Diseño de Piezas es paramétrico. Después de aplicar un redondeo, su radio puede editarse; esto no es posible con el Redondeo de Piezas.
  • Las aristas deben seleccionarse sobre un objeto antes de activar el redondeo de Diseño de Piezas. Con el redondeo de Piezas, la herramienta puede iniciarse y seleccionar después un sólido y las aristas.
  • El Redondeo de Diseño de Piezas crea una entrada de redondeo separada (seguida por un número de secuencia si ya existen otros redondeos) en el árbol de proyecto. El redondeo de Piezas se convierte en la raíz del objeto al que se ha aplicado.
  • El Redondeo de Diseño de Piezas ofrece una previsualización en tiempo real del redondeo a aplicar a los objetos antes de validar la función.
  • El redondeo de Pieza soporta radios variables (con un de inicio y un radio final). El Redondeo de Diseño de Piezas no.
  • Select a single or multiple edges or a face on an object, then start the tool either by clicking its icon or going into the menu. In case you selected a face all its edges are respected for filleting.
  • In Fillet parameters in the Task panel, set the fillet radius either by entering the value, or by clicking on the up/down arrows. The applied fillet is shown in real time.
  • If you want to add more edges or faces click first the Add ref button and then select the edge or the face.
  • If you want to remove edges or faces click the Remove ref button. All edges and faces being previously selected are highlighted in purple. Select the edge or the face to be removed.
  • Click OK to validate.
  • For a chain of edges tangential to one another, one single edge can be selected; the fillet will propagate along the chain.
  • To edit the fillet after the function has been validated, either double-click on the Fillet label in the Project tree, or right-click on it and select Edit Fillet.

Part Design fillet 01.png Part Design fillet 02.png

Left: select edges on the object before starting the tool. Right: set the fillet radius in the task panel.

Part Design fillet 03.png

A fillet object is added in the tree view.

PartDesign Fillet vs. Part Fillet

PartDesign Fillet.svg PartDesign Fillet is not to be confused with Part Fillet.svg Part Fillet of the Part Workbench. Although they share the same name, they are not the same, and are not used the same way.

Here is how they differ from each other:

  • The PartDesign Fillet is Parametric. After a fillet has been applied, its radius can be edited; this is not possible with the Part Fillet.
  • Edges must be selected on an object before activating the PartDesign Fillet. With the Part Fillet, the tool can be started, then a solid is selected, then edges.
  • The PartDesign Fillet creates a separate Fillet entry (followed by a sequential number if there are already existing fillets) in the Project tree. The Part Fillet becomes the parent of the object it was applied to.
  • The PartDesign Fillet offers a live preview of the fillet applied to the object before validating the function.
  • The Part Fillet supports variable radii (with a start radius and an end radius). The PartDesign fillet doesn't.

Known Issues

Fillets, chamfers, and other features that operate on solid bodies depend on the underlying OpenCASCADE Technology (OCCT) kernel that FreeCAD uses. The OCCT kernel occasionally has difficulty handling coincident sharp edges, where two faces meet. If this is the case FreeCAD may crash without an explanation.

If run from the terminal, FreeCAD may output a log like this one after the crash:

#1  0x7fff63d660ba in BRep_Tool::Curve(TopoDS_Edge const&, TopLoc_Location&, double&, double&) from /usr/lib/x86_64-linux-gnu/
#2  0x7fff63d69546 in BRep_Tool::Curve(TopoDS_Edge const&, double&, double&) from /usr/lib/x86_64-linux-gnu/
#3  0x7fff71f4fef5 in ChFi3d_Builder::PerformIntersectionAtEnd(int) from /usr/lib/x86_64-linux-gnu/
#4  0x7fff71f58307 in ChFi3d_Builder::PerformOneCorner(int, bool) from /usr/lib/x86_64-linux-gnu/
#5  0x7fff71ef6218 in ChFi3d_Builder::PerformFilletOnVertex(int) from /usr/lib/x86_64-linux-gnu/
#6  0x7fff71ef71d1 in ChFi3d_Builder::Compute() from /usr/lib/x86_64-linux-gnu/
#7  0x7fff720ad7c3 in BRepFilletAPI_MakeChamfer::Build() from /usr/lib/x86_64-linux-gnu/
#8  0x7fff723be48e in PartDesign::Chamfer::execute() from /usr/lib/freecad-daily/lib/

This output references functions located in,, etc., which are OCCT libraries. If this type of crashes occurs, the problem may need to be reported and solved in OCCT rather than in FreeCAD.

See the forum threads for more information:

The user is also responsible for the integrity of his or her own model. Depending on the model, it may be impossible to perform a fillet or chamfer if the body is not big enough to support that operation. For example, it wouldn't be possible to create a 10 mm fillet if an edge is separated only 5 mm from the next surface. In that case, the maximum radius for a fillet would be 5 mm; trying to use a larger value may result in a shape that doesn't compute, or even a crash. If using the exact limit of 5 mm doesn't work, it may be possible to use a very close approximation, like 4.9999 mm, to produce the same visible result.

Topological naming

Edge numbers are not completely stable, therefore it is advisable that you finish the main design work of your solid body before applying features like fillets and chamfers, otherwise edges could change name and filleted edges would likely become invalid.

Read more in topological naming problem.


The tool text-top=Fillet Fillet can be used in a macro, and, from the Python console using the following function :

Box = Box.makeFillet(3,[Box.Edges[0]]) # 1 Fillet
Box = Box.makeFillet(3,[Box.Edges[1],Box.Edges[2],Box.Edges[3],Box.Edges[4]]) # for several Fillets
  • 3 = radius
  • Box.Edges[2] = Edge with its number

Example :

import PartDesign
from FreeCAD import Base

Box = Part.makeBox(10,10,10)
Box = Box.makeFillet(3,[Box.Edges[0]]) # pour 1 Fillet
Box = Box.makeFillet(3,[Box.Edges[1],Box.Edges[2],Box.Edges[3],Box.Edges[4]]) # for several Fillets