Datum

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Introduction

Dans FreeCAD, le mot "Datum" est normalement utilisé pour faire référence à la géométrie auxiliaire dans l'Atelier PartDesign. Ces éléments géométriques ne feront pas partie de la Shape forme finale du Body corps mais peuvent être utilisés comme références et supports pour les Esquisses et d'autres types de features fonctions.

Les éléments suivants correspondent aux éléments dérivés de la classe Part::Datum, elle-même dérivée de Part Feature:

Les éléments suivants sont dérivés directement de Part Feature:

Usage

  1. Switch to the PartDesign Workbench.
  2. Press PartDesign Body.
  3. Select the Origin of the Body, and make it visible by pressing the Space bar in your keyboard.
  4. Press PartDesign Plane to open the plane task panel.
  5. In the 3D view, click on one of the standard planes, for example, the XY plane. Then press OK to close the task panel.
  6. Now in the tree view, select the newly created DatumPlane, and then press PartDesign NewSketch.
  7. Create a closed wire, and then use PartDesign Pad to extrude the sketch, and create an initial solid.

Now you can move and rotate the DatumPlane as you wish, by changing its properties in the property editor, and the Sketch and Pad will follow its new Placement.

You can add other types of datums to be used with other sketches and features.

Notes

Since they appeared in v0.17, datum objects were intended to be used inside PartDesign Bodies. However, since they are useful "reference" objects with different attachment methods, it has been proposed that they should be available outside of the PartDesign Workbench. In this way, they will be usable in all workbenches as supporting geometry, particularly in the context of creating assemblies.