Basic TechDraw Tutorial/fr

Ce didacticiel présente au nouvel utilisateur certains des outils et techniques utilisés dans l' atelier de dessin technique TechDraw. Ce didacticiel n'est pas un guide complet de l'atelier TechDraw et de nombreux outils et fonctionnalités ne sont pas couverts. Ce didacticiel vous guidera dans les étapes nécessaires à la réalisation des dessins techniques de la pièce du Didacticiel d'introduction à l'atelier PartDesign.

Avant de commencer
Téléchargez le fichier d'exemple du didacticiel Part Design.

La tâche
Dans ce tutoriel, vous allez utiliser l'atelier TechDraw pour créer des dessins 2D de la pièce 3D ci-dessous. Nous allons créer plusieurs vues de la pièce et ajouter des dimensions clés. Ce didacticiel n'utilisera pas toutes les fonctionnalités et tous les outils disponibles dans l'atelier TechDraw, mais devrait suffire à donner à l'utilisateur de ce didacticiel les bases pour développer ses connaissances et ses compétences.

Démarrage

 * Vous souhaiterez peut-être ajuster vos préférences avant de débuter. Voir la note 1.
 * Ouvrez d'abord le fichier contenant notre pièce 3D. Ensuite, assurez-vous que vous êtes dans l'atelier TechDraw.
 * Vous allez sélectionner des éléments dans la fenêtre de dessin et / ou la vue combinée. La sélection dans TechDraw fonctionne de la même manière que dans la fenêtre 3D. Les éléments deviennent jaunes lorsque le curseur est en position pour les sélectionner et deviennent verts lorsqu'ils sont sélectionnés. Pour sélectionner plusieurs éléments, utilisez la touche Ctrl tout en cliquant.

Views and Dimensions
All work in TechDraw begins with a Page. Pages are based on Templates and contain Views.
 * 1) Click on [[Image:TechDraw_New_Default.png|32px]] New Page from default Template to create a new Page.
 * 2) Click on Body in the 3D window or in the Combo view.
 * 3) Click on [[Image:Techdraw-view.png|32px]] Create new View. This will add the View to the page we just created.

Now we have a View on the Page looking down at the top of the Body. It is a little small, though.




 * 1) Select Page in the Combo view and scroll to the Scale property on the Data tab.
 * 2) Change the Scale from 1 to 2 and press Enter.  The View will get bigger.
 * 3) Drag the View away from the documentation block in the bottom right of the page.



Better, but a little boring. Let's add some Dimensions.
 * 1) Select (LMB) the top-left Vertex (small dot), then also select (Ctl-LMB) on the bottom-left vertex.
 * 2) Click on [[Image:TechDraw_Dimension_Vertical.png|32px]] New Vertical Dimension.  Drag the dimension text away from the Body.
 * 3) Try that again with the top-left and top-right Vertices and [[Image:TechDraw_Dimension_Horizontal.png|32px]] New Horizontal Dimension.



Editable Text
We should add some documentation to our drawing.


 * 1) Click on the small green square beside Title in the documentation block.  You'll get a pop-up window where you can change Title to something more meaningful.
 * 2) Just for practice, put your name in the Designed by Name field the same way.



Getting better. Let's add some text to the page.


 * 1) Click on [[Image:Techdraw-annotation.png|32px]] New Annotation.  A text block will appear in the middle of the page.
 * 2) Drag the text block away from the main View.
 * 3) Click on Annotation in the Combo view and scroll to the Text property on the Data tab.
 * 4) Click in the data area, the click on the ellipsis at the right of the field. You'll get a pop-up window where you can change the text to something more meaningful.



Before we leave this Page, let's see what it will look like when we print it.


 * 1) Click on [[Image:TechDraw_Toggle.png|32px]] Toggle Frames.  The Vertices and View frames will disappear.  You can get them back by clicking Toggle again.



Multiple Views of a Single Part
Let's create a multiview drawing using a different Template as a starting point. We'll be using the First Angle convention, but you can change to Third Angle if that is your local convention.


 * 1) Click on [[Image:TechDraw_New_Pick.png|32px]] New Pick. A file chooser dialog will appear. Select a template file.  We're going to use "ANSIB.SVG". A new tab will appear.
 * 2) Select "Body" and "Page001" (if you have more than one page in your document, you need to tell TechDraw which one to use).
 * 3) Click on [[Image:Techdraw-projgroup.png|32px]] New Projection Group.  The familiar small view in the middle of the page will appear and a dialog will appear in the Task panel.
 * 4) Click on several boxes in the Secondary Views section of the dialog.
 * 5) Drag the View labelled "Front".  All the other Views move with it.
 * 6) Change the Scale drop down box from Page to Custom and change the Custom Scale to 2:1. Press the OK button.




 * 1) In the View labelled "TopLeftFront", select the two Vertices at the extreme ends of the front edge of the work piece.
 * 2) Click on [[Image:TechDraw_Dimension_Length.png|32px]] New Length.  Drag the dimension text away from the Body.

Linking Dimensions to 3D Model
Do you notice a problem with the dimension we just created?



From the first part of this tutorial, we know that the work piece is 53 mm wide, but our new dimensions reads 43.27. This is because "TopLeftFront" is an isometric projection, and our first drawing was an orthogonal projection. To get the right value, we need to link our dimension directly to the 3D model.


 * 1) Note the name of our faulty dimension in the Combo panel. We'll need it in a minute.
 * 2) Change to the 3D tab and select the Vertices at the ends of the front edge of the work piece. Also select Page001.
 * 3) Click on [[Image:TechDraw_Dimension_Link.png|32px]] New Links. A dialog will open in the Task panel.
 * 4) In the dialog, move our dimension from the Available column to the Selected column. Press OK.
 * 5) Return to Page001.  Our dimension should now read the correct value of 53. (if you still see 43.27, you may need to press the Recompute button or drag the dimension value a bit until it changes.)

Going Further
In this tutorial you have learning enough about TechDraw to produce a drawing like this one (by NormandC). See Note 2.



There is much more functionality in TechDraw for you to explore - Section Views, Detail Views, Svg Symbols, Images, face hatching.

Additional Resources

 * TechDraw Wiki pages
 * FreeCAD file of this exercise for comparison (made with 0.17) Download