TutorialInfo: Topic: TechDraw Level: Beginner Time: 10 minutes Author: Andergrin FCVersion: 0.19
TechDraw Pitch Circle Tutorial
Introduction
This tutorial explains how to add a pitch circle to a 
TechDraw view. It assumes that the model is a 
PartDesign Body with at least three holes in a circular pattern. For the circle a separate sketch will be created. A similar procedure can be used in other situations and to add other annotation-like elements to TechDraw views.
In FreeCAD version 0.20 and above a pitch circle can be created with the TechDraw ExtensionHoleCircle tool.
Create the sketch for the circle
- Activate the PartDesign Body. This will also activate the
PartDesign Workbench, if required. - In the 3D view select the correct face belonging to the body.
- Create a new sketch with the
PartDesign NewSketch command. - The sketch will be attached to the selected face.
- Call the
Sketcher External command. - Select three circular edges (holes) from the body.
- Use the
Sketcher Create3PointCircle command to create a circle constrained to the center points of the external geometry. - The sketch should now be fully constrained.
- Close the sketch.
Create the TechDraw view
- Switch to the TechDraw Workbench.
- If you don\'t have one already: create a
TechDraw page. - Make sure the 3D view is properly aligned.
- Hold down the Ctrl key and in the Tree view select the body and the sketch that was just just created.
- Insert a new view by calling the
TechDraw View command. - Switch to the TechDraw page.
- Select the circle.
- Call the
TechDraw DecorateLine command. - Change the Style and Weight of the circle.
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