There is also a detailed explanation (in the context of FreeCAD) of Constructive_solid_geometry on the wiki. The first (and basic) technique of solid modeling is Constructive Solid Geometry (CSG). Save your work often, from time to time save your work under a different name, so you have a "safe" copy to fall back to, and be prepared to the possibility that some commands might not give you the expected results. Don't hesitate to allow 2 or 3 backup files until you know well how to deal with FreeCAD. The number of those backup files can be specified in the preferences dialog. FreeCAD now has the ability to save backup files. Keep in mind that FreeCAD is still in an early stage of development, so you might not be as productive as with another CAD application, and you will certainly encounter bugs, or experience crashes.
This tutorial was written with version 0.15 of FreeCAD.
One thing to know is that FreeCAD is modular by design, and like for many other CAD software, there are always more than one way to do things. This Basic Modeling Tutorial will show you how to model an iron angle. 4 1st Method - By Constructive Solid Geometry.
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