In other words, if, for example, there is a - geometrical - hole in a part to hold an axis, it's because the designer knew that there is going to be a - functional - rotation there, and not because of some lucky magic. It is interesting to note that, in fine, all assemblies are functional assemblies, but when making a geometrical assembly you somehow reverse-engineer the functions of the geometrical features that the designer of the part has implemented to match the mechanical functions of the part. We present here a way of doing an assembly - a functional assembly as opposed to a geometrical assembly - that is based on the real mechanical functions of the assembly, and not on the geometrical features of the parts in the assembly. The functional structure consists of sketches and datum objects at the root of the assembly, and placed at real functional locations, like rotation axes, planes, fixation points, translation axes. We will first create the functional structure of the assembly, and only then will we design the parts composing the assembly. Result: The document is now ready to be used by Assembly4. Save the document and call it asm_tuto2.fcstd.Note that these 3 parts are in the Parts group.Create also 3 new Parts: Assembly > Create a new Part, and call them.In that document, create a new Assembly4 Model: Assembly > Create a new Model (or ctrl+m).Create a new document: File > New (or ctrl-n).It is assumed that you have completed the 1st Assembly4 tutorial and that you have some experience with designing with FreeCAD, especially the PartDesign and Sketcher workbenches. all 3 parts and the full assembly are in 1 single FreeCAD file.the disk has a nipple that is prisoner in a slot in the arm.the arm can wiggle around the base's other axis.the disk rotates around one of the axes.In this tutorial we'll assemble 3 parts inside a single FreeCAD document, and animate the movement using a master sketch:
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