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FreeCAD v1.0 | Twisted Part in Part Design | Basic Beginners FreeCAD Lesson 22 Exercise 8
0:00 Introduction: The tutorial focuses on creating a twisted part in FreeCAD using a multi-section loft, building upon previous lessons and focusing on smooth transitions.
0:30 Technical Drawing Analysis: The part is broken down into three sections: two identical end sections and a complex twisted middle section.
0:54 Logical Process: End sections are recognized as simple pads (extrusions). The twisted section requires a loft because the cross-sections are not identical in shape and orientation.
2:14 Operations Defined: The modeling plan includes pads for the end sections and a multi-section loft for the twisted section, all linked through shared profiles.
2:49 Start Modeling: Creating a new body and sketch on the XY plane, starting with a circular sketch.
3:46 Sketching Section One: Using a circle, arc, and polyline to create the base profile, ensuring tangency constraints. Dimensions are added for full constraint.
5:58 Padding: The sketch is padded symmetrically to plane to ensure the center of the next sketch is aligned for rotation.
6:52 Sketching the First Loft Profile: A new sketch is created on the face of the pad. External geometry is used and a rectangle that is made equal to the sides, rather than coincident, to allow for rotation without deformation.
8:15 Attachment demonstrated: The video shows how coincident geometry deforms in rotation vs using the equal constraint method.
10:48 Sketch Duplication and Offsetting: The first loft profile is carbon copied for a new sketch and offset by 2mm in the Z axis.
11:00 More Sketch Offsetting: Additional sketches are created using carbon copy, duplication, and copy/paste, all with varying angles and positions in Z. Demonstrating the benefits of carbon copy, duplication and the use of the clipboard to copy.
13:42 Understanding Copy/Paste: The video explains that the copy/paste method allows for multiple copies of a sketch while duplication does not.
14:29 Loft Creation: A multi-section additive loft is created using the face of the first pad and then the following sketches for cross-sections of the loft.
15:59 Section Three: The final section (a copy of the first) is added to the model. It is created with a carbon copy to demonstrate it's behavior, and its differences when compared to a simple duplicate copy.
16:17 Juper vs Carbon Copy: A demonstration is given showing that a "juper" or duplicated copy of a sketch allows for unconstrained changes to the sketch whereas a carbon copy is linked to the original.
17:03 Carbon Copy of non-parallel sketches: The video demonstrates how control+alt can be held down to allow a carbon copy to be created of a non-parallel sketch.
17:45 Carbon Copy Behavior: Carbon copies have linked constraints, meaning they cannot be directly modified. Changes in the original sketch also change in any carbon copies.
18:36 Positioning Final Section: The carbon copied sketch is rotated 180 degrees and positioned correctly for the end section, then padded.
19:39 Hiding Sketches and Lofts: The visibility of sketches and lofts is managed to clean up the view of the finished product.
20:06 Loft Transition Control: The tutorial shows that the transition between the pad and the loft can be controlled by adjusting the attachment offset of the loft sketches, modifying the Beast blind interpolation through the loft.
21:26 Closing Remarks: The video reiterates how to support the creator via Kofi, Paypal, and Patreon. It also thanks viewers for liking, commenting, and subscribing.