Lofting Sketches that contain hole.
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Re: Lofting Sketches that contain hole.
kurt2me uses Part workbench, and there he would need two lofts. However, these examples are pretty convincing to give PartDesign a try.
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Re: Lofting Sketches that contain hole.
Version .17, part workbenchkisolre wrote: ↑Tue Apr 23, 2019 11:36 am I was citing the wiki... which was not entirely correct... probably more indepht explanation is needed there. Any way it looks like it works so more info is needed to answer.
Could you provide an example file, your freecad version info,... as Chrisb mentioned above?
Here is an example of working PartDesign Loft:
- Attachments
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- sample.png (28.28 KiB) Viewed 660 times
Re: Lofting Sketches that contain hole.
This looks great. Not sure I can duplicate. I'm new to this. Thanks. At least I know it can be done.meme2704 wrote: ↑Tue Apr 23, 2019 5:45 pm The outer form and the loft central hole provided not to exaggerate with the Bspline.
It's worth remembering that you need as many segments up and down
If we add the two lateral holes, they cross at the center
The solution is to make 1 subtractiv loft and a miror
Re: Lofting Sketches that contain hole.
See attached file.
- Attachments
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- Test.FCStd
- (207.41 KiB) Downloaded 20 times
Re: Lofting Sketches that contain hole.
Sorry, Mistake. you should see the attachment on that same post.
Re: Lofting Sketches that contain hole.
That is not the way to trace that. Why did you not use arcs? Also lofting between that sketches by some reason crosses the side openings. Probably because the order in which they were created. You should probably trace them in the same order - first outer contour, then left opening, then central one, then the right one. In both sketches. Also when creating the sketches first move them to the center of the respective drawing, trace, return to 0,0.
I will try some simple tracing as example...
When importing the ImagePlane link its sizes with expressions so it will be alwais proportional- YSize=XSize*ImageHeight/ImageWidth (default sizes are rounded and not exactly proportional). Move it to Z=-1 so it will not obscure your sketches. Then create a simple paralelogram with 2 known dimensions, scale/move the imagePlane to fit that paralelogram, zero the position of the imagePlane and then trace the sketches.
Also while tracing the profiles constraint them after finishing every contour.
Here is a start (man this is hard ) :
I will try some simple tracing as example...
When importing the ImagePlane link its sizes with expressions so it will be alwais proportional- YSize=XSize*ImageHeight/ImageWidth (default sizes are rounded and not exactly proportional). Move it to Z=-1 so it will not obscure your sketches. Then create a simple paralelogram with 2 known dimensions, scale/move the imagePlane to fit that paralelogram, zero the position of the imagePlane and then trace the sketches.
Also while tracing the profiles constraint them after finishing every contour.
Here is a start (man this is hard ) :
- Attachments
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- Test_kiss.FCStd
- (164.46 KiB) Downloaded 19 times
Last edited by kisolre on Tue Apr 23, 2019 7:20 pm, edited 1 time in total.
Re: Lofting Sketches that contain hole.
Thanks for the help. Newbie.kisolre wrote: ↑Tue Apr 23, 2019 6:40 pm That is not the way to trace that. Why did you not use arcs? Also lofting between that sketches by some reason crosses the side openings. Probably because the order in which they were created. You should probably trace them in the same order - first outer contour, then left opening, then central one, then the right one. In both sketches. Also when creating the sketches first move them to the center of the respective drawing, trace, return to 0,0.
I will try some simple tracing as example...
When importing the ImagePlane link its sizes with expressions so it will be alwais proportional- YSize=XSize*ImageHeight/ImageWidth (default sizes are rounded and not exactly proportional). Move it to Z=-1 so it will not obscure your sketches. Then create a simple paralelogram with 2 known dimensions, scale/move the imagePlane to fit that paralelogram, zero the position of the imagePlane and then trace the sketches.
Also while tracing the profiles constraint them after finishing every contour.