V0.18 Challenge--Clerget 9B Aero Engine--UPDATE #5

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saso
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Re: V0.18 Challenge--Clerget 9B Aero Engine--UPDATE #5

Postby saso » Sun Sep 16, 2018 3:24 pm

Great showcase, as always! :)

One function of the multi-body design that our bodies do support and I don't see you would be using are the boolean operations on the bodies. I am not saying they are better in any case and that you should be using them, but if you are exploring the capabilities of PartDesign then they are one more way to deal with more complex parts. As you can see it can be specially helpful in such cases where a lot of features are required to build a singe part, as for example in your gear case, but gets even more useful when the number of features goes even much higher. Here are two examples of this method in catia

example 1
https://www.youtube.com/watch?v=qUzLKNOM6qg
https://www.youtube.com/watch?v=Sz9AEfgEDJU

example 2
https://www.youtube.com/watch?v=UoEsQG9yQos
https://www.youtube.com/watch?v=v0aj6KeB36w
https://www.youtube.com/watch?v=9RXV8QPIixU
https://www.youtube.com/watch?v=-7crEdfMKGU
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ppemawm
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Re: V0.18 Challenge--Clerget 9B Aero Engine--UPDATE #5

Postby ppemawm » Sun Sep 16, 2018 3:54 pm

chrisb wrote:
Sun Sep 16, 2018 3:15 pm
How do you guarantee the position of the accessories? Do you have a master-master-sketch?
The short answer is no.

What I do in the accessories file is to import a .step file of the mating part(s) from the engine file in order to locate the new parts. I realize that this is not too robust because if I make changes in the engine file then I have to manually change the accessories file. So, these models are not "real" assemblies. I suppose that is why we need to be able to link files and have constraints among bodies. Some day.
saso wrote:
Sun Sep 16, 2018 3:24 pm
I don't see you would be using are the boolean operations on the bodies.
I have used that before in these instances but have not had good luck in the booleans always succeeding. But, I appreciate the reminder of that capability. The example links show that having separate bodies for the exterior and interior could make a lot of sense. I left the interior to the last and simply used the subtractive groove function for the various bores.
chrisb
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Re: V0.18 Challenge--Clerget 9B Aero Engine--UPDATE #5

Postby chrisb » Sun Sep 16, 2018 5:56 pm

ppemawm wrote:
Sun Sep 16, 2018 3:54 pm
What I do in the accessories file is to import a .step file of the mating part(s) from the engine file in order to locate the new parts.
Aah, that's a good idea to transport the geometry. Poor man's assembly.
Joel_graff
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Re: V0.18 Challenge--Clerget 9B Aero Engine--UPDATE #5

Postby Joel_graff » Mon Sep 17, 2018 2:15 pm

@ppemawn: I'm giving a presentation that will feature FreeCAD in the US at the Ohio Linux Fest in Columbus, Ohio next month. I'd like to use some shots from this thread, if you don't mind...
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ppemawm
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Re: V0.18 Challenge--Clerget 9B Aero Engine--UPDATE #5

Postby ppemawm » Mon Sep 17, 2018 8:13 pm

Joel_graff wrote:
Mon Sep 17, 2018 2:15 pm
I'm giving a presentation that will feature FreeCAD in the US at the Ohio Linux Fest in Columbus, Ohio next month. I'd like to use some shots from this thread, if you don't mind...
I do not mind. Please feel free to use any of the graphics in this post.
If there is any additional specific graphics you may want from this engine model, please let me know.