Modeling Challenge - Trasmission between 3 shafts

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Kunda1
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Modeling Challenge - Trasmission between 3 shafts

Post by Kunda1 »

Any modelers want to take a stab at this beast?

phpBB [video]

phpBB [video]

phpBB [video]


ref: https://grabcad.com/library/transmissio ... ois-axes-1
(note the STEP files exist on grabcad, but the challenge is to build it from scratch in FreeCAD.

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Zolko
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Re: Modeling Challenge - Trasmission between 3 shafts

Post by Zolko »

Kunda1 wrote: Wed Aug 17, 2022 1:39 pm Any modelers want to take a stab at this beast?
THAT liaison doesn't work in real life : nothing is guiding that rod for a pure translation.

3axes.png
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mfro
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Re: Modeling Challenge - Trasmission between 3 shafts

Post by mfro »

Zolko wrote: Thu Aug 18, 2022 7:47 am THAT liaison doesn't work in real life : nothing is guiding that rod for a pure translation.
I guess it is when fully assembled. There is a "cardanic bushing" missing in that exploded view that is visible in the other videos.
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Markus
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Zolko
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Re: Modeling Challenge - Trasmission between 3 shafts

Post by Zolko »

mfro wrote: Thu Aug 18, 2022 9:56 am
Zolko wrote: Thu Aug 18, 2022 7:47 am THAT liaison doesn't work in real life : nothing is guiding that rod for a pure translation.
There is a "cardanic bushing" missing in that exploded view that is visible in the other videos.
hum, yes, you're probably right. I still doubt that you can convey much torque/force on such limited guiding
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mfro
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Re: Modeling Challenge - Trasmission between 3 shafts

Post by mfro »

Zolko wrote: Thu Aug 18, 2022 10:59 am hum, yes, you're probably right. I still doubt that you can convey much torque/force on such limited guiding
I'd agree. That massive outer joints visually promise a rigidity the inner components likely can't keep.
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obelisk79
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Re: Modeling Challenge - Trasmission between 3 shafts

Post by obelisk79 »

So, I've managed to model my take on the transmission, and I'm pretty sure the geometry itself is correct, but I've been unable to create a dynamic assembly with constraints in A2+ to generate an animation. I'll share screenshots and my FCStd file to the firing squad here shortly.
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obelisk79
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Re: Modeling Challenge - Trasmission between 3 shafts

Post by obelisk79 »

Constructive criticism on my modeling is welcome. Anyone who wants to make it work in A2Plus, please share. This was my first serious attempt at using it and I kept running into problems.
2022-08-18_09-56.png
2022-08-18_09-56.png (86.16 KiB) Viewed 1636 times
2022-08-18_09-56_1.png
2022-08-18_09-56_1.png (90.79 KiB) Viewed 1636 times
2022-08-18_09-56_2.png
2022-08-18_09-56_2.png (95.25 KiB) Viewed 1636 times
2022-08-18_09-57.png
2022-08-18_09-57.png (144.99 KiB) Viewed 1636 times
Attachments
Tri-Shaft.FCStd
(989.03 KiB) Downloaded 33 times
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jimmihenry
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Re: Modeling Challenge - Trasmission between 3 shafts

Post by jimmihenry »

Well the first try, avoiding fillet failed. The second attempt applying fillets failed. Applying all fillets at once did go half way thru. However there are some bugs... but i need different fillet's! Yellow is the original, grey is the remade solid... (kind of). And "refine" went big time tits up :oops: !

Cheers.

Code: Select all

OS: Windows 7 Version 6.1 (Build 7601: SP 1)
Word size of FreeCAD: 64-bit
Version: 0.21.30121 (Git)
Build type: Release
Branch: master
Hash: 9c929897ac46f2309e2bf34b7106f49fcb737a1d
Python 3.8.13, Qt 5.15.4, Coin 4.0.0, Vtk 9.1.0, OCC 7.6.2
Locale: German/Germany (de_DE)
Installed mods: 
  * ArchTextures
  * Behave-Dark-Colors 0.1.1
  * CurvedShapes 0.2.56
  * Curves 0.5.5
  * Defeaturing
  * dodo
  * ExplodedAssembly
  * fasteners 0.3.38
  * fcgear 1.0.0
  * Geomatics
  * Graphviz
  * InventorLoader 1.3.0
  * kicadStepUpMod 10.14.5
  * lattice2 1.0.0
  * Manipulator 1.4.9
  * Plot 2022.4.17
  * ProDarkThemePreferencePack 1.0.0
  * Pyramids-and-Polyhedrons
  * Ship 2022.4.11
Attachments
Not so well well well 4.png
Not so well well well 4.png (569.89 KiB) Viewed 1581 times
Last edited by jimmihenry on Sat Aug 20, 2022 2:29 am, edited 1 time in total.
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jimmihenry
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Re: Modeling Challenge - Trasmission between 3 shafts

Post by jimmihenry »

Okay, now we are rolling in the right direction. For all who recognize the connecting boss, the part in the middle, did not match the requirement. I had a idea what the shape looked like and i had a idea what feature would do the trick. The radius on all the edges didn't make the reconstruction easier but the solution was stupidly simple! After all i have put the shape binder to good use. Basically it is mostly the shape binder feature and a few sketches. I did not manage to apply the fillet, the upper fillet is 2mm the lower fillet is 0,8mm these two are possible but buggy i guess. The connecting boss has some fillets around 5,6mm if i remember correctly. Could do those manually but there is no point doing that... The feature should just work.

I've cleaned the file and mixed up the order of the file tree in the process, but this shouldn't be a problem. I cut the "bounded shape" in half and linked external geometry into the sketches, easy. I did like the shape binder the first time i used it, it's NOICE :mrgreen: .

Here is the file for download. The rest of the assembly shouldn't be a problem for FreeCAD...

If you like, you can visit my GrabCAD. I have some models there, you can take a look in the 3D viewer at them.
https://grabcad.com/jimmi.henry-1/models
Attachments
TCRD90 Remake.FCStd
(669.4 KiB) Downloaded 22 times
Lever Recreation.png
Lever Recreation.png (389.37 KiB) Viewed 1471 times
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jimmihenry
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Re: Modeling Challenge - Trasmission between 3 shafts

Post by jimmihenry »

Here is the progress i made recreating the models...

You see a screenshot of my Windows7 thumbnails in the image below. Even lower a part of the housing. This model does not allow to apply fillets it will be provided for download. Butt only the lite version without the shape binder model, where sketches were processed with the "Sketch validation" tool and "Delete constraints to external geometry" was executed. Otherwise the part would exceed the size of 10MB.

Just look how nice the gradient looks in the thumbnails :). Yes the logo is from another program, it was jealous how nice the thumbnails looked so it hijacked them... Windows!
Attachments
TCRD90 Remake IX lite.FCStd
(949.18 KiB) Downloaded 17 times
TCRD90 Part Collection.png
TCRD90 Part Collection.png (391.16 KiB) Viewed 1275 times
Ribbed Case.png
Ribbed Case.png (388.33 KiB) Viewed 1275 times
Last edited by jimmihenry on Wed Sep 07, 2022 9:41 pm, edited 1 time in total.
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