Challenge: Constant Velocity Joint (M. Gesik)

[Kunda1]

I remade the video by simultaneously varying the angle between the entry and the exit from 25 ° to 41.8 °: we then see that the arms with toothed sector collide (see more?).

Sorry, don't mean to nit-pick, but could you please speed the video up ?

[chrisb]

Thanks, very good! I would second Kund's proposal. You could show two or even 5 revolutions over the vide's time. The slowdown functionplus pause then would enable the viewer still to see the details.

[Zolko]

this weekend I couldn't resist the urge to try this mechanism with Asm3 WB. Here's what I get. Animation video:

http://help-freecad-jpg87.fr/02assembla ... layer.html

Nice, well done. Did you use the provided STL files or did you re-model the parts ? It seems that the teeth are interfering with each other, no ?

Here are videos of my assembly (only 1 arm, the 2 others would be similar)

http://downloads.zzaero.com/CVJoint_deflection.mp4
http://downloads.zzaero.com/CVJoint_rotation.mp4

[jpg87]

but could you please speed the video up ?

It is done!

You could show two or even 5 revolutions over the vide's time. The slowdown functionplus pause then would enable the viewer still to see the details.

I will try to improve and do several laps.

Did you use the provided STL files or did you re-model the parts ? It seems that the teeth are interfering with each other, no ?

I used the stl files as wallpaper and redrawn the parts in PartDesign WB.
For this, I created provisional assemblies in Asm3 WB to position the stl previously solidified in Part WB.
For the teeth, I used FCGear, but I had trouble adjusting it correctly with the original teeth.

Your videos show how it works. Well done.
Sorry, I have not yet tried your Asm4 workshop: I work rather from contacts between surfaces, which I find more "concrete", and that allows Asm3 at two levels of complexity.

[ppemawm]

Here are videos of my assembly (only 1 arm, the 2 others would be similar)

Thank you for the videos. An exact solution!
I am so jealous that I have not finished mine yet.

....this weekend I couldn't resist the urge to try this mechanism with Asm3 WB.

Thank you, too, for demonstrating the CV joint using ASM3. I appreciate how much effort it is to create the model.
I look forward to investigating ASM3 once it becomes a standard workbench accessible with the AddOn manager.

BTW these two models would make terrific FreeCAD splash screens provided proper attribution is given to the inventor.

[Mark Szlazak]

BTW these two models would make terrific FreeCAD splash screens provided proper attribution is given to the inventor.

My thoughts as well.

[jpg87]

... provided proper attribution is given to the inventor.

I completely agree !

[looo]

I tried to reconstruct the bevel-gear but it looks like it uses a different shape (not spherical-involute). Anyway, the pitch angle should be exactly 18° and the center should be at the center of the sphere. With 13 teeth it looks like a good approximation.

Bildschirmfoto von 2020-03-31 18-47-02.png (27.57 KiB) Viewed 597 times

[adrianinsaval]

BTW these two models would make terrific FreeCAD splash screens provided proper attribution is given to the inventor.

Now imagine them animated as splash screen, it would be a totally unnecesary use of resources but you have to admit it would look cool

[jpg87]

it looks like it uses a different shape

Thank you looo, after various tests I reach the same conclusions :

biellettePB.png (151.82 KiB) Viewed 518 times

biellettePA.png (145.89 KiB) Viewed 518 times