Challenge: Constant Velocity Joint (M. Gesik)

Discussion about the development of the Assembly workbench.
User avatar
Kunda1
Posts: 7988
Joined: Thu Jan 05, 2017 9:03 pm

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby Kunda1 » Mon Mar 30, 2020 4:54 pm

jpg87 wrote:
Mon Mar 30, 2020 4:40 pm
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 ?
Want to contribute back to FC? Checkout:
#lowhangingfruit | Use the Source, Luke. | How to Help FreeCAD | How to report FC bugs and features
chrisb
Posts: 27025
Joined: Tue Mar 17, 2015 9:14 am

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby chrisb » Mon Mar 30, 2020 5:41 pm

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.
User avatar
Zolko
Posts: 1000
Joined: Mon Dec 17, 2018 10:02 am

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby Zolko » Mon Mar 30, 2020 5:59 pm

jpg87 wrote:
Mon Mar 30, 2020 12:47 pm
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
try the Assembly4 workbench for FreCAD v0.19
install with Tools > Addon Manager > Assembly4 — tutorials here and here
User avatar
jpg87
Posts: 411
Joined: Thu Mar 16, 2017 7:16 am
Location: Limoges - France
Contact:

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby jpg87 » Mon Mar 30, 2020 6:41 pm

Kunda1 wrote:
Mon Mar 30, 2020 4:54 pm
but could you please speed the video up ?
It is done!

chrisb wrote:
Mon Mar 30, 2020 5:41 pm
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.

Zolko wrote:
Mon Mar 30, 2020 5:59 pm
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.
My website : http://help-freecad-jpg87.fr updated 2020/09/21
User avatar
ppemawm
Posts: 689
Joined: Fri May 17, 2013 3:54 pm
Location: Manhattan New York

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby ppemawm » Mon Mar 30, 2020 11:38 pm

Zolko wrote:
Mon Mar 30, 2020 5:59 pm
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.
jpg87 wrote:
Mon Mar 30, 2020 12:47 pm
....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.
"It is a poor workman who blames his tools..." ;)
Mark Szlazak
Posts: 424
Joined: Tue Apr 04, 2017 6:06 pm
Location: SF Bay Area, California

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby Mark Szlazak » Tue Mar 31, 2020 12:52 am

ppemawm wrote:
Mon Mar 30, 2020 11:38 pm
BTW these two models would make terrific FreeCAD splash screens provided proper attribution is given to the inventor.
My thoughts as well.
User avatar
jpg87
Posts: 411
Joined: Thu Mar 16, 2017 7:16 am
Location: Limoges - France
Contact:

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby jpg87 » Tue Mar 31, 2020 6:00 am

ppemawm wrote:
Mon Mar 30, 2020 11:38 pm
... provided proper attribution is given to the inventor.
I completely agree !
My website : http://help-freecad-jpg87.fr updated 2020/09/21
User avatar
looo
Posts: 3431
Joined: Mon Nov 11, 2013 5:29 pm

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby looo » Tue Mar 31, 2020 4:54 pm

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
Bildschirmfoto von 2020-03-31 18-47-02.png (27.57 KiB) Viewed 401 times
adrianinsaval
Posts: 344
Joined: Thu Apr 05, 2018 5:15 pm

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby adrianinsaval » Wed Apr 01, 2020 2:15 am

ppemawm wrote:
Mon Mar 30, 2020 11:38 pm
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 8-)
User avatar
jpg87
Posts: 411
Joined: Thu Mar 16, 2017 7:16 am
Location: Limoges - France
Contact:

Re: Challenge: Constant Velocity Joint (M. Gesik)

Postby jpg87 » Thu Apr 02, 2020 6:36 am

looo wrote:
Tue Mar 31, 2020 4:54 pm
it looks like it uses a different shape
Thank you looo, after various tests I reach the same conclusions :

biellettePB.png
biellettePB.png (151.82 KiB) Viewed 322 times
biellettePA.png
biellettePA.png (145.89 KiB) Viewed 322 times
My website : http://help-freecad-jpg87.fr updated 2020/09/21