Theo Jansen sandwalker
Forum rules
Be nice to others! Respect the FreeCAD code of conduct!
Be nice to others! Respect the FreeCAD code of conduct!
Theo Jansen sandwalker
Hello, may-be have-you seen these strange legged beasts that a Theo Jansen has produced and that seem walking :
well, I managed to model this (the legs at least, the most fancy part) in FreeCAD. Here an assembly of a single leg:
And here an assembly of many (many many) legs. This was done with variant links, meaning that it's the same assembly (of a single leg) that is inserted many times, with only the angle of the central handle differing, and set - using its ExpressionEngine - to the main assembly's variable, with offsets between legs. The rear legs also rotate in the opposite direction.
And of course the animation of it:
well, I managed to model this (the legs at least, the most fancy part) in FreeCAD. Here an assembly of a single leg:
And here an assembly of many (many many) legs. This was done with variant links, meaning that it's the same assembly (of a single leg) that is inserted many times, with only the angle of the central handle differing, and set - using its ExpressionEngine - to the main assembly's variable, with offsets between legs. The rear legs also rotate in the opposite direction.
And of course the animation of it:
Re: Theo Jansen sandwalker
cool stuff here, i'm a big fan of Theo Jansen!
very nice movement indeed, bravo!
very nice movement indeed, bravo!
follow my experiments on BIM modelling for architecture design
Re: Theo Jansen sandwalker
thanx. All the files are in my example repo
- FreeCutter
- Posts: 93
- Joined: Mon Aug 26, 2019 5:52 pm
- Location: Germany
- Contact:
Re: Theo Jansen sandwalker
Really cool! And very interessting example to study details in order to learn!
That's what I did and came to these questions:
How have you actually done the main assembly "asm_TheoJansen_walker"?
When I try to check one leg, e.g. "walker_leg_1" by clicking "Edit Placement of a Part" the message in the Report view is: "Please select a linked part".
I.e. how are the legs linked to the main assembly?
In addition, when trying to "Insert a Part" to this assembly there are listed Parts named "varTmpDoc#Assembly..." - where have they been generated?
I guess it's combined to my first questions, but I can't see/understand how.
Many thanks in advance for further explanations!
That's what I did and came to these questions:
How have you actually done the main assembly "asm_TheoJansen_walker"?
When I try to check one leg, e.g. "walker_leg_1" by clicking "Edit Placement of a Part" the message in the Report view is: "Please select a linked part".
I.e. how are the legs linked to the main assembly?
In addition, when trying to "Insert a Part" to this assembly there are listed Parts named "varTmpDoc#Assembly..." - where have they been generated?
I guess it's combined to my first questions, but I can't see/understand how.
Many thanks in advance for further explanations!
Re: Theo Jansen sandwalker
you need the development branch of the Assembly4 workbench (v0.10.8): download the ZIP archive, extract it, and put it (or link-it) into the FreeCAD/Mod folder, where you must have removed the installed Assembly4 directory.FreeCutter wrote: ↑Wed Sep 29, 2021 9:14 am How have you actually done the main assembly "asm_TheoJansen_walker"?
Re: Theo Jansen sandwalker
Marvelous model.
I especially appreciate the animation.
Assembly4 never ceases to amaze me of its straight forward capabilities.
"It is a poor workman who blames his tools..."
Re: Theo Jansen sandwalker
[Mind blowing icon]!
Re: Theo Jansen sandwalker
Really impressive! One question: how long took it to animate (not to built up the model to animate, i mean one cycle 360°).
Greetings
user1234
Greetings
user1234
Re: Theo Jansen sandwalker
about 10-15 minutes on a Core i5. The process seems multi-threaded and uses all available cores. I calculated in 5°steps