Assembly Challenge: hypnotic geometric thing

[Kunda1]

phpBB [video]

Anyone interested in testing the different assembly workbenches to model this hypnotic thing?

[DeepSOIC]

Sketcher counts?

[chrisb]

I would have bet that it works only of the diameters of both circles have a certain ratio, my guess was 1:2. Your sketch proves that it is arbitrary within certain limits.

[cox]

I wonder if it is possible to drive more than one small wheels without them crashing in center?

[chrisb]

Open Sketcher and run the code in python console. Outside sketcher additional recompute is needed.

Code: Select all

import time
from PySide import QtCore

# call from console: execfile('/Users/cb/panhard/coupe/sanssoupapes/hypno.py')

step = 1.0
timeout = 0.001
angle = 720

def update():
  global angle
  angle -= step
  App.ActiveDocument.Sketch.setDatum(37,App.Units.Quantity(str(angle)+' deg'))

while angle > 0:
  update()
  App.ActiveDocument.recompute()
  time.sleep(timeout)

[kbwbe]

Hi Guy's,

and now without sketcher but with A2plus...

Here is a video:
https://youtu.be/nUQezfutJYs

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hypnoticon.png (109.65 KiB) Viewed 3613 times

.

A2plus has to be installed
1) Copy the attached script to your macro folder
2) Open the attached fcstd file
3) Start the macro

To speed it up i used modified solver accuracy...
With standard options the simulation will be slower.

Code: Select all

SOLVER_CONTROLDATA = {
    #Index:(posAccuracy,spinAccuracy,completeSolvingRequired)
    1:(0.1,0.1,True)
    }

Edit:
There was an error in the attached simulation script. It was only able to run on my local installation, but not on a standard installation. I replaced the attached script by a correct one. Sorry !
Also i simplified the script.

[roerich_64]

@ Klaus: 1+

[kbwbe]

The simulation script of my previous post needed to be fixed.
Please find attached the correct files.

[Kunda1]

Wow, what a great response + learning more about FreeCAD in the process!
Thanks to all that participated.

[Zolko]

Sketcher counts?

Code: Select all

kunda1-thingy-sketcher.FCStd

And here is the assembly using your sketch as base (with Asm4):

hypnotic_0.98Mb.gif (1006.36 KiB) Viewed 3406 times