SketchyPhysics - How to make a strong Winch Cable ?

kraftwerk

Hello

I'm trying to build a winch cable. With the SU 8 and SP 3.2 (or is 3.1?)

After searching http://sketchucation.com/forums/viewtopic.php?f=61&t=24741 (thanks to hpnisse !) and more, I put a motor pulley and a upper pulley.

cable winch.jpeg

And i'm using the script above to make rope / cable:

ontouch{|t,s,p|
connect(t,"ball") if frame==0
}

Works fine if the Density of big sphere keeped in 0.2 g/cm3.

But the rope / cable is broken when the Density is changed to the steel density of 7.5 g/cm3
The same happens if I draw an object of greater volume in replacing the large sphere.

So, in this momment, I can't to simulate a real winch or elevator.

How can I feed sketchyphysics with data type as shear load, maximum load traction ...?
What can I do avoid a broken rope / cable?

kraftwerk

this is the file:

Doubt - Winch Cable.skp