Hi Nicolas,

> See attached files.

Yeah it's just the problem I mentioned above, your reverse helix does not have the helix/cylinder axis positioned at the 0,0,0 world origin.

In order to simplify the script it assumes that the helix axis is on the world x axis line. That doesn't mean just in the same direction as the x axis, it means directly on the world axis line.

I've attached an update of your file where I've moved the "Not working" one so its axis starts at the 0,0,0 world origin point, does it work ok for you now? I guess it may need a negative rotation angle as well (which I see Brian notes above too).

- Michael

Thank.
Script work fine in your 3dm file.
I must just think to launch the script with helix/cylinder axis positioned at the 0,0,0 world origin.
Very simply ;-)
Best regards.
Nicolas.

Hi,
Result
Barry

Hey Barry,
Here's my cheesy version. I wanted to setup a simulation, which should provide collision checking etc....But:



My opposing screw is still malformed for one. lol

But I also wanted to ask if you can share your process a bit deeper. Mostly with regard to the station count on your helical length, and also if you are using a slug "other" than the bottle (the one to be moved) to do the Booleans...

Your "bite curves" are beautiful and will help in the smooth surface creation. I HAVE gotten better results with higher counts, but still get SOME bad bites. Is there any magic you can share in this regard?

Thanks again. Fun project!

Hi Burr,
my shaft is 4 long x 1 diameter and the helix 4 coils. I used an ellipse 0.3 x 0.5 blank to produce the facets at 50 per coil.
The bottle rotation was 90 degrees over the length of the helix. In addition I added a run in and run out. This was done
by adding a single coil on each end with no rotation thus giving blanks to Boolean of one coil entry no rotation, four coils (Shaft)
90 degrees rotation, one coil exit no rotation.
For the opposite hand helix shaft I rotated the blank 180 degrees to move the seam thinking this will give a continuous facet
edge for lofting.
Hope this helps
Barry.
Ps how did you do your animation?

Hi BurrMan,
In your animation (Inventor?), your opposite screw seems one "mirror"?
My first tests with collision produce very surprising results. ("Flying bottle")
You need to pay a lot of attention when creating the screws and the intersect object.
My work does not leave me very little time to work on it "bottle feed screw" but really an interesting topic.
Thank all for that.

Hi Barry,
For provide one simulation with collision in real time, it's possible to use Simlab Mechanical (21day free trial).
The results are of good quality;
http://www.simlab-soft.com/3d-products/simlab-composer-mechanical.aspx
Best regards.
Nicolas.

Hi Barry,
Thanks for the breakdown. That will help me alot!
The animation is simlab. They have a simulation workbench, but i wont move there until i get the setup correct.

@nico

"My screw is malformed".... Yes!

Hey Nico,
""""My first test produces a flying bottle"""""

Have you made you plug a little bigger than your bottle?

I dont think 2 objects the same size would work in a proper sim environment...

Hi,
this is the result of lofting the facet edges to produce the scrolls.I reduced number of facets to 40 per coil
and made sure the seams of the bottle and the Can where not part of the subtraction as this ends up with
the facet edges in sections.
Thanks to Brian for the help with the node editor I've got it working with the quartz node so now I can run
the animation automatically without moving a slider.
Cheers
Barry