Hull develope

[maksic]

Does anyone know some good software or some easy way for develope hull surface made in Rhino. Rhino have option for develope surface which is developable but I want do it whit more complicated surface.

[CGN]

Download a demo of Expander

http://www.shipconstructor.com/expander.html

[Stephen Ditmore]

TouchCAD is great for unwrapping plate, but I don't know how it is for assuring the shape is developable if you want to avoid compound curvature.

[Raggi_Thor]

Expander is useful, but how are you going to build it?
Are you building in aluminium?
More complicated surfaces = compound curvature?
Those can not be made without "float" in teh material, possible with steel and alu, impossible with plywood.

[maksic]

I want to made boat in steel, but in any case I want to know how I can make developable surface.
I will take I Expander and try to use them.

[jam007]

You might try FREE!Ship (freeship.org). It handles developable surfaces and can print them.

Anders M

[Raggi_Thor]

Rhino also handles developable surfaces. Expander handles also compund surfaces, that are not developable. You get some indications to know (by experience) if the surface still is "buildable" with the pathces you have made. It takes professional tools to make a compound steel hull, I think. The forces to are quite large if the hull plating is not extremely thin.

[maksic]

I try to install Expander and durin instalation I had some complications. I was download demo version and when I try to instal in Rhino it request some code. I must send email to Shipconstructor and so on.

What is easiest way for install Expander?

[Raggi_Thor]

Contact DS&T, the european dealer.

[fede]

It would be interesting to see a program that splits non developable surfaces into developable or "close to" developable chunks.
Does this make sense????

[CGN]

Maybe ludesign can let us know if is possible to do what Fede is asking, I believe Touchcad has many ways to show the development of a surface.

[Raggi_Thor]

I discussed this with Mr Lundgren for the bottom of our B18. He did split the bottom into chuncks or pathches that probably could be forces into shape if we used two layers of 4mm playwood. We ended up using 8x23mm strips insted as this was faster (we had the strips allready).

[ludesign]

Originally Posted by fede

It would be interesting to see a program that splits non developable surfaces into developable or "close to" developable chunks.
Does this make sense????

TouchCAD comes with a massive set of such feature settings, all parametric.

The image shows some examples based on the same hull, and where all changes where made in seconds using the Object Info palette. The Windows version has the same features.

From the top:

> A sixteen strip split along the hull direction.

> An eight strip split along the hull direction.

> A sixteen strip split perpendicular to the hull, and where the strips have been joined into compound strips on groups four strips per group. When the stretch unfold features are used, you can analyze there the tensions occur, and it even comes with a set of features to balance the tensions, for example if there are more tension on one side and less on the other. It can of course also compile the panel into a single piece, though in this case it would not make much sense. As always with such calculations, they should be used with moderation and common sense.

> An eight strip split along the hull direction, and where seam allowances/ overlaps where added. These overlaps are individual for each panel and panel side.

> An 80 square meter / 40 panel spinnaker, on which where a high resolution image was applied at 12 DPI in full scale. The resulting unfolded image, being 1.3 x 61 meters, took 2-1/2 minutes for TouchCAD to render. The result of course matches the vector-based unfolded patterns.

All TouchCAD surfaces has it's own set of unfolding properties, and they are dynamically linked to the 3D model. You can for example easily generate a 500 NURBS surface model, and unfold and nest these panels by dragging and rotating them in the Unfold view to optimize the use of material and generate a ready to cut layout, without loosing the dynamic link to the 3D model. You can even modify the 3D shape directly from the Unfold view, and instantly see the result.

If you need even more flexibility, it is also very easy to use one or many surfaces as a "mould", to which you can apply any number of patches in any direction, shape, and size, and in many layers, such as in plywood or layers of reinforcement materials.

[Raggi_Thor]

Claes, I am extremely sorry that I called you Lundgren insted of Lundström!

[jam007]

fede: "It would be interesting to see a program that splits non developable surfaces into developable or "close to" developable chunks.
Does this make sense???? "

Not a program but...
Thre is an example of this manually with FREE!Ship here:
http://sourceforge.net/forum/forum.p...orum_id=501883

Anders M