[Arm-netbook] http://rhombus-tech.net/community_ideas/kde_tablet/news/

[joem]

On Fri, 2014-12-05 at 16:15 +0000, Luke Kenneth Casson Leighton wrote:
> On Fri, Dec 5, 2014 at 3:30 PM, joem <joem at martindale-electric.co.uk> wrote:
> > On Thu, 2014-12-04 at 23:45 +0000, Luke Kenneth Casson Leighton wrote:
> >> started on a first revision of the tablet casework, as a pyopenscad
> >> program, using a blender-exported STL as the "ghost" template to work
> >> out how the case should surround the parts.  it's done as layers so
> >> may either be made of wooden laminates or 3D printed and assembled
> >> using screws/bolts.
> >
> > I got limited wood veneer about 1mm thick to make own laminate cut with
> > laser. Let me know where to download the dxf file (or whatever), to try
> > make something.
> 
>  http://hands.com/~lkcl/3dcase.tgz - do you know how to take dxf
> slices from openscad?  if not i'll rework the python code to generate
> dxf files directly.  don't be confused by the name car_model.py ok? :)
>  pyopenscad.py is included in the directory so will be imported
> directly.
> 
> > My guess is that if its got curved surfaces,
> 
>  no, and that's deliberate.  i arranged it so it's possible to laser-cut.
> 
>  ok so only 1mm veneer, hmmm, you can get away with that.  thicknesses
> are meant to be 1.5mm, 3.0mm, 4.0mm and 2.5mm however you could get
> away with either one or two 1mm, then 3mm, 4mm and 2mm (just about).
> base could be 1mm as well.  the1.5mm is a surround for the
> touchscreen.

Not really a problem - after gluing,
sand the surface to requirements.

Layering the sheets can generate the required thicknesses.
I got limited thin ply and plenty 4.3mm ply that can
be laser cut. (Usually only birch plywood cuts well with
laser.) I got thin sheets of mylar (easy to cut with laser)
that can be used to increase electrical isolation (in case
the veneer is permeable to moisture around critical parts).

It should be easy to slice 3D model into dxf files.

(My personal thoughts are that it would be easier to do this
project scripted in openscad instead of openscad.py
only about 10 or 20 commands to learn.)

Any way I have a try to convert to dxf slices and make it.



> > a wooden
> > mold would also have to be made from laminates to allow the laminates to
> > be clamped and set into their final shape.
> > (Veneer is dirt cheap but container shipment costs about double the
> > value of the contents inside.)
> 
>  bizarre huh?