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.
l.
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. My guess is that if its got curved surfaces, 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.)
On Fri, Dec 5, 2014 at 3:30 PM, joem joem@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.
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?
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On Fri, Dec 5, 2014 at 4:15 PM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
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.
joe i've worked out how to do dxf import in pyopenscad, and i know already how to do dxf generation: i'll do a conversion of that case to a series of program-generated DXF files ok?
also would you be interested to help get the PCB printed and assembled? have to press forward with this.
l.
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@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?
On Mon, Dec 8, 2014 at 2:25 PM, joem joem@martindale-electric.co.uk wrote:
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@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.
no gluing required: there are 10 screws, 5 top 5 bottom, which will hold it together nicely. i think the top sheet should be 2.0mm not 1.5mm so that it sticks above the top.
Layering the sheets can generate the required thicknesses.
i realised
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).
*thinks*.... shouuuldn't bee.....
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.)
i'm a software engineer: i looked at openscad and went "this is an assembly-level set of instructions not a programming language". pyopenscad i can - and have - defined variables, re-used code, created parameterised procedures and have been able to keep the code short, flexible and to the point.
Any way I have a try to convert to dxf slices and make it.
don't worry for now: i will convert the code to output DXF files directly, then use the pyopenscad DXF import-then-extrude function to extend it to 3D. that way i can double-check it surrounds the blender-generated STL file properly.
... *deep breath*... but.... hold everything, i've never been a great fan of the 1024x600 LCD panels, and the LG one i *thought* was the only possibility... but now i realised that there's a way to use the HSD070PWW1 (which is very popular, even to the point that it's available on adafruit) by redesigning the PCB so that it is 160mm x 65mm rather than what it is at the moment.
and, as that's a 1280x800 LCD i will actually *like* it. that will encourage me to get this thing right, because i will actually want to use it myself. if you've ever tried using a 1024x600 LCD, they're crap. the KDE control panel for example doesn't even fit on-screen!
then, also, i will have [just] enough room to fit a 2nd FPC connector which will take the 10in HannStar 1280x800 LCD... which funnily enough is _also_ on adafruit. i'm currently checking the power output from the AXP209 because i reallly don't want to redesign that area, converting to use the AXP223 for example!
l.
gets me wondering if it could be possible to have the option of a pixelQi lcd... mmmh sunlight readable lcd thats low low power... but i suspect that, that is harder. it's a challenge to have a higher res lcd and a challenge to get it out there and make it. :) so i'll be grateful even if it doesn't have a pixel-qi lcd, anyway there not cheep and i guess it would be better off in a special outdoors robust tablet design, in the first place but then it has it's uses daytoday... :) arr the dilemma, i'm going to go in circles... hehe
thanks luke, nice res lcd's rum yum :D.
On Mon, Dec 8, 2014 at 4:46 PM, Alexander Stephen Thomas Ross maillist_arm-netbook@aross.me wrote:
gets me wondering if it could be possible to have the option of a pixelQi lcd
it's only 1024x600. i reaallly don't like 1024x600 LCDs. also there's heavy optical distortion which is sufficient to cause disturbing effects for your left and right eyes. i don't know if anyone else noticed from looking at an XO-1 screen, but i did.
l.
On 08/12/14 18:38, Luke Kenneth Casson Leighton wrote:
On Mon, Dec 8, 2014 at 4:46 PM, Alexander Stephen Thomas Ross maillist_arm-netbook@aross.me wrote:
gets me wondering if it could be possible to have the option of a pixelQi lcd
it's only 1024x600. i reaallly don't like 1024x600 LCDs. also there's heavy optical distortion which is sufficient to cause disturbing effects for your left and right eyes. i don't know if anyone else noticed from looking at an XO-1 screen, but i did.
l.
ooh yea, i forgot about that.
just realised, my netbook is 10inch 1024x600, haven’s noticed anything annoying personally. works nicely with gnome-shell
didn't know about eye woes with the pixel-qi lcd's.
thanks
oh yea, i guess your thinking of adding the tablet as a tear to the crowd fund maybe~? just guessing.
On Mon, Dec 8, 2014 at 4:49 PM, Alexander Stephen Thomas Ross maillist_arm-netbook@aross.me wrote:
oh yea, i guess your thinking of adding the tablet as a tear to the crowd fund maybe~? just guessing.
next project.
On Mon, 2014-12-08 at 15:45 +0000, Luke Kenneth Casson Leighton wrote:
... *deep breath*... but.... hold everything, i've never been a great fan of the 1024x600 LCD panels
hmmm... thinks odroid-vu http://www.hardkernel.com/main/products/prdt_info.php?g_code=G140383714860
Miniature HDMI monitor for $120. I bought one. If there were more of these things around with variety then lessens need for fixed screen.
On Fri, Dec 5, 2014 at 4:15 PM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
On Fri, Dec 5, 2014 at 3:30 PM, joem joem@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?
http://hands.com/~lkcl/3dcase.tgz
worked it out. there's a function "projection" - the resultant output needs to be opened in openscad then manually exported, it takes forever but i ran it the 5 times needed and produced 5 DXF files. assuming 1mm veneer:
layer 1: qty 2 needed (touchpanel surround) layer 2: qty 2 needed (lcd and pcb inset) layer 3: qty 3 needed (component surround, microsd) layer 4: qty 4 needed (component surround) layer 5: qty 1 needed (lid)
so those are 2.0mm, 2.0mm, 3.0mm, 4.0mm and 1.0mm
the files may actually contain more than one part (as there are gaps) so they may need editing. also i noticed i got the holes just above the micro-sd... also i realised i need to modify this to take into account the capacitive panel cable *sigh* but it took so damn long to run i'd be happy to modify the layer by hand.
let me know, joe, if the dxf files are good for the machine you're using.
l.
http://hands.com/~lkcl/3dcase.tgz
worked it out. there's a function "projection" - the resultant output needs to be opened in openscad then manually exported, it takes forever but i ran it the 5 times needed and produced 5 DXF files. assuming 1mm veneer:
layer 1: qty 2 needed (touchpanel surround) layer 2: qty 2 needed (lcd and pcb inset) layer 3: qty 3 needed (component surround, microsd) layer 4: qty 4 needed (component surround) layer 5: qty 1 needed (lid)
so those are 2.0mm, 2.0mm, 3.0mm, 4.0mm and 1.0mm
the files may actually contain more than one part (as there are gaps) so they may need editing. also i noticed i got the holes just above the micro-sd... also i realised i need to modify this to take into account the capacitive panel cable *sigh* but it took so damn long to run i'd be happy to modify the layer by hand.
let me know, joe, if the dxf files are good for the machine you're using.
They look OK, I give it a go - probably have to cut and glue the parts with lots of hollow insides into 2 or more pieces to avoid wasting material - or lap them etc.
arm-netbook@lists.phcomp.co.uk
-
Alexander Stephen Thomas Ross -
joem -
Luke Kenneth Casson Leighton