[Arm-netbook] microdesktop casework as DXF files for laser-cutting

[Normand Chamberland]

Hello,

Thanks Mark. Just to give some context to these files:

- This is a first draft. Even though Luke wrote he'd take care of it, I had
already started the process with Mark last week. I didn't spend more than a
couple of hours on this last night and I didn't calculate precise
clearances, the PCB as per Luke's STL model will fit but there may be too
much or not enough clearance along X and Y axes (X and Y being parallel to
the ground).
- It requires 8 layers of 3mm wood panels, overall dimensions of casing
(without screws) being 111mm wide by 115mm deep by 24mm high. Consequently
the PCB is near flush to the front and rear of the casing.
- For 3 layers, the panels are separated into a left side and a right side.
4th and 5th layer (from bottom) are identical.
- If it was judged acceptable for the card reader to be exposed underneath
the casing, the bottom layer could be removed to reduce the total number of
layers to 7.
- The PCB board sits on the 2nd layer, not having seen any picture of this
board I don't now if components protrude underneath it (I know nothing
about electronics). It may not be viable to have it sit on a flat surface
that way.
- There are 11 lasercut wood pieces. That's a lot. Is the layered design
definitive (I guess that's what the backers will expect since that's what's
shown on Crowd Supply), or could this be discarded in favour of a new
design optimizing fabrication? A more classic box with dovetail joints may
be less expensive, and allow more control on the fitting of the board.
Something akin to
https://images-na.ssl-images-amazon.com/images/I/91H9TOVowCL._SL1500_.jpg
(but hopefully with better looks!)

Luke, I know you prefer working with OpenSCAD, I was able to export my
FreeCAD file to .csg which is a format recognized by OpenSCAD, but the
generated text file is over 1MB and contains a series of multmatrix and
polyhedrons with an unmanageable number of coordinates. Let me know if you
want to have a look at it anyway.

Cheers,

Normand

2017-03-29 18:34 GMT-04:00 Mark Van den Borre <mark at lusis.eu>:

> Hello Luke, list,
>
> This is work by Normand, FreeCAD expert and kickstarter backer:
>
> http://glasno.st/microdesktop_model2_normandc3.fcstd
> http://glasno.st/microdesktop_layers_v1.dxf
>
> Kind regards,
>
> Mark
>
> 2017-03-28 9:58 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:
>
>> hiya mark (and list),
>>
>> i started taking a look at creating case layers for the microdesktop,
>> and it's not as straightforward as it seems: creating a stack that
>> will ensure that the PCB doesn't drop out at one end is not as simple
>> as it first seems.  so i'll take care of it.
>>
>> l.
>>
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>
>
>
> --
> --
> http://lusis.eu
> full service b2b laser cutting
>
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