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mechanical dimensions

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  mechanical dimensions Stefan Krister <stefan.krister@creative.chaos.de> - 2015-06-22 15:43 +0200
    Re: mechanical dimensions Tomasz Torcz <zdzichu@irc.-spamu.nie.chce-.pl> - 2015-06-22 17:08 +0000
      Re: mechanical dimensions Stefan Krister <stefan.krister@creative.chaos.de> - 2015-06-24 08:56 +0200
    Re: mechanical dimensions rickman <gnuarm@gmail.com> - 2015-06-22 21:37 -0400
      Re: mechanical dimensions Andy Burns <usenet.feb2014@adslpipe.co.uk> - 2015-06-23 07:22 +0100
    Re: mechanical dimensions Stefan Krister <stefan.krister@creative.chaos.de> - 2015-06-24 08:55 +0200
    Re: mechanical dimensions Stefan Krister <stefan.krister@creative.chaos.de> - 2015-06-24 08:59 +0200
      Re: mechanical dimensions Theo Markettos <theom+news@chiark.greenend.org.uk> - 2015-06-24 18:18 +0100
        Re: mechanical dimensions Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-24 22:33 +0000
    Re: mechanical dimensions rickman <gnuarm@gmail.com> - 2015-06-24 18:07 -0400

#8950 — mechanical dimensions

Hi,

I'm developing a 19" rack mount "case" in OpenSCAD for the Raspberry Pi
2 Model B. I would like to have the mechanical dimensions to put the
holes and cutouts at the right places. The only thing I found are
measurements from the top but not from the side or front/back.

Bye

Stefan

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#8958

 Dzieki, Dom, za post o tresci: 
> On 22/06/15 16:59, Tomasz Torcz wrote:
>>   Dzieki, Stefan, za post o tresci:
>>> Hi,
>>>
>>> I'm developing a 19" rack mount "case" in OpenSCAD for the Raspberry Pi
>>> 2 Model B. I would like to have the mechanical dimensions to put the
>>> holes and cutouts at the right places. The only thing I found are
>>> measurements from the top but not from the side or front/back.
>>
>>   Does this help?
>>
>> Two 2.5mm (drilled 2.9mm for M2.5 screw) non plated mounting holes have been
>> provided to assist with ATE test mounting. Positions of these holes relative to
>> the bottom left of the PCB (Power Input Corner) are:
>>
>> Corner: 0.0mm,0.0mm
>> First Mount: 25.5mm,18.0mm
>> Second Mount: 80.1mm, 43.6mm
>>
> Possibly... if that wasn't the spec for the old B model, not the 2B 
> which was the model asked about.

  Sorry, it is easy to get lost between so many models.

> The 2B has the same dimensions as the B+, with four proper mounting 
> holes. Unfortunately I don't have the dimensions, but you could always 
> measure one.

  So this should be relevant:
https://www.raspberrypi.org/documentation/hardware/raspberrypi/mechanical/Raspberry-Pi-B-Plus-V1.2-Mechanical-Drawing.pdf
https://www.raspberrypi.org/documentation/hardware/raspberrypi/mechanical/Raspberry-Pi-B-Plus-V1.2-Mechanical.dxf



-- 
Tomasz Torcz       ,,(...) today's high-end is tomorrow's embedded processor.''
xmpp: zdzichubg@chrome.pl                      -- Mitchell Blank on LKML

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#8977

Hi Tomasz,

Tomasz Torcz schrieb am 22.06.2015 um 19:08:
> 
>   So this should be relevant:
> https://www.raspberrypi.org/documentation/hardware/raspberrypi/mechanical/Raspberry-Pi-B-Plus-V1.2-Mechanical-Drawing.pdf
> https://www.raspberrypi.org/documentation/hardware/raspberrypi/mechanical/Raspberry-Pi-B-Plus-V1.2-Mechanical.dxf

Again - this is from the top.

Bye

Stefan

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#8960

On 6/22/2015 9:43 AM, Stefan Krister wrote:
> Hi,
>
> I'm developing a 19" rack mount "case" in OpenSCAD for the Raspberry Pi
> 2 Model B. I would like to have the mechanical dimensions to put the
> holes and cutouts at the right places. The only thing I found are
> measurements from the top but not from the side or front/back.

This is one of many reasons why the rPi is not a good choice to use in 
any commercial product.  It just is not specified enough to count on any 
aspect of it remaining constant over the life of a product it is used 
in.  Of course you didn't say you were using it in a commercial product. 
  In that case I would think the one accurate mechanical drawing 
available and your own measurements should suffice.

When I searched for this info I found the images were most important, so 
I did an image search.  I found the heights of the top side connectors 
easily.  The bottom side components were no so easy to find. 
Fortunately they were no so important to me.

-- 

Rick

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#8963

rickman wrote:

> one of many reasons why the rPi is not a good choice to use in any
> commercial product.  It just is not specified enough to count on any
> aspect of it remaining constant over the life of a product it is
> used in.

They do bear this in mind (from the Pi2 launch blog entry)

"We have a lot of industrial customers who will want to stick with 
Raspberry Pi 1 for the time being. We’ll keep building Raspberry Pi 1 
Model B and Model B+ as long as there’s demand for it"

There's also the Pi Compute Module.

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#8976

Hi Tomasz,

Tomasz Torcz schrieb am 22.06.2015 um 17:59:
> 
>  Does this help?

nope.

Because this is already well described in the drawing from the _top_.

Bye

Stefan

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#8978

Hi Martin,

Martin Gregorie schrieb am 22.06.2015 um 18:04:
>
> Does OpenSCAD let you import photos so you can draw over them on another 
> layer?  

No, it doesn't.

> Alternatively, if you own a vernier caliper or even a good steel ruler, 
> why not use that to measure the RPi pcb, hole positions, etc? That 
> should  should be accurate enough. You can use the caliper or a set of 
> drills to measure the hole sizes very accurately. 

Sure I did that already. But as mentioned earlier - it would be nice if
there is a drawing with measurements from the side, front and back.

Bye

Stefan

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#8984

Theo Markettos <theom+news@chiark.greenend.org.uk> wrote:
> What I did was import photos into Inkscape, scale and orient them as
> appropriate, then draw over them.  Export as DXF, include the DXF in
> OpenSCAD as a line, then extrude the path in OpenSCAD to make a shape.
> The resulting laser-cut output was pretty accurate.
> 
> (OpenSCAD is a description-based 3D modelling package - it's all code,
> there's no 'layers' or 'drawing')

Forgot to add, the first step in the process was to scan the hardware (not
RPi related) using a photocopier that produced scale-accurate PDFs that
could be imported into Inkscape with correct dimensions.

The main awkwardness was parallax - if things aren't planar then the depth
makes the dimensions slightly inaccurate.

Theo

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#8987

On Wed, 24 Jun 2015 18:18:08 +0100, Theo Markettos wrote:

> The main awkwardness was parallax - if things aren't planar then the
> depth makes the dimensions slightly inaccurate.
>
Which is why I mentioned using GIMP's perspective tool to correct for 
incorrect (handheld) camera positioning.

However, if you have the time, there's not a lot that can beat using a 
vernier caliper to measure dimensions and either that or a drill set for 
hole dimensions.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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#8986

On 6/24/2015 2:49 AM, Stefan Krister wrote:
> Hi,
>
> Woody schrieb am 22.06.2015 um 17:53:
>> "Stefan Krister" <stefan.krister@creative.chaos.de> wrote in message
>> news:cuqhn7F7u8qU1@mid.individual.net...
>>>
>>> I would like to have the mechanical dimensions to put the
>>> holes and cutouts at the right places. The only thing I found are
>>> measurements from the top but not from the side or front/back.
>
>> Google 'fixing sizes 19in rack mount' and go to the images section -
>> you will find there everything you need.
>
> People don't read. Or don't understand. The rack isn't the problem since
> it's well described all over the internet.
>
> Measurements from the front, back and side of the Pi aren't. There is
> only a drawing from the top.

If you search more, especially on images, you can find measurements 
others have made.  Some of them give wrong info, so verify everything 
for yourself.

-- 

Rick

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