H2 BladeCenter

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rvalle
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H2 BladeCenter

Unread post by rvalle » Thu Nov 07, 2019 5:23 pm

( this project post started as a discussion in OpenSCAD H2 Model )
hominoid wrote:In case there are some new dedicated x86 community members who do not regularly look at the ARM forums,
there is an OpenSCAD H2 model available here.
Using this fantastic OpenSCAD H2 Model I am working on a blade center similar to the fantastic one created by Clear Simple that I recently remixed.
You can find the details here https://www.thingiverse.com/thing:3929164

Looks like this:
IMG_20191020_160816.jpg
IMG_20191020_160816.jpg (409.73 KiB) Viewed 1057 times
Last edited by rvalle on Thu Nov 07, 2019 5:44 pm, edited 1 time in total.
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Re: H2 BladeCenter

Unread post by rvalle » Thu Nov 07, 2019 5:35 pm

For a more realistic model, here is an assembly of the h2 with peripherals and heat-sink on:
H2-Periferals.PNG
H2-Periferals.PNG (201.94 KiB) Viewed 1054 times
H2-HeatSink.PNG
H2-HeatSink.PNG (346.38 KiB) Viewed 1054 times

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Re: H2 BladeCenter

Unread post by rvalle » Thu Nov 07, 2019 5:37 pm

Here comes the design of the caddy:
H2-Caddy.PNG
H2-Caddy.PNG (276.69 KiB) Viewed 1054 times
H2-Caddy2.PNG
H2-Caddy2.PNG (99.32 KiB) Viewed 1054 times
H2-Caddy3.PNG
H2-Caddy3.PNG (106.82 KiB) Viewed 1054 times
H2-Caddy4.PNG
H2-Caddy4.PNG (188.24 KiB) Viewed 1054 times
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Mullcom (Thu Nov 07, 2019 5:55 pm)

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Re: H2 BladeCenter

Unread post by rvalle » Thu Nov 07, 2019 5:41 pm

And the first 3d print.
It pretty much works, but I will try to make the pillars a bit thicker.
Also, will test if it is possible to add/remove RAM and SSD while on the Caddy, perhaps I need to cut some more here and there to get better accessibility.
photo_2019-11-06_22-04-06.jpg
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photo_2019-11-06_22-04-00.jpg
photo_2019-11-06_22-04-00.jpg (176.06 KiB) Viewed 1054 times
photo_2019-11-06_22-04-15.jpg
photo_2019-11-06_22-04-15.jpg (131.38 KiB) Viewed 1054 times

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Re: H2 BladeCenter

Unread post by odroid » Thu Nov 07, 2019 5:53 pm

Nice 3D printings!

Please consider writing an article for our Magazine.

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Re: H2 BladeCenter

Unread post by Mullcom » Thu Nov 07, 2019 5:57 pm

rvalle wrote:And the first 3d print.
It pretty much works, but I will try to make the pillars a bit thicker.
Also, will test if it is possible to add/remove RAM and SSD while on the Caddy, perhaps I need to cut some more here and there to get better accessibility.
photo_2019-11-06_22-04-06.jpg
photo_2019-11-06_22-04-00.jpg
photo_2019-11-06_22-04-15.jpg
Can you pleas upload this files here?

Can be fun to test this out. I yast buy a 3d printer. Is this slave working with other bords Also?

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Re: H2 BladeCenter

Unread post by rvalle » Thu Nov 07, 2019 7:13 pm

odroid wrote: Please consider writing an article for our Magazine.
I a happy to present the BladeCenter in the magazine, once that it is finished.

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Re: H2 BladeCenter

Unread post by mad_ady » Thu Nov 07, 2019 9:53 pm

What about the enclosure where you are connecting the caddies? Is it printed as well?

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Re: H2 BladeCenter

Unread post by Mullcom » Thu Nov 07, 2019 11:45 pm

For power i sugest that at today the best way is to go with old PSU

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Re: H2 BladeCenter

Unread post by rvalle » Fri Nov 08, 2019 6:26 am

Mullcom wrote:For power i sugest that at today the best way is to go with old PSU
Which one is tha power supply? I did not know there was more than one.

With regards to the uploads, let me try it 3d files first. see below

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Re: H2 BladeCenter

Unread post by rvalle » Fri Nov 08, 2019 6:59 am

I have been working on the Mount for the caddy and the ears to attach the whole thing to the rack.

The Blade center will be 3U, that fits perfectly. However I could not make 8 H2s in 3Us for a very few millilitres.

Unfortunately the audio connectors are very tall, 4mm taller than the other connectors, which times 8 is 32 millimetres.

Finally I decided to make an unusual hack, letting each audio connector embed in the next block:
H2Mounted.PNG
H2Mounted.PNG (276.85 KiB) Viewed 915 times
The Audio block is higher than the mount, as you can see on this side view.
H2Mounted2.PNG
H2Mounted2.PNG (105.7 KiB) Viewed 915 times
However, a socket has been created on the base of the mount to embed the audio connector from the previous H2 block.
H2Mounted3.PNG
H2Mounted3.PNG (168.14 KiB) Viewed 915 times
With this hack it seems possible to fit 8 H2s in 3Us.

Also, note that the mount has been created in a way that no support should be required to 3D print it, which will save time and plastic.
Little knobs and holes have been created to ensure good alignment.

Here you can see how each audio connector embeds in the next block, saving space to allow 8 units in 3Us.
H2BladeCenter4.PNG
H2BladeCenter4.PNG (116.18 KiB) Viewed 915 times
Once you put them toguether the blade center looks like this:
H2BladeCenter.PNG
H2BladeCenter.PNG (123.25 KiB) Viewed 915 times
I am going to be printing this weekend to test if all the parts work as expected.
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Re: H2 BladeCenter

Unread post by rvalle » Fri Nov 08, 2019 6:36 pm

I have now Received the RAM and SSD for my H2.
... and the outer SODIMM cannot be installed while the H2 is in the Caddy, everything else is accessible.

In case of having to replace hardware, upgrade memory, etc. Its nice if not many work is required.
photo_2019-11-08_10-31-02.jpg
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Re: H2 BladeCenter

Unread post by rvalle » Fri Nov 08, 2019 6:41 pm

And for the brave, here comes a first STL pre-release.
Includes the caddy (in 2 versions: Self Tapping screw and another for M3 HeatLock Brass Inserts)
Mount and Ears (left/right).

As you can see above the parts have almost not been tested and surely will change.
H2BladeCenterSTL-Alpha-NotTested.zip
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Re: H2 BladeCenter

Unread post by rvalle » Fri Nov 08, 2019 6:47 pm

First mount print came out and seems to be working OK. (thought I posted this already...).
photo_2019-11-08_08-45-34.jpg
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photo_2019-11-08_08-45-38.jpg
photo_2019-11-08_08-45-38.jpg (145.5 KiB) Viewed 858 times
Next will see if 2 mounts chain themselves OK.

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Re: H2 BladeCenter

Unread post by Mullcom » Fri Nov 08, 2019 7:22 pm

rvalle wrote:
Fri Nov 08, 2019 6:26 am
Mullcom wrote:For power i sugest that at today the best way is to go with old PSU
Which one is tha power supply? I did not know there was more than one.

With regards to the uploads, let me try it 3d files first. see below
I am talking about how to power all this devices. and minimize Cabling and adapters.

Instead to have one adapter for every device you can modify PSU so PSU can power all this devices in the slave. i got that tip from user domih here on forum.

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Re: H2 BladeCenter

Unread post by rvalle » Fri Nov 08, 2019 9:01 pm

Ok, the second mount came out and it is working well with the first one.
The alignment knobs work well, but the holes need to be clean of plastic for them to do their job properly.
The cut out to embed the audio connectors in the next mount seems also good.
Looks improbable that modifications will be required to this part.
photo_2019-11-08_13-00-25.jpg
photo_2019-11-08_13-00-25.jpg (154.63 KiB) Viewed 830 times

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Re: H2 BladeCenter

Unread post by Mullcom » Sun Nov 10, 2019 6:55 am

Hello. i hast yast start to 3d print stuff. so i am wondering with program you are using when you modify or creat new 3d models?

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Re: H2 BladeCenter

Unread post by rvalle » Mon Nov 11, 2019 1:01 am

There are many

Opensource you can use openscad or freecad, freemiun there's inventor and onshape.com and professional you have Solidworks...

Probably I have forgotten many...

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Re: H2 BladeCenter

Unread post by Mullcom » Mon Nov 11, 2019 1:20 am

rvalle wrote:
Mon Nov 11, 2019 1:01 am
There are many

Opensource you can use openscad or freecad, freemiun there's inventor and onshape.com and professional you have Solidworks...

Probably I have forgotten many...

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Yes. the best i know is Sracheup.... but i am facing a problem with this blade files. How do i convert this files to STL ???

.SLDPRT ? To STL

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Re: H2 BladeCenter

Unread post by Mullcom » Mon Nov 11, 2019 1:37 am

I start to hate this company SolidWorks to be so annoying to close down for ppl that want to be creative.. thay make a plugin for sketchup but they want have money for it!

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Re: H2 BladeCenter

Unread post by rvalle » Mon Nov 11, 2019 2:02 am

I have uploaded stl, haven't I?

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Re: H2 BladeCenter

Unread post by Mullcom » Mon Nov 11, 2019 2:10 am

rvalle wrote:I have uploaded stl, haven't I?

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Yes you have. But I was trying to get the original model. I am also interested in raspberry pi 4.

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Re: H2 BladeCenter

Unread post by rvalle » Mon Nov 11, 2019 2:34 am

Yes in the thingiverse project I modified the cart only, the other stls are also in thingiverse. Read the instructions. That will work fine for the raspberry pi 4

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Re: H2 BladeCenter

Unread post by Mullcom » Tue Nov 12, 2019 4:48 pm

rvalle wrote:Yes in the thingiverse project I modified the cart only, the other stls are also in thingiverse. Read the instructions. That will work fine for the raspberry pi 4

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I get 30days on the add-on so now I have all files on STL . Going to check the other remix to. My plan is to build more dynamic blade. So in future it working for many types bords. And fix a nice cable setup. Hope

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Re: H2 BladeCenter

Unread post by rvalle » Tue Nov 12, 2019 8:52 pm

Mullcom wrote: My plan is to build more dynamic blade.
Exactly, that is the plan.

Of course RPI and H2 are on different leagues. Like you can have a 2U blade center for small boards and a 3U for bigger ones, like the H2,

This H2 blade enter is a complete redesign, mostly parametric, so that it is easy to port back to 2U and multiple boards.
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Re: H2 BladeCenter

Unread post by rvalle » Thu Nov 14, 2019 4:06 am

At last, I managed to print the whole thing. Had some issues along the way but the measurements worked very well. I am putting my first H2s in service as nodes of my OpenNebula private cloud.

I have also implemented a press fit system so that the blades don't come off the mount easily. Now there's a click and a helper tab to get them out. Similar to the ethernet cables.

As previously suggested another power supply is required. The individual power supply sold here is very rack unfriendly. And 8 of those at the same time will just don't work.

I think the required spec is 15V 32A 480W for the 8 H2s, or maybe better 2x15V 16A 240W for 4+4 H2s so that not "all eggs" sit on the same basket. Would be nice if they take 1U max. MW has both and 1U mount but a bit expensive. Does anyone know othe brands?
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Re: H2 BladeCenter

Unread post by rvalle » Thu Nov 14, 2019 7:55 pm

The Press Fit mechanism works like this:

A knob from the from the mount will insert into the caddy to block it when in place. a small rail in the caddy also allows for inserting the caddy without issues until it clicks.

Here is a section to see the lock system working.
H2Mounted-PressFit-Section.PNG
H2Mounted-PressFit-Section.PNG (168.01 KiB) Viewed 491 times
Then there is also a helper tab that will help release the caddy. Since the enclosure is plastic is the actual deformation of the plastic that allows for the knob to get out of the lock.

Here you can see caddy and tab, how they interact.
H2Mounted-PressFit.PNG
H2Mounted-PressFit.PNG (221.07 KiB) Viewed 491 times
I am not 100% sure that the helper tab is required, but sometimes it is useful. In particular when the blade center is not yet installed in the rack, then is difficult to place force in any direction.

The release bellow includes with/without Press Fit feature and Helper tab. I like the feature because it is easy to drop an H2 when moving the BladeCenter before install it in the rack. Also because ethernet cables can pull the H2 out of the BladeCenter, etc.

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Re: H2 BladeCenter

Unread post by rvalle » Thu Nov 14, 2019 8:13 pm

BOM and V1 RELEASE:

H2-BladeCenter 3Ux8
IMG_20191114_133152.jpg
IMG_20191114_133152.jpg (389.2 KiB) Viewed 468 times

Required Hardware:

- 4x Rods, M6x44.5 cm (Metal or Nylon)
- 4x M6 Nuts
- Optional 32x M3 HeatLok Brass Inserts from PSM International or similar.
- Optional 32x M3x5mm screws for Insert Version
- Optional 32x self tapping screws 5-6mm long (hole is 2.5mm wide)

Printed Parts

- 8xH2 Caddy (either Inserts or Self tapping version) Version with inserts recommended, but requires brass inserts.
- 8xH2 Mount part (vanilla, pressfit or pressfit&tab version) recommended the one with tab.
- 1xEar Left
- 1xEar Right

Equipment:

- 8xH2 Boards ;)
- 3U available in a rack (small depth/network rack is OK)
- (To Be Researched) PSU

Pending and Issues

- I have not tested the SelfTapping screws version of the caddy
- The distributed PSU is not rack friendly.

Feedback for H2 Design

For the particular use case of using the H2 as a rack blade, the following issues have been found:

- The audio connectors are too tall should stay within limits of other connectors.
- The positioning of the power/reset switches is inconvenient, would be better to have them from the front or the caddy.
- The positioning of the leds is also inconvenient
Attachments
H2BladeCenterSTL-V1.zip
(211.31 KiB) Downloaded 8 times
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Re: H2 BladeCenter

Unread post by psomero » Sun Nov 17, 2019 3:13 am

You put the boards in backwards. They should blind mate into a backplane.

JK, really though this is a cool project.

Are you familiar with plastite style thread forming screws? You can get rid of the brass inserts and have just as strong of a joint that is good for ~10 screw insert/remove cycles with a fastener that goes straight into a printed hole. I do a lot of 3D printing and always evangelize for the plastites. They changed my life: https://www.mcmaster.com/plastite-screws

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Re: H2 BladeCenter

Unread post by Mullcom » Sun Nov 17, 2019 6:14 am

Have you seen this ?
https://www.youtube.com/watch?v=iR6OBlSzp7I

This look so nice.

I found ebay to buy this... i think i am going for this next time i shop
https://www.ebay.com/sch/i.html?_from=R ... d&_sacat=0

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Re: H2 BladeCenter

Unread post by rvalle » Tue Nov 19, 2019 9:30 am


psomero wrote: Are you familiar with plastite style thread forming screws?
No, I am not.

I am happy with the inserts for this kind of application. I work a lot with smaller sizes too.

However I find very interesting your link and will definitely check it up. Will order same and test them.


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