DIY cMP under-desk suspension.

Discussion in 'Mac Pro' started by mattspace, May 6, 2016.

  1. mattspace macrumors 6502

    mattspace

    Joined:
    Jun 5, 2013
    Location:
    Australia
    #1
    hi folks,

    Just thought id share a few pics of a simple diy solution to mount the cMP on the underside of a desk, for people who are short on knee & foot space, and want to keep access to the inside of their machine, plus free airflow etc.

    [​IMG]

    [​IMG]

    [​IMG]

    All threaded galvanised pipe. Its suppsed to be a plumbing product, but as a guy at the hardware store remarked once, its mostly used by people making furniture now.

    Bits on the end unscrew to make it easier to lift the machine on to them, and go back on to provide a bit of a safety lip. Electrical tape to pad the galvanised pipe and stop and metal on metal contact.

    Cheers.
     
  2. SoyCapitanSoyCapitan macrumors 68040

    SoyCapitanSoyCapitan

    Joined:
    Jul 4, 2015
    #2
    Nice. There is a company that offers an underside desk mount but you did it better.
     
  3. thornslack macrumors regular

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    Nov 16, 2013
  4. mattspace thread starter macrumors 6502

    mattspace

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    #4
    I remember looking at something like that years ago, and from memory It was in the >$100 range.
     
  5. DPUser macrumors 6502a

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  6. ifraaank macrumors regular

    ifraaank

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    #6
    This is really a fantastic idea.. I might try doing that on my desk as soon as I'm done building it. :D
     
  7. AidenShaw macrumors P6

    AidenShaw

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    The Peninsula
    #7
  8. lowendlinux Contributor

    lowendlinux

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    North Country (way upstate NY)
    #8
    Good work..I just stick my tower in an Ikea cabinet with no back because I'm not creative and don't want to see my computer
     
  9. phillyboy82 macrumors regular

    phillyboy82

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    Oct 27, 2015
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    Not from Philly
    #9
    I like it! Looks very straightforward to do.

    Do you by chance have the space dimensions that we should be going for when we mount the hangers?
     
  10. mattspace thread starter macrumors 6502

    mattspace

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    Jun 5, 2013
    Location:
    Australia
    #10
    I honestly didn't record any. I just took the threaded pipes out of the elbows and put my computer on the upturned desk in the place I wanted it to be, then put the assembled flanges and elbows where I wanted them to be for the end of the machine they were on the outside of (in this case, the exhaust side). Then, measured the length of the mac to locate the second pair. Given the machine is the same top and bottom it's pretty straightforward.
     
  11. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #11
    Hmmm, I suppose with different pipe spacing you could also mount the Mac Pro horizontally with the door facing down for access.
     
  12. AidenShaw macrumors P6

    AidenShaw

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    #12
    Might be a problem for knee room - but sure.
     
  13. scott.n, May 11, 2016
    Last edited: May 11, 2016

    scott.n macrumors 6502

    Joined:
    Dec 17, 2010
    #13
    For horizontal mounting, I'd have the door facing up. I wouldn't want gravity working against the HDDs, PCIe cards, or the processor tray - especially when the door was opened.
     
  14. h9826790 macrumors 604

    h9826790

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    Hong Kong
    #14
    If face up, may be can keep the door open for better cooling. Nothing can get in anyway.
     
  15. AidenShaw macrumors P6

    AidenShaw

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    #15
    Door open would give worse cooling.

    The design is for front to back airflow. With the door open you'd have dead spots - for example the PCI fan airflow would go out the door, not over the PCIe cards and out the back.
     
  16. h9826790 macrumors 604

    h9826790

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    Location:
    Hong Kong
    #16
    Yes, agree with this if the Mac Pro in normal orientation. TBH, to place it horizontally, I have absolutely no idea keep the door close will be better or worse.

    Hot air rise, if put it horizontally and open the door, the hot air generated from the device can easily rise. So, this should give better cooling. However, as you said, the air flow now no longer directed correctly, which may reduce the airflow on certain area. Therefore, this is an unknown.

    In fact, I think just place the Mac Pro horizontally is already an unknown to the cooling effect. The Mac Pro's cooling system should design according to hot air rise, by putting it horizontally, the original designed airflow may be affected already.

    Most likely some area will be better, but some area getting worse. And since the better cooled area cannot compensate the worst cooling area. Any one of the device overheat may effectively kill the Mac Pro. So, we better keep it like what OP does, and keep the door close. Rather than create the "uneven cooling" effect.
     
  17. AidenShaw macrumors P6

    AidenShaw

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    #17
    Yes, but circulation is more powerful than convection.

    The current case blocks convection by having different fan zones.

    cooling[1].jpg
     
  18. h9826790 macrumors 604

    h9826790

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    Location:
    Hong Kong
    #18
    Thanks for teaching me this. Learn something today.

    Anyway, that means this is still the best choice. Should be relatively easy to hang like this under the desk.
    cooling[1].jpg
     
  19. AidenShaw macrumors P6

    AidenShaw

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    Location:
    The Peninsula
    #19
    ..as long as there's plenty of clearance on top. The original design would put the top very close to the desk surface, which might partially block the exhaust air.

    I'd be more concerned with making sure that the hot exhaust air isn't trapped under the desk and circles back into the intake.
     
  20. jared_kipe macrumors 68030

    jared_kipe

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    Dec 8, 2003
    Location:
    Seattle
    #20
    You're neglecting the work the fan would need to do to lift the air against gravity.
     
  21. scott.n, May 12, 2016
    Last edited: May 12, 2016
  22. h9826790 macrumors 604

    h9826790

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    #22
    Is that significant at all?
     
  23. AidenShaw macrumors P6

    AidenShaw

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    Feb 8, 2003
    Location:
    The Peninsula
    #23
    Yes, that's why we don't have hot air balloons.

    61a71b18490b3503efd7ac2b66eb878a[1].jpg
     
  24. ActionableMango macrumors 604

    ActionableMango

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    Sep 21, 2010
    #24
    What is that third balloon, a bottle of Scotch?
     
  25. AidenShaw macrumors P6

    AidenShaw

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    #25

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