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  1. #1
    Join Date
    5th February 2009
    Location
    Montreal, Qweebec
    Posts
    3,603

    Eggtimer (Quantum) mounting

    Hi,
    I have an Eggtimer Quantum, and as I'm about to mounting it, I realise the components are mighty close to the mounting holes. But man, those holes are big for a #2, and no head space for a #4.. The 'real estate' around the holes in almost non existent. #2 screws ('servo' screws) on standoffs seems right.. I guess I don't have to be too accurate with the hole placement on the sled!

    -paul

    NAR# 101258 - L2
    www.CRMRC.org
    I don't know the same things you don't know..

  2. #2
    Join Date
    18th June 2014
    Posts
    123
    I mounted one a couple of days ago, I used 3 x M3 and 1 x M2 bolts with nuts. Instead of stand-offs I used a short section of vinyl tubing on the bolt. The M2 is just a tiny bit bigger than the hole in the Quantum so I added a washer there as well.



    cheers - mark


  3. #3
    Join Date
    13th October 2014
    Location
    SouthEastern, WA
    Posts
    6,105
    I use 2-56 nylon screw as mounting for my Eggfinder Quantum, there is something about having metal screws that close to components that makes me a bit nervous, and I can trim the head of the screw easily enough, or put a nut on top the board and use the screw head on the back of the sled as the nuts with the flats sometimes fit better. If I am worried about exceleration shearing the screws I can always glue or build a bulkhead for the altimeter to push against at both ends.

    Click image for larger version. 

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    Rich

    NAR# 99154

    L3-4x upscale Estes Cherokee-D- AT M1297W 5/28/2016 http://www.rocketryforum.com/showthr...r-rharshberger

    TriCities Rocketeers NAR section# 736 http://www.tricitiesrocketeers.org/

  4. #4
    Join Date
    19th January 2009
    Posts
    984
    I use M3 socket cap screws for mounting electronics. Partly because I already have a bunch of them, but they fit well and have the needed clearance for nearby components on every board I've use so far. I also have matching heat-set inserts so I can use 3D printed mount plates and easily put strong threads where I want them.

  5. #5
    Join Date
    20th June 2015
    Location
    Vermont
    Posts
    419
    Quote Originally Posted by dr wogz View Post
    Hi,
    I have an Eggtimer Quantum, and as I'm about to mounting it, I realise the components are mighty close to the mounting holes. But man, those holes are big for a #2, and no head space for a #4.. The 'real estate' around the holes in almost non existent. #2 screws ('servo' screws) on standoffs seems right.. I guess I don't have to be too accurate with the hole placement on the sled!
    Paul,

    Did you build the Quantums yourself? I have a couple of un-built Quarks but thinking I would rather have gotten the Quantums.
    Jim V

    Champlain Region Model Rocket Club
    CRMRC
    Facebook
    NAR #101467
    L1 - 5/21/16 Estes Mega Der Red Max H128W to 1,021'


  6. #6
    Join Date
    3rd February 2012
    Location
    So Cal (ROC, TRASD, SCRA)
    Posts
    2,659
    We recommend that you either use nylon hardware or that you put nylon washers and spacers between the board and your screws and sled. This goes for all of our products, not just the Quantum... it prevents any chance of shorts due to screw heads/nuts.

  7. #7
    Join Date
    5th February 2009
    Location
    Montreal, Qweebec
    Posts
    3,603
    I normally try to use insulated / non conducting hardware. And I've typically designed boards (asked for) with screw heads in mind. This one just seems to be overly tight on space..

    -paul

    NAR# 101258 - L2
    www.CRMRC.org
    I don't know the same things you don't know..

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