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  1. #1
    Join Date
    26th October 2016
    Posts
    126

    Altimter CAD models

    Hello TRF,

    I'm starting to design a couple of 3D printed AV sleds for my L3 project (Performer 150 from Performance Hobbies). I'm planning to use a Missileworks RRC3 as the primary altimeter and an Eggfinder Quantum for the backup. Both with be powered with (separate) 2S 1200mAh batteries. The nose cone is going to house an Eggfinder GPS tracker; with the same battery as the altimeters.

    I have the hole patterns and dimensions for the electronics but prefer to have (at least a low fidelity) cad model that i can use to visualize the design prior to printing, hopefully reducing the number of cycles needed to get a usable design. Does anyone have a cad model of ant of the previously mentions electronics boards? Care to share? If not, I'l probably model it with combination of cubes and blocks, which I'd be happy to share if anyone else wants it.

    Thanks.

    NAR level 2: Mad Cow Super DX3

  2. #2
    Join Date
    8th September 2015
    Posts
    52
    Sorry I don't have those. I have an Eggtimer in SolidWorks. It started a quick sketch of a few blocks for my 4" av bay then got more refined as my av bays got smaller. I reached the component level for my 38mm min dia Mongoose.


  3. #3
    Join Date
    9th October 2013
    Location
    San Jose, CA
    Posts
    659
    What CAD software are you using? What format are you looking for? I have modeled all 3 of these items in OpenSCAD, I could post .STLs pretty easily, the source would take a bit more work since it depends on multiple library files to actually capture the parts. My focus was on bottom-side accuracy so that my 3D prints could have all the right 'grooves' so that a part would sit flat, though I also modeled the major top-side components, more for looks and reference (checking orientation, basic clearances, etc).
    Will Ferry (Launches & Videos) NAR #96512 (L2) / TRA #15328 (L2) / LUNAR #2759
    L1: 9/2013 @ XPRS, GLR T-Bolt "Thunderbolt" (R.I.P.), H148R
    L2: 4/2016 @ TCC Helm, Binder Design Excel w/DD "dd2.xls", J315R
    Impulse flown (flights): 2013: 767Ns (2), 2014: 4298Ns (8), 2015: 7486Ns (16), 2016: 11693Ns (18), 2017: 11138Ns (16)

  4. #4
    Join Date
    18th January 2009
    Location
    Austria
    Posts
    747
    In my experience, it helps if mechanical models of electronics show at least semi-accurate depictions of the connectors. This way it becomes more apparent where some free room for the wire harness is needed. This is especially important when the CAD designer is not familiar with the electronics, although this is less of a problem in one man rocketry projects.

    3D models for most connectors can be found online. The following ones should be either accurate or at least close enough to approximate the real connectors:

    RRC3
    https://www.phoenixcontact.com/onlin...il:pid=1727036
    https://www.phoenixcontact.com/onlin...il:pid=1727010
    https://www.hirose.com/product/en/pr...D2DSA%2801%29/
    https://www.hirose.com/product/en/pr...D2DSA%2801%29/
    http://www.sullinscorp.com/product/?...T-BK&toggle=in

    Eggfinder Quantum
    https://www.phoenixcontact.com/onlin...il:pid=1725672
    https://www.phoenixcontact.com/onlin...il:pid=1725656

    If you want more details, pretty much anything else on the PCB can also be found online, if not on the manufacturers site then on places like grabcad.com. Google for example for terms like "ESP8266-12", "TO-220", "3mm LED" etc in connection with "3d model" or "step model" to find those models. If you need help identifying a particular package, post an image and size information.

    Reinhard

  5. #5
    Join Date
    26th October 2016
    Posts
    126
    Quote Originally Posted by woferry View Post
    What CAD software are you using? What format are you looking for? I have modeled all 3 of these items in OpenSCAD, I could post .STLs pretty easily, the source would take a bit more work since it depends on multiple library files to actually capture the parts. My focus was on bottom-side accuracy so that my 3D prints could have all the right 'grooves' so that a part would sit flat, though I also modeled the major top-side components, more for looks and reference (checking orientation, basic clearances, etc).
    I'm using Rhino which can import STLs, which is sufficient for my use. Would you mind sharing them?
    NAR level 2: Mad Cow Super DX3

  6. #6
    Join Date
    9th October 2013
    Location
    San Jose, CA
    Posts
    659
    Attaching a .zip file with 2 different versions of each part. I've found with Cura I need to oversize everything by my nozzle diameter to ensure the proper dimensions on cut-outs. So the "_OS" parts include a 0.4mm oversizing on everything (PCB is only grown in X/Y, not Z), the "_noOS" parts do not have this oversizing. I can change the oversizing with a single variable if you want a value other than 0.4mm. For the Quantum I assume a maximum bottom-side "solder-tail" clearance of 2.1mm, again it's a single variable to adjust this so I can tweak if you need more or less. For the EF TX the equivalent solder-tail clearance is 1.5mm. I always heat-shrink the GPS module so there's an allowance for that as well, I could remove it but it would take a bit more work. I've also only ever used the brass rod antenna, so I don't have any data on the SMA connector. Similarly I direct-solder the Quantum battery/charge leads, so I have solder tail clearances but nothing on the top (no terminals). I can also replace the holes with pegs (to create holes) if desired, would just need to know the depth required on the top and bottom. Hope this helps.

    Click image for larger version. 

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    Attached Files Attached Files
    Will Ferry (Launches & Videos) NAR #96512 (L2) / TRA #15328 (L2) / LUNAR #2759
    L1: 9/2013 @ XPRS, GLR T-Bolt "Thunderbolt" (R.I.P.), H148R
    L2: 4/2016 @ TCC Helm, Binder Design Excel w/DD "dd2.xls", J315R
    Impulse flown (flights): 2013: 767Ns (2), 2014: 4298Ns (8), 2015: 7486Ns (16), 2016: 11693Ns (18), 2017: 11138Ns (16)

  7. #7
    Join Date
    26th October 2016
    Posts
    126
    This is perfect. Thanks for sharing

    NAR level 2: Mad Cow Super DX3

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