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How to read mass? [fixed]

Discussion in 'Using Alibre Design' started by sz0k30, Oct 19, 2020.

  1. Max

    Max Administrator Staff Member

    What, you don't like
    xx:3.23919129431E-11 yy:1.099992222E-09 zz: 1.29929999444E-10?

    Savage. :D
    simonb65 likes this.
  2. sz0k30

    sz0k30 Senior Member

    Good to see you have a sense of humor, Max!
  3. Engr62

    Engr62 Member

    @Max, will the mass fix be installed with the v22 update if I allow Alibre Design to update when I start up? (I've been having it "remind me tomorrow" until the mass fix was made). Thanks!
  4. beastro

    beastro Senior Member

    +1. I personally prefer scientific notation, but I can see why it might be counterintuitive as well.
  5. beastro

    beastro Senior Member

    Please Max, can you post a copy of that assembly? :p:D
  6. simonb65

    simonb65 Alibre Super User

    The mass fix is in build 22053, which is available now if you just let it update at start up.
    Engr62 likes this.
  7. NateLiqGrav

    NateLiqGrav Alibre Super User

    I'm not Max but here is one of mine. The part is completely centered on the origin - but look at the results.

    Design summary
     Parts : 1
     Faces : 6
     Edges : 12
     Vertices : 8
     Unique parts : 1
    Volume = 9E1 in³
    Mass = 2.546852942E1 lbm
    Center of Mass = [ -9.955841225E-16 in, 2.427855290E-16 in, 0 in ]
    Surface Area = 1.260000000E2 in²
    Mass moments of inertia =
    xx:7.216083337E1 in²·lbm yy:9.550698534E1 in²·lbm zz:1.294650246E2 in²·lbm
    yz:2.434405665E-15 in²·lbm zx: 0 xy:4.868811331E-15 in²·lbm
    Principal Axes and Moments of inertia =
          7.216083337E1 in²·lbm  {1,  0,  0}
          9.550698534E1 in²·lbm  { 0, 1,  0}
          1.294650246E2 in²·lbm  { 0,  0, 1}

    Attached Files:

    beastro likes this.
  8. GIOV

    GIOV Alibre Super User

  9. sz0k30

    sz0k30 Senior Member

    A HUGE improvement in V23!!!

    Design Summary for 00173

    Volume = 752.17 in³
    Mass = 24.74 lbm
    Surface Area = 4369.53 in²

    Center of Mass
    [ 21.77 in, .81 in, -.02 in ]

    Mass Moments of Inertia
    xx: 594.95 in²lbm
    yy: 16447.19 in²lbm
    zz: 16611.12 in²lbm
    yz: 2.75 in²lbm
    zx: -6.77 in²lbm
    xy: 453.14 in²lbm

    Moments of Inertia and Principal Axes
    578.45 in²lbm {1, 0, 0}
    4725.59 in²lbm {0, 1, .02}
    4873.2 in²lbm {0, -.02, 1}

    Geometry Summary
    Parts : 16
    Faces : 1498
    Edges : 3878
    Vertices : 2426
    Unique parts : 16
  10. Hunter

    Hunter Senior Member

    Now we just need a CoG symbol in the 3D model that also shows in the 2D drawing environment.
  11. sz0k30

    sz0k30 Senior Member

    That would be a nice addition!
  12. idslk

    idslk Alibre Super User

    You've asked for that and THIS_SCRIPT produces a CoG part inside your design and this "Symbol" is also visible in a 2D drawing. Why dont'you use it?

  13. JST

    JST Alibre Super User

    And can be measured to! Showing is nice, numbers are better.

    IIRC there are a few things that show in drawings but cannot be measured to in V22 and earlier.
  14. idslk

    idslk Alibre Super User

  15. GIOV

    GIOV Alibre Super User

    Normally the symbol of the cg in the 2D Drawing is this:
    Last edited: Jun 17, 2021
  16. NateLiqGrav

    NateLiqGrav Alibre Super User

  17. GIOV

    GIOV Alibre Super User

  18. NateLiqGrav

    NateLiqGrav Alibre Super User

  19. Hunter

    Hunter Senior Member

    No offense (I do use yours), but I feel Alibre should have this built-in.
    KeithH likes this.

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