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How to read mass? [fixed]

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

  1. HaroldL

    HaroldL Alibre Super User

    I have a simple assembly, consisting of native Alibre parts, that appears to not be correct. Before the 'update' only the weight of the center brace did not match the mass. Now it looks like all parts except the leg don't match. This is confusing. o_O

    Mass - BOM.png
    Mass -Shelf.png
    Mass - Brace.png
    Mass - Leg.png
    Mass -Top.png
  2. Alexander

    Alexander Senior Member

    Same problems here, mass way out.
    I have imported a coupling design into an assembly, the coupling has 5 parts all with the correct materials. When you look at the summary BOM all looks ok but when you turn the summary of it ways 130kg, should only weigh 40grams.
  3. sz0k30

    sz0k30 Senior Member

    3 of your parts are in lbs & 1 part is in Kg?
  4. HaroldL

    HaroldL Alibre Super User

    I thought I'd changed them all to lbs. But it is interesting that the one part in Kg is showing correctly in the BOM. All the lbs parts are wrong or at least not showing the lbs value and showing Kg instead. Is there a setting I'm missing somewhere?

    Never mind... I forgot to set the assy to lbs. Doh...:oops:

    So now how do you get the total of all weights in the BOM? Is there a Sum function for the table?
    Last edited: Nov 11, 2020
  5. Lew_Merrick

    Lew_Merrick Guest

    I just downloaded & installed "Version: V22 64-bit [Build 22051]" and find no improvement in Assembly Weight. An Assembly I have still reports an Assembly Weight of 415.956 lbs when the individual components add up to 386.336 lbs. ??? -- Lew
  6. Max

    Max Administrator Staff Member

    We've identified a bug in some logic surrounding assemblies that contain imported components in certain units giving odd behavior in downstream queries of mass. A fix is incoming quickly. We have not seen any issues where there are no imported parts. We'll be releasing a 2nd SP in days not weeks to address this.

    Lew - can you send me your assembly so I can verify our fix?
  7. sz0k30

    sz0k30 Senior Member

    For what its worth, I'm the guy that started this post. All my parts and assemblies are native Alibre, no imported parts. I rechecked my original files that showed the incorrect weights and they all appear to be correct!
    BeEdHa and bigseb like this.
  8. beastro

    beastro Senior Member

    I also noticed some discrepancies and attach one of the assemblies in question. While the BOM shows correct masses for all parts, the total mass given by ispect->physical properties returns a mass that is incorrect. Only if I supress three hexagonal nuts, do I get the correct mass.
    I attach the files, if you want to check for yourself


    Attached Files:

  9. DavidJ

    DavidJ Alibre Super User Staff Member

    Those 3 nuts have different model units, so we'd expect the forthcoming fix to resolve this. Here is the report from our current test build...

    Does that seem correct?
  10. beastro

    beastro Senior Member

    Yes, around 160g sounds correct
  11. ROTTER

    ROTTER Member

    Max thanks you. After the last correction, it seems that the mass count is correct.
    Eddy So likes this.
  12. Lew_Merrick

    Lew_Merrick Guest

    Hi Max -- I just installed the "fix" and, testing it on 3 Assemblies, the "Mass/Weight" is consistently 20%-25% low as calculated. -- Lew
  13. Max

    Max Administrator Staff Member

    Hi Lew, this fix has apparently fixed the majority of issues on here. It is possible you have a separate issue. I would need your files to take a look.
  14. Lew_Merrick

    Lew_Merrick Guest

    Hi Max -- One "set" was sent to you "a few days ago." Do you need more? -- Lew
  15. Max

    Max Administrator Staff Member

    Mine shows correct per your spreadsheet. Are you sure you have build 22053?

  16. simonb65

    simonb65 Alibre Super User

    Just noticed the update, but why is it still called 'SP1 update' (v22.0.1 [22051] was SP1) when the release version is actually v22.0.2 [22053], suggesting its actually SP2 !! Need to be a bit more consistent with numbering and naming as it is going to cause confusion with many users!
  17. Lew_Merrick

    Lew_Merrick Guest

    Hi Max --
    Date: Wednesday, November 18, 2020 1:04:55 PM
    Alibre Design™ Expert
    Version: V22 64-bit [Build 22053]
    -- Lew
  18. Max

    Max Administrator Staff Member


    For your 10 ft. version - your Excel has the NTM3004011 Rotor Shaft – Rev B part listed as 1.3404 but the physical properties is 1.3404 E1 and so the actual weight should be 13.404.

    Changing this in the Excel gives a total weight, by manually summing each component in Excel, of 534.3038. Checking Physical Properties in the assembly gives 534.3 as well.

    I think you had an oversight of the scientific notation on that one part during manual entry into Excel and then perhaps copied the data into other Excels, but the root cause is you’re off by a factor of 10 for the weight of the rotor shaft part in your Excel. It isn't a software issue - except that scientific notation is unnecessarily confusing and we plan on fixing that shortly.

  19. simonb65

    simonb65 Alibre Super User

    If your changing this, could I suggest (if your not already) that it's an option as to what the display format is (and possible decimal places for non-scientific). I say this as non-scientific is easier to interpret, but scientific gives higher accuracy (by it's nature). So having the ability for the user to decide what they want to see is the best of all worlds.

    Possibly a 'Format' selection and 'Number of decimal places' on the Physical Properties dialog which is saved between sessions would be truly magical! :)
    beastro likes this.
  20. sz0k30

    sz0k30 Senior Member

    YEAH!!!!!!! About time!!!!!

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