Cylinder and 3D Line Degrees of freedom

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  • Cylinder and 3D Line Degrees of freedom

    No coffee this morning so the mind is not so clear

    Ok please confirm:

    A Cylinder used as primary datum constrains 2 rotations and 2 rotations

    A 3D Line constructed between circles constrains the same DOF.
    sigpicIt's corona time!
    737 Xcel Cad++ v2009MR1....SE HABLA ESPAÑOL

  • #2
    4 rotations ?? Do you mean 2 rotations and 2 translations. Maybe I need a coffee. If that's what you meant I agree with the first part the second part sounds right to. Yielding different results ?
    sigpicSTANDING CORRECTED IS THE ONLY WAY I STAND

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    • #3
      lol...typing mistake ..."Translation" is what I meant.

      Thank you!
      sigpicIt's corona time!
      737 Xcel Cad++ v2009MR1....SE HABLA ESPAÑOL

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      • #4
        Originally posted by Roberto View Post
        No coffee this morning so the mind is not so clear

        Ok please confirm:

        A Cylinder used as primary datum constrains 2 rotations and 2 rotations

        A 3D Line constructed between circles constrains the same DOF.
        you are correct.
        sigpic
        Originally posted by Ironhoe
        I got something under my sporran for you, take care of it and you got my vote.

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        • #5
          Originally posted by Lab_ratt View Post
          you are correct.
          Thanks ratt, working overtime today?
          sigpicIt's corona time!
          737 Xcel Cad++ v2009MR1....SE HABLA ESPAÑOL

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          • #6
            If it's a round part you do not need to eliminate the 3rd rotational axis. Leveling to the 3d line will eliminate 2 rotations as you presumed. You can then eliminate 2 translations with this line. All you would need to do is elinate the 3rd translation on one of the surfaces. If this is not a round part, you need to elinate the 3rd rotational axis.
            Marty Dobson
            Director of Quality
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            PC-DMIS CAD V4.2 MR1 & V2011
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            • #7
              I believe that you should check the vector... If you measure the cylinder with circle hits, you should obtain the same axis than the line. If you measure it as a cylinder, maybe you could see some differences, on the vector. You could see them with the xyz also, but with a construction like pierce point on leveled plane for example, because the line and the cylinder aren't defined with the same point.
              Not sure of it, but it could be usefull to check !!!
              Hope you had enough time for a coffee since this new thread

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