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2941 Views 7 Replies Latest reply: Dec 15, 2011 7:38 AM by Donald T Anderson RSS
ptc-147279 Copper 14 posts since
Oct 26, 2006
Currently Being Moderated

Oct 26, 2010 1:06 PM

Mechanism Viewing

Why is it that sometimes when I construct a mechanism and view the movement it is the ground body that moves and the moving body is stationary?

  • CasparMu Copper 5 posts since
    Oct 20, 2008
    Currently Being Moderated
    Nov 7, 2010 10:31 PM (in response to ptc-147279)
    Re: Mechanism Viewing

    please let me know the detail.

      • DavorGranic Silver 165 posts since
        Jul 2, 2010
        Currently Being Moderated
        Nov 7, 2011 2:14 AM (in response to ptc-147279)
        Re: Mechanism Viewing

        Similar thing happend to me long ago but when i use drag on some mechanisms (exp. wardrobe closet rotated insted of its door). Selecting some view before draging helped. But basicly i had hinge poorly constrained.

  • KulbirSandhu Bronze 12 posts since
    Apr 20, 2011
    Currently Being Moderated
    Nov 4, 2011 12:27 AM (in response to ptc-147279)
    Re: Mechanism Viewing

    when i face this problem in gearing i just switch to default views front, top...etc.after that grd gear remains stationary,and moving rotates about it. might this help you in your problem.

  • s.iyer Silver 101 posts since
    Jan 23, 2011
    Currently Being Moderated
    Nov 4, 2011 8:15 PM (in response to ptc-147279)
    Re: Mechanism Viewing

    Don't know what exactly is happening. However, I normally follow this practice,

    The ground body is the FIRST part in the assembly and is assembled to Default constraints or is FULLY constrained.

    All other members of the mechanism are then assembled to the Ground member with mechanism constraint.

  • ptc-4184519 Copper 1 posts since
    Nov 24, 2011
    Currently Being Moderated
    Dec 6, 2011 3:18 AM (in response to ptc-147279)
    Re: Mechanism Viewing

    if this problem occurs means u can can the body and ground.

  • Donald T Anderson Copper 14 posts since
    Aug 22, 2006
    Currently Being Moderated
    Dec 15, 2011 7:38 AM (in response to ptc-147279)
    Re: Mechanism Viewing

    I have seen this to, but in my case I think it is related to saving a higher level assembly.
    Example: my sub assembly has the grounded component on the right hand side (which is real world) and all of my components build on to it moving to the left.

    The toplevel assembly has its grounded component on the left hand side of the assembly (these toplevel components do not move at this level) and my sub assembly is assembled to this toplevel assembly to the right.

    Having grounds on both sides of the assembly is not ideal or normally wanted in the assembly but using mechanism general constraints allows this to work. (not how I would want to build the assembly).

    If the toplevel and my sub assemblies are saved at the same time after draging or moving the moving parts.  I think this is where Pro/E gets confused and flips the grounded parts.

    The only way I have found to fix this is to insert at the first component, redefined it and all components after it.
    Hoping someone else has a better fix.

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