springs

Discussion in 'Pro/Engineer & Creo Elements/Pro' started by dakeb, Jul 28, 2003.

  1. dakeb

    dakeb Guest

    How do you guys handle springs in assemblies? I don't want two models of the
    spring, and have modelled it uncompressed for the spring drawing. But in the
    assy I want it shown compressed.

    Any ideas?

    Dave
     
    dakeb, Jul 28, 2003
    #1
  2. dakeb

    D.Miller Guest

    I believe Wildfire has the ability to model a spring in different
    states. If you are are using an earlier version of Pro you might use an
    assembly relation to modify the spring within the assembly. This will
    work if all identical springs in the assembly are compressed the same.
    You might also make a family table for the spring with various instances
    at different heights. Assembly cuts could be used to bring a spring in
    an assembly to the proper height although cutting a spring to height is
    not the same as compressing it. I guess it depends on how true to
    reality you want to be and how much effort you wish to expend. One last
    suggestion is to make a snapshot of the views of the spring in the
    spring drawing and then modify the spring to its compressed state for
    the assembly.
     
    D.Miller, Jul 28, 2003
    #2
  3. dakeb

    David Janes Guest

    Hey, Dave, isn't there a cosmetic spring, you know, so it'll show up in the
    drawing as a squiggly line? Anyway, leave it to the die makers. They don't
    want the die designers messing with springs, they say they always cock them
    up.

    That was the short answer, there's a longer one, if you want it.

    David Janes
     
    David Janes, Jul 28, 2003
    #3
  4. dakeb

    M.N.M. Guest

    One trick I've used in the past:
    1.) Create an offset plane.
    2.) Use the original and offset planes as the boundaries for the
    begining Helical Sweep section.
    3.) After creating the spring, set the pitch of the spring equal to #
    of turns divided by the Planar Offset Distance.
    4.) In the assembly use relations or (in 2001 and up) Analysis
    Features to drive the Planar Offset Distance.

    I am unsure if a Family Table Member can be used for item three above.
    If so then the spring can be shown as uncompressed and compressed.

    M.N.M.
     
    M.N.M., Jul 28, 2003
    #4
  5. another possiblity is to create the spring as a surface, I often do this for
    studs and stadoffs in sheet metal. The features that will interfere with the
    sheetmetal are surfaces, and don't show up as interferences.

    cheers
    Craig
     
    craig stevens, Jul 29, 2003
    #5
  6. The way that I have always done this is to model the spring compressed.
    Then add a datum plane at the uncompressed height. In your drawing add then
    note spring in shown compressed. Then show 2 dimensions one from the bottom
    of spring to the top and add the note compressed length. Then show the
    dimension from the bottom of the spring up to your datum plane and add the
    note uncompressed length. You might what to change the text size of
    uncompressed length maybe make it bold to make sure you get your point
    across.
     
    John Morrison, Aug 3, 2003
    #6
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