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roxanna.j.llina1-Visitor
1-Visitor
March 18, 2008
Question

Projected Area

  • March 18, 2008
  • 6 replies
  • 3042 views
Hello,

Does anyone know how to go about measuring the projectedarea of two parts that intersecting? In other words I have to parts that intersect and I would like to know the area of that intersection with respect to a plane.

Thanks,

Roxanna

    6 replies

    B
    BrentDrysdale12-Amethyst
    12-Amethyst
    March 18, 2008
    Hi Roxanna,
    One way is to use the intersection curve between the two shapes. Firstly make a sketch on the desired projection plane and "use edge" for the intersection curve, making sure it is a complete curve that encloses an area. Secondly highlight that sketch and use Edit/Fill to make a surface. Thirdly use the measure tool to find the area of that new surface. You could merge steps one and two by starting the Fill and making an integral sketch though at this stage I prefer to do it in two steps for better visibility.

    Regards, Brent Drysdale
    Regards, Brent Drysdale
    Mechanical Designer
    Tait Electronics Ltd (www.taitworld.com)
    New Zealand
    Ph. +64 3 358 1093

    Roxanna Llinas wrote:
    Hello,
    Does anyone know how to go about measuring the projectedarea of two parts that intersecting? In other words I have to parts that intersect and I would like to know the area of that intersection with respect to a plane.
    Thanks,
    Roxanna
    B
    BrentDrysdale12-Amethyst
    12-Amethyst
    March 18, 2008
    Hi Roxanna,
    I left out from my previous message how to get the intersection curve (sending this just in case you do not already know how).

    Make a surface feature of the each of the whole parts (Select surface geometry on the part and RMB to get "solid surfaces" or pick it from the top of the model tree. Do the Ctrl C, Ctrl V thing to get the surface copy)

    Once both parts have external surfaces then use the filter to select quilts and select both part quilts. Use Edit/Intersect to make the intersection curve. I think you can make this as an assembly feature but if not then make it in one of your parts. (There may be another way of getting the intersection curve such as possibly through the analysis interference but I haven't tried that).

    The rest is as per my first e-mail.
    One way is to use the intersection curve between the two shapes. Firstly make a sketch on the desired projection plane and "use edge" for the intersection curve, making sure it is a complete curve that encloses an area. Secondly highlight that sketch and use Edit/Fill to make a surface. Thirdly use the measure tool to find the area of that new surface. You could merge steps one and two by starting the Fill and making an integral sketch though at this stage I prefer to do it in two steps for better visibility.

    Hope this helps.

    Regards, Brent Drysdale
    Regards, Brent Drysdale
    Mechanical Designer
    Tait Electronics Ltd (www.taitworld.com)
    New Zealand
    Ph. +64 3 358 1093

    Roxanna Llinas wrote:
    Hello,
    Does anyone know how to go about measuring the projectedarea of two parts that intersecting? In other words I have to parts that intersect and I would like to know the area of that intersection with respect to a plane.
    Thanks,
    Roxanna
    P
    PAULKORENKIEWIC1-Visitor
    1-Visitor
    March 19, 2008
    How about merging the two parts into one to create a part that is only
    the intersection part. Then you can use the silhouette function of trim
    on copied solid surface to create surface edges relative to the plane.
    Then you can use edge in a sketch to create a flat surface, and then
    measure the area of that surface...

    Yes, I know, a bit involved, but this should work... You might have to
    copy surfaces and intersect them to create the part that is only the
    intersection... I have a short list of steps and sample part for the
    silhouette trim function as we use that for creating back fill on
    castings, just let me know if you would like me to send it to you...

    good luck!

    Paul Korenkiewicz
    FEV , Inc.
    4554 Glenmeade
    Auburn Hills, MI, 48326-1766

    R
    rollinsn1-Visitor
    1-Visitor
    February 9, 2011
    Hi all,



    I have always hacked my way through getting projected area measurements
    for injection molded parts. Is there a slick method? I remember using
    a surf cut feature that used the silhouette of the part - I wonder if
    there is a way to use that tool...



    How do you do this?



    Thanks...



    -Nate

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    P
    ptc-19327451-Visitor
    1-Visitor
    February 9, 2011
    I also use PVA (plan view area) calculations for my forged parts.



    I use TDO (tool design option) to activate the functions to get a
    silhouette curve on the model (normally used to calculate parting lines)



    Then, on any flat plane normal to the direction of pull use edit-fill to
    sketch a flat surface.

    In sketcher select the silhouette curve and use the 'create entity from
    edge' command (looks like a cube with a highlighted edge) and select the
    silhouette curve.

    Make sure the sketch is closed and not over lapping. Close the sketch

    The system will make a flat 2D surface representation of the PVA.

    Use normal measure commands to measure this area.



    Although this works, and I find that the silhouette feature is robust,
    but the sketch 'create entity from edge' command is dumb and will fail
    with changes to the number of edges, etc...





    Christopher F. Gosnell



    FPD Company

    124 Hidden Valley Road

    McMurray, PA 15317
    S
    scooke1-Visitor
    1-Visitor
    February 10, 2011


    Hi Nathan



    You can use the functionality in measure although for some strange reason it
    always slightly over estimates it. (In this example the area is
    actually15000 mm2)



    Very quick and easy if you don't want an exact measurement! You can also use
    "view plane" or "Coord sys" to give the projection



    Regards



    Steve



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