Tuesday 10 December 2013

Surface Modeling - A Pair of Goggles

In this tutorial you learn :


  • How to model a Pair of goggles with frame using the BlueSurf command of Solid Edge
  • How to use the project curve command
  • Trimming surfaces in Solid Edge
  • Thicken surfaces to make solids
    It is assumed that you are familiar with the basics of Solid Edge Part modeling.


  • t2400

    Drawing the profile - Front view

    Start with creating a sketch in the the x-z plane.
    Using the Curve   curvtool   tool, create the outline of the goggle frame.

    You may not be able to close the curve.
    So create a straight line joining the two open ends of the curve.

    See the red circled area in figure besides.



    Mirror the profile

    Keep the profile above the x-y plane.
    Mirror it as shown.



    Another Curve in x-y plane

    Draw an arc in the x-y plane as shown in figure.
    Keep the arc symmetric about the y-z plane.

    Keep the arc well behind the mirrored frame curves drawn earlier.



    Parallel Plane

    Create a plane parallel to the x-y plane.
    Keep the plane well above the top rim of the frame.
    See figure.



    Included Sketch

    Sketch an arc on the new plane by using the Include includec   tool in the sketcher environment.



    More Parallel Planes

    Create two more planes parallel to the y-z plane.
    The planes pass through the endpoints of the arc created in last step.



    More Arcs

    Sketch arcs each on the two planes whose end points are well connected to the arcs in the horizontal planes.
    See figure.



    The Overall View

    Overall the four arcs should nicely enclose both the goggle glasses curves.
    See figure.


    The BlueSurf

    Click the BlueSurf   bluesurf   tool on the surfacing toolbar.
    Select the right-side vertical arc and click accept accept   on the ribbon bar.

    Then select the left-side vertical arc.
    Both - correct and incorrect - ways of picking the second arc are shown in figure.
    Pick in the correct way.



    BlueSurf Appears

    Click accept accept[4]   and then Preview.
    A BlueSurf will be created as shown in figure.



    Add a Guide Curve

    Still in the BlueSurf command,
    Click the Add Guide Curves guidcurv   button on the ribbon bar.

    Select the arc as shown and click accept accept[6]



    Add Another Guide Curve

    Similarly, select the other arc as shown in figure.

    Click the accept accept[8] Preview and Finish buttons in that order.



    BlueSurf Created

    A BlueSurf, as shown in figure, is finally created .
    This surface spans the two smaller arcs and is guided by the two larger arcs.

    You could have build the BlueSurf the other way too, in that, the surface spans the two larger arcs and the two smaller arcs act as guide curves.

    This is more commonly done when building a BlueSurf using a set of curves - when the bluesurf fails in one way, it sometimes builds the other way.



    Project Curve - Curve Step

    Make visible the two profiles for the goggle frame.

    Select the Project Curve projcurv   tool from the Surfacing toolbar.

    Select one of the profiles of the goggle frame as the curve to project.

    Click accept   accept[10]   on the ribbon bar.



    Project Curve - Body Step

    Select the Bluesurf as the surface to project on.



    Project Curve - Direction Step

    Point the arrow towards the Bluesurf and click.
    Click Finish on the ribbon bar.



    Project Curve - View It

    Click the Visible and Hidden Edges shadtol2   tool on the Main toolbar to see the projected curve.

    Similarly, project the other frame curve also.


    Trim Surface - Surface Step

    Select the Trim Surface trimsurf   tool from the Surfacing toolbar.

    Select the Bluesurf as the surface to trim.



    Trim Surface - Surface Step

    Select the Trim Surface trimsurf[4]   tool from the Surfacing toolbar.

    Select the Bluesurf as the surface to trim.



    Trim Surface - Curve Step

    Select the projected curves as the trimming curves.

    Click accept   accept[12]   on the ribbon bar.



    Trim Surface - Side Step

    Indicate the arrow pointing away from the frame as the part to trim off.
    See figure.



    Surface Trimmed

    The Bluesurf is trimmed as shown in figure.
    Also, I have applied Steel to it using the Part Painter.



    Normal Plane

    Click on the Plane Normal to Curve tool on the features toolbar.



    Specify the Curve

    Select the goggle frame curve as shown in figure.



    Plane Created

    Click at the end point of the curve as shown in figure in last step.
    The plane is created as seen in figure.



    Sketch the Cross Section

    Sketch a small circle in the newly created plane.
    See Figure.

    This circle is the cross section of the goggle frame.




    create a swept protrusion using the circle as cross section and the projected curve as path.

    Also create the frame for the other frame in the pair.
    Connect the two frame with another swept protrusion along an arc that connects the two frames.
    See figure.



    Surface to Solid

    Click the Thicken   thicken   tool on the Features toolbar.

    The Thicken tool is in the same flyout as the Thin Wall and Thin Region tools.

    Select the Trimmed Bluesurf as the surface to thicken.
    Use a small value of 1 mm to thicken in any direction.
    Using Part Painter, apply White (clear) to the bluesurf.



    The Ear Rest

    Next, we will create the ear-rest for the goggle.



    EarRest - Top View

    This is not a simple protrusion.
    When viewed from the top, the ear-rest is bent at two places.

    First, where the free end goes behind the ears to See figure.



    EarRest - Front View

    Create a sketch in the x-z plane for the front view.
    See figure.



    EarRest - Top View

    Create a sketch in the x-y plane for the top view.
    As shown in figure, align the ends with the extremes of the front view.



    Cross Curve

    Select the Cross Curve command from the Surfacing toolbar as shown.



    First Curve

    Select the front view curve as the first curve.

    Click accept   accept[14]   on the ribbon bar.



    Second Curve

    Select the top view curve as the second curve.

    Click accept   accept[16]   on the ribbon bar.



    Cross Curve

    Click Finish on the ribbon bar.
    Soon the cross curve is formed.

    The cross curve is neither in the top plane nor in the front plane.

    It is bent as pointed in the figure besides.



    Bounded Surface

    Hide all sketches.
    Click the Bounded Surface bondsurf   tool from the Surfacing toolbar.

    Drag a window around the cross curve to select it.
    See figure.



    Bounded Surface Done

    Click accept   accept[18] Preview and Finish in that order.
    A bounded surface will be formed as shown in figure.



    Surface to Solid

    Click the Thicken   thicken[4]   tool on the Features toolbar.

    Select the bounded surface as shown in figure.
    Specify the direction to thicken as shown in figure
    Type a value for the thickness of the fork in the ribbon bar.

    Click Finish on the ribbon bar.



    Surface to Solid Done

    This makes it a solid.



    Assemble It

    Finally, assemble the goggle with the ear rest and its ready to use.

    cMayoCAD is a first of its kind training program where you learn to build your own, brand new, fully functional CAD system using a geometric modeling kernel.



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