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.

     




    t2401

    Mirror the profile


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

     

    t2402

    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.

     



    t2403

    Parallel Plane


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

     

    t2404

    Included Sketch


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

     

    t2406

    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.

     

    t2405

    More Arcs


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

     

    t2407

    The Overall View


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

    t2408

    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.

     





    t2409

    BlueSurf Appears


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

     

    t2410

    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]

     





    t2411

    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.

     



    t2413

    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.

     





    t2412

    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.






    t2414

     

    Project Curve - Body Step


    Select the Bluesurf as the surface to project on.

     

    t2415

    Project Curve - Direction Step


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

     

    t2416

    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.


    t2417

    Trim Surface - Surface Step


    Select the Trim Surface trimsurf   tool from the Surfacing toolbar.


    Select the Bluesurf as the surface to trim.

     


    t2418

    Trim Surface - Surface Step


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


    Select the Bluesurf as the surface to trim.

     



    t2418[4]

    Trim Surface - Curve Step


    Select the projected curves as the trimming curves.


    Click accept   accept[12]   on the ribbon bar.

     


    t2419

    Trim Surface - Side Step


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

     

    t2420

    Surface Trimmed


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

     

    t2421

    Normal Plane


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

     

    t0416

    Specify the Curve


    Select the goggle frame curve as shown in figure.

     

    t2422

    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.

     

    t2423

    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.

     


    t2424

    Sweep


    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.

     




    t2425

    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.

     






    t2426

    The Ear Rest


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

     

    t2427

    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.

     



    t2428

    EarRest - Front View


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

     

    t2429

    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.

     

    t2430

    Cross Curve


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

     

    t0103

    First Curve


    Select the front view curve as the first curve.


    Click accept   accept[14]   on the ribbon bar.

     



    t2431

    Second Curve


    Select the top view curve as the second curve.


    Click accept   accept[16]   on the ribbon bar.

     



    t2432

    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.

     




    t2433

    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.

     




    t2434

    Bounded Surface Done


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

     

    t2435

    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.

     





    t2436

    Surface to Solid Done


    This makes it a solid.

     

    t2427[4]

    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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    t2400[4]