Goodbye origin

Discussion in 'SolidWorks' started by Art Woodbury, Aug 8, 2003.

  1. Art Woodbury

    Art Woodbury Guest

    Well, I found a new way to break a part, playing with Insert>Features>Shape.

    Try this: Sketch a rectangle on the Front plane, extrude back to form a
    solid whose front face is coincident with the origin. Invoke the Shape
    command, select the front face to shape and then select the part origin as
    an item to constrain to. Adjust some of the option sliders to get an
    arbitrary shape. Finish the command.

    Notice that the origin has left its usual place near the top of the feature
    tree and is now consumed in the shape feature as if it were an ordinary
    sketch. This should be a warning that all is not well. But wait, there's
    more.

    Delete the shape feature and check the box to also delete absorbed features.
    After the feature is gone, so is the origin!

    In this simple case, there are no warnings at all. But I first found this in
    a part with 20+ features, many of which were constrained in some way to the
    part origin. When I deleted the shape feature and the origin, the feature
    tree lit up with red cherries that got my attention so I was able to undo
    the delete and get the origin back. But if I had saved the part with errors,
    it would have been toast.

    This one's already on the way to SW Corp. via Computer-Aided Products, in my
    opinion the best VAR in this arm of the galaxy.

    Art Woodbury
     
    Art Woodbury, Aug 8, 2003
    #1
  2. Art Woodbury

    Andrew Troup Guest

    Another way to get the part origin to move (not in the feature tree, but in
    3D space) is to use "Tools/Sketch Tools/Align/Sketch"
    If the sketch (typically an imported or copied sketch) is not fully
    unconstrained when you invoke this command to try to align
    the sketch with the part origin, it will sometimes move the (grey) part
    origin AWAY from the intersection of the three default construction planes,
    so it lines up with the sketch entity point, rather than the other way
    around.

    This is pretty scary. I am not talking about the sketch origin moving, that
    is trivial.

    Align Sketch (NOT modify sketch) is a pretty powerful command, which can
    also move a sketch whose elements are all fixed. This can be mighty handy,
    but I am reluctant to use it until they fix the moving part origin problem.

    So far, SldWks have not acknowledged that it IS a problem, but I will try
    again.
     
    Andrew Troup, Aug 9, 2003
    #2
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