09 Laterals

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    PowerSHAPE 9. Surface from Curves

    9. Surface from Curves

    CurvesA curve can be defined as a continuous profile of lines, arcs or curves that contains at least

    two points. They can be 2 or 3D as the following illustrations show, and they can be open or

    closed.

    Once a surface is generated, the curves used are called laterals. A closed lateral has a curve

    from the last point to the first point. A surface must contain 2 or more laterals. Once the

    laterals are defined, the surface is filled in between the laterals. Each point number on each

    lateral is joined up together by the smoothest curve, which means that each lateral should

    have the same number of points on it.

    The curve that joins each point on the laterals together to create the surface is known as a

    longitudinal.

    ExampleCreate the following surface with 5 curves.

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    9. Surface from Curves PowerSHAPE

    Create a workplane at 0 0 0.

    Create a line from the workplane, 10mm inY, 10mm in X, and 10mm in -Y

    to produce the 'n-shape'

    This section will be the basic for the other sections so it will be

    copied up the Z-axis as individual lines.

    Select the three lines and then the Copy icon.

    Enter2 for the number of copies and the value of0 0 5 in the position

    window, giving you three laterals.

    Each set

    of lines

    will be

    filleted by

    a different

    radius.

    Create a fillet radius of1mm on the bottom lines, at each corner.

    Create a fillet radius of2mm on the middle lateral, at each corner.

    Create a fillet radius of3mm on the top lateral, at each corner.

    Each shape needs to be turned into a composite curve before a

    surface can be made.

    Select create a composite curve icon.

    Select the bottom lines and then the Save button.

    Select the middle lines and then the Save button.

    Select the top lines, and then the Save button and the Eject button to

    finish.

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    PowerSHAPE 9. Surface from Curves

    Select the lower composite curve and copy it up the Z-axis by 20mm.

    Select the second from bottom composite curve and copy it up the Z-axis

    by 10mm.

    All of the shapes have been turned into composite curves, ready for

    surface generation. Each of the composite curves will be turned into a

    lateral on the surface.

    Select all of the composite curves.

    Select the surface from separate curves icon.

    This form allows you to try different options of

    joining the laterals together with a very useful

    Preview setting. The default option gives a

    smooth result, but if a different surface is

    required other options can be tried.

    Accept the form and the surface is complete.

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    9. Surface from Curves PowerSHAPE

    Pump Project Example.continuedUsing the pump example we can use the two curves to make a surface from laterals.

    Open the model pump-project2.

    Blank all apart from the two long curves either side of the model.

    With these curves selected apply Createsurface from separate curves. Save the model.

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