Shell Curve - Parallel

Purpose:

To create or modify a shell curve moved in the default surface from another curve or shell profile trace, with a distance along the entire curve that may be constant or vary linearly.

Prerequisites:

None.

Instructions:

• In create mode, the user must indicate an existing curve. Any curve already selected will be used as input to this function. The distance (in the surface) from this curve to the parallel one is entered in the Distance field. If the curve is to be moved different distances at the different ends, the second distance is entered in the Distance 2 field. In this case, Direction has to be set to tell which of the ends the different distances are valid for.

  For example, with a curve with longitudinal direction, setting the direction to FOR means that the curve is seen as running from the aft end towards the forward end, and Distance refers to the first (aft) end and Distance 2 refers to the last (forward) end of the curve.

  Method defines what method to use when measuring the distance between the curves. Perp means that the distance is measured along plane curves perpendicular to the original curve, while X, Y and Z implies that the distance is measured in principal plane curves. The excess fields may be set to extend the parallel curve at either end. In special cases where the curve cannot be moved properly, increasing the values of the Tolerance and Iterations fields may help in creating the curve.

• In modify mode, the curve may be changed. Select Type lets the user change the curve into another type (intersection between surface and plane, intersection between surface and general cylinder or combined curve. By use of the button Modify Box the extension of the curve can be changed.

Options:

None available.

Result:

• In create mode, a new shell curve at the given location will be created and selected.

• In modify mode, the selected shell curve will be updated with the new definition data.