Add a free reverse spiral-curve-spiral-spiral-curve-spiral group between two tangents that are nearly parallel.
This group consists of two successive spiral-curve-spiral groups in opposing directions. When the attachment tangents (1, 2) are edited, the curve radii (4, 7) and spiral lengths (3, 5, 6, 8) do not change. The attachment points and the curve lengths adjust to accommodate edits to the attachment tangents.
You cannot grip edit the reverse SCSSCS group, but you can edit the tangents to which it is attached. You can edit the spiral or curve parameters directly in either the Alignment Layout Parameters dialog box or the Alignment Entities vista.
To add a free reverse spiral-curve-spiral-spiral-curve-spiral between two tangents
- Click the alignment. Click Alignment tab
Modify panelGeometry Editor
. - On the Alignment Layout Tools toolbar, click
Free Reverse Spiral-Curve-Spiral-Spiral-Curve-Spiral (Between Two Tangents). - Select the tangent (the First Entity) from which you want to add the curve group.
- Select the tangent (the Next Entity) to which you want to add the curve group.
- Specify the length or A value of the first spiral (the spiral in).
- Specify a radius for the first curve, or enter D to specify the degree of curvature.
NoteTo calculate the radius or degree of curvature using other known curve parameters, enter 'CCALC to open the Curve Calculator. For more information, see Calculating Curve Parameters.
- Specify the length or A value of the second spiral (the spiral out).
- Specify the length or A value of the third spiral (the spiral in).
- Specify a radius for the second curve, or enter D to specify the degree of curvature.
- Specify the length or A value of the fourth spiral (the spiral out).
- Enter a second parameter for one of the curves.
You can specify a start point on a tangent, subtended angle, or pass-through point. Enter C to switch the curve for which you will enter the parameter.