Alignment Grid Editor

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Introduction

Use this command to edit an Alignment in a Grid Format.  This command can be used to change the Alignment geometry in the drawing.  This form is modeless - users can freely move around and undertake AutoCAD commands in the drawing, with this form showing on screen.

Once open, users can edit and zoom to different Alignments (using the dropdown or the picker button)as well as optionally set the Speed Table and Start Station/Station.  The PVI's (PVI's) are listed in the per row in the form with the curve and spiral attributes noted accross the columns.  Once the Speed Table is set, the Minimum Radius and Spiral Lengths will be listed for any PVI/PI with a Radius assigned and values that are below the minumum are highlighted.     

Users can edit the following columns:

• Radius: a filleted Bend (Curve) is assigned to the two Straights (Tangents) that meet at the PVI/PI you are editing.  The Bend automatically maintains tangency and cannot overlap the station/station, Bend or Spiral extents of another PVI/PI;
• Spiral (Length) In: Creates a Spiral on the lower station/station side of the PVI/PI you are editing.  The Spiral will automatically transition from the straight (tangent) portion of the Alignment into the Bend (curve) portion;
• Spiral (Length) Out: Creates a Spiral on the higher station/station side of the PVI/PI you are editing.  The Spiral will automatically transition from the Bend (curve) portion of the Alignment into the straight (tangent) portion.

User entries are detailed below.

Use the Windows Close button (x at the top right) to close the form.

Notes:

• After making a Grid entry or moving the Alignment via Grip or Edit Alignment form, click the Refresh button:
• Entries that cannot be solved will return to their original value.

Details

Upon selecting the command the following form is displayed:

Alignment (picklist)	Select the alignment to edit.
	Click here to select the alignment to edit from the drawing.
	Opens the Speed Table form. Note: once Speeds are set, the Min, Radius and Min, Spiral Length will highlight design issues.
	Zooms to the highlight row (users must click on the cell in the first column to highlight the row).
	Update the alignment geometry details.
	Creates a table of the geometry as listed.  Click in the drawing to position the table.
[Alignment PVI List]	Table controlling the alignment PVI/PI points
> First Column	Use this to select and highlight a row
PVI	Displays the PVI/PI numbers, in order of station/station
Station	Displays the station/station of the PVI/PI (non editable)
X	Displays the X coordinate.
Y	Displays the Y coordinate.
Radius	Entry for the Curve Radius.
Min. Radius	Display for the Minimum Radius based on the assigned Speed Table.
Spiral In	Entry for the Length of the Spiral into the PVI/PI's Curve.
Spiral Out	Entry for the Length of the Spiral out from the PVI/PI's Curve.
Min. Spiral Length	Displays the Minimum Spiral Length as set by the assigned Speed Table.
Hand	Displays which side of the Alignment the Curve turns.
Details	Table controlling the Alignment PVI/PI points.
Start Station	Entry for the Start Station/Station of the alignment.
Set	Click to set the Start Station/Station.
End Station	Displays the End Station/Station of the alignment.

Refresh the form to update the values and the line work in the Plan View and Close the form when finished editing.