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Catenary Sag Curves with CAT_RSS
Draws a 3000' wide Catenary Curve chart in AutoCAD. Uses differing Horizontal and Vertical scales, Ruling Span and Ruling Span Sag values. This makes a good catenary template for use in checking manual or CAD drawings. Printout suitable for including with construction documents.
Scales Assume Mapping Units of 1 foot = 1 drawing inch
20/200 Size Mapping Drawings use: v0.05/h0.005
Ruling Span Length
Ruling Span Sag
Vertical Scale 1=
Horizontal Scale 1=
Displays List of Extended Entity Data Values
The use of Extended Entity Data attached to an AutoCAD polyline was a result of the need to verify correct use of the Catenary Generators by the drafter. The drafter must satisfy the Engineer that all conditions have been met before he accepts the validity of the electronic data. Output to screen and to text file provides substantiating evidence of conformance to Engineering parameters.
1. (H/W) K Value
2. Vertical Scale
3. Horizontal Scale
4. Point P1a
5. Point P2a
6. Point P3
7. Wind Span Length
8. Conductor Length
9. Back Load Span X1
10. Ahead Load Span X2
Warning about UNITS and Calculations when Loading
When loading 3DCAT.LSP a warning is displayed if the Units setting is other than Decimal  because the formulas used assume whole units as equal to 1 foot. Otherwise curves may not match your original template.
OUTPUT to screen
Display on screen of several Autolisp variable names and their set values after a program function run is available by typing (VALUES) at the Drawing Editors Command: prompt.
Calculations of CAT and 3DCAT saved to ASCII file
The purpose for writing Y3/Sag values to a file was to verify that the results I was getting from 3DCAT.LSP were the same as CAT.LSP. I also have been trying to document my work in the form of an instructional manual with command line prompts and arguments.
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© Copyright 2006 by Robert L. Zipprich. All rights reserved