Solved: Curve Calculator: Chord Definition

schroederC3D · ‎12-19-2017

Hi All,

I have a quesiton regarding the Curve Calculator tool, and the method by which it calculates the radii given a degree of curvature as input.

The method for calculating the degree of curve that I'm utilizing is:

The issue I'm having is that I seem to be getting different results between Excel and the Curve Calculator tool in Civil 3D.

Using Excel, I have the following formula and results:

And using the Curve Calculator, this is the result:

You'll notice, the radius given by the Curve Calculator above is consistently 1/2 of the the radius calculated using Excel. Does anyone know the formulas used by the Curve Calculator?

Reply Syntax?
Command (Uppercase): TRIM, Variable (Italicized): MSLTSCALE, Civil 3D Object (Within brackets): [SITE]

If this solves your issue or answers your question then please hit the KUDO button or mark as an ACCEPTED SOLUTION!

Please support my Idea to revert the forum format to the old one: https://forums.autodesk.com/t5/community-ideas/revert-to-old-forum-layout/idi-p/7917987

Mike.M.Carlson · ‎12-19-2017

Hello-

I think you have a slightly incorrect formula. Civil 3D uses the following formula:

I hope this helps.

Michael M. Carlson
Senior Civil Designer
CADD Manager
AutoCAD Civil 3D Professional
AutoCAD Professional

schroederC3D · ‎12-19-2017

Thanks Mike - I should have reviewed the formula rather than assuming it was correct.

Reply Syntax?
Command (Uppercase): TRIM, Variable (Italicized): MSLTSCALE, Civil 3D Object (Within brackets): [SITE]

If this solves your issue or answers your question then please hit the KUDO button or mark as an ACCEPTED SOLUTION!

Please support my Idea to revert the forum format to the old one: https://forums.autodesk.com/t5/community-ideas/revert-to-old-forum-layout/idi-p/7917987