While I am running OpenRail 2021 R1, this is just linework.
Is there a way, either a dgnlib edit, or a vba function, that would allow me to input, for example "d10" instead of converting to radius in "circular fillet"?
I know I can do it with geometry, but when doing quick concepts, it is quicker to just use dumb lines
Peter Violette said:I am running OpenRail 2021
There's a Forum just for you! Move your post there, using the More=>Move button.
Or, describe more verbosely what you mean by input "d10" instead of converting to radius in "circular fillet". What is 'd10'?
Regards, Jon Summers LA Solutions
That's a 10 degree curve in chord definition. In OpenRoad/OpenRail, using civil geometry, you can create curves by just defining their degree of curvature by adding "d" in front of your desired degree. Using "create circular fillet" in Microstation, I have to convert it to radius, so I have to input 573.6857' instead of "d10" to draw a 10 degree curve.
The reason I didn't post in OpenRail is due to this not being an OpenRail question, it is just basic Microstation linework.
I have actually never heard of Versine. Quick search and it looks like it is used in someway to lay out curves on rail, so there is some relationship there. I don't have the time at the moment to dive in and really go at it though.
The equations between radius and DOC (degree of curvature) is pretty simple: R=50/(sin(D/2)) where R is radius in feet and D is degree of curvature.
I have never created custom tools in Microstation, but with my limited knowledge, it would seem this is an example of a good use for one if "Construct Circular Fillet" is not capable of a DOC input.
Peter Violette said:The equations between radius and DOC (degree of curvature) is pretty simple: R=50/(sin(D/2)) where R is radius in feet and D is degree of curvature
Thanks for clarifying! So when you write 'd10' does that mean R=50/(sin(10/2))?
Peter Violette said:I have actually never heard of Versine
Versine. It's certainly in use at Network Rail. But I see that you use feet, so presumably you're in the US.
Jon Summers said:But I see that you use feet, so presumably you're in the US.
Oh yes. I am in the land of "freedom units".
Jon Summers said:So when you write 'd10' does that mean R=50/(sin(10/2))?
Exactly. Should get 573.6857'
Peter Violette said:D10 = a 10 degree curve in chord definition
Is there a fixed number of DXX values, or is it arbitrary? That is, do you write D5, D10, D15... or can you specify, for example, D17?
Arbitrary. Can be whatever you'd like, though the majority of the time they are kept to increments of 15 minutes. Attached is the table we use.
DOC To Rad.xls
Couple things. Does not rail degree of curve and road degree of curve differ? Never designed any rails, but I assume most any curve has transitions or spirals at both ends. Though not exact, I think for simple conceptual linework you'd be better off just remembering the radius for a 1° curve then allowing the dialog to "do the math" using the radius field. But I would think OpenRail software would incorporate just such a tool as you describe to help with preliminary/conceptual design.
Connect r16 10.16.03.11 self-employed
Bob Rayner said:rail degree of curve and road degree of curve diffe
Just the difference between arc and chord curve definition.
Bob Rayner said:curve has transitions or spirals at both ends
On mainline track, yes. Yards usually don't due to such slow speeds.
Bob Rayner said:OpenRail software would incorporate just such a tool as you describe to help with preliminary/conceptual design.
When creating geometry, yes. Doing just basic linework, not as far as I know