draw a road clotoid

[Mtalento72]

Bye to all,
I have to draw a new road route on a catastral map and some parts are in curve. According to local regulations I should generate three different arches with three different curve beams (think is called variable radius or chlotoid curve).

on the net I found many theoretical explanations but I found very little on how to draw them (unless to have civilization 3d).

Is there a method in autocad 2013?

Thank you very much to all.

 

[Tristan]

No, it doesn't exist. but maybe on the net you find some lisp... have you already searched?

 

[Mtalento72]

I saw a little lisp and xls for the calculation but I was hoping for something more immediate since it doesn't seem so exotic.

 

[Cristallo]

Well, a clotoid is basically a fitting curve, which has the characteristic of having variable bending radius at each point. if it is not a geometrically exotic element this...
dedicate the time necessary to design it well (without approximating with fixed radius curves) otherwise you run the risk that the automobilsts of blasphemy behind each passage (or worse that someone finds himself standing in the guard-rail)

 

[PlannerRoad]

I add, that being something delicate as design, as already said crystal,

....(or worse than someone finds themselves swelled in the guard-rail)

I would well evaluate the goodness of a lisp found on the net.
Anyway qui The usual lee mac changed one, but I never tested it.

 

[confutatis]

I had created the clotoid construction program, one of the most challenging programs I wrote a long time ago. problems are more than one: 1) had been created before 2000 and therefore created without the use of vla,vlax,ecc... 2) not being an "external use program to the company" I never worried about making it user-friendly 3) while working in its main lines would be resumed and optimized, perhaps adding the dialog boxes, now completely absent

 

[Granato]

Of course you can...

you have to find the x,y points of the chlotoid with the note forums, maybe you do a table in excel....after that you copy and paste these points into a text editor and create a script file where at the first line write: _

then go to the head and fix the coordinates of the points in this way:

x1,y1
x2,y2 and so on....(Be aware that the coordinates must be separated from the comma and there must be no space)

at this point, move the ucts to the point where the clotoid should start and import the script file....

The clotoid draws you alone

p.s. make sure that the osnapcoord command value is set in such a way that the sripts take precedence over the snaps

 

[Mtalento72]

Of course you can...

you have to find the x,y points of the chlotoid with the note forums, maybe you do a table in excel....after that you copy and paste these points into a text editor and create a script file where at the first line write: _

then go to the head and fix the coordinates of the points in this way:

x1,y1
x2,y2 and so on....(Be aware that the coordinates must be separated from the comma and there must be no space)

at this point, move the ucts to the point where the clotoid should start and import the script file....

The clotoid draws you alone

p.s. make sure that the osnapcoord command value is set in such a way that the sripts take precedence over the snaps

Thank you so much! In fact at the end I solved more or less as you suggested, the only difference I inserted in the excel sheet x,y starting coordinates and the starting corner of the curve not to move the ucts.

 

[Granato]

Well, the bird moves it locally in 2 seconds...:smile:

 

[luipez]

Thank you so much! In fact at the end I solved more or less as you suggested, the only difference I inserted in the excel sheet x,y starting coordinates and the starting corner of the curve not to move the ucts.

would it be possible to have this file?

Thank you.