Sweep command

[Anonymous]

Using sweep I receive this error message:

Cannot sweep or extrude a self-intersecting curve.
1 object removed from selection set.

The polyline is correct, I checked!

This only happens when I copy the polyline to another drawing!

[Alfred.NESWADBA]

Hi,

>> The polyline is correct, I checked!

Show it to us.

- alfred -

[Anonymous]

FYI

[Alfred.NESWADBA]

Hi,

what am I doing different than you? I guess I miss some information about which polyline you want to sweep as well as the path...

Drawing a simple line as path I can sweep both of your polylines.

- alfred -

[Anonymous]

Hi! I follow exactly the same steps! But I recive error about "self intersecting polyline"! I think my version is hunted! I been using this software for 12 years and everday there is some bugg! Thanks for trying anyway!

[Alfred.NESWADBA]

Hi,

>> my version is hunted

Well, I don't know what your version is, and which service pack is installed, maybe it makes sense to look into that...

>> everday there is some bug

I can only say with the newest (current) version of AutoCAD I don't see a bug with your drawing and command _SWEEP 🙂

- alfred -

[Anonymous]

I send you the alignment and the section! Try this one please! Best regards!

[Alfred.NESWADBA · Accepted solution]

Hi,

your issue seems to be the high coordinates position!

You can do either of these:

• move the profile (closed polyline) to 0,0 ==> then the command _SWEEP can use it
• run command _BPOLY and let create a new polyline from your existing profile, then use the new polyline for sweeping.

HTH, - alfred -

[swieciakpawel]

Alfred Got it!

Kind Regards,
Pawel

[Anonymous]

I did as you said and it worked! How did you figure it out about "high coordinates position"? I had to move everthing to 0,0 and ran the sweep! Then I moved all back to correct coordinate! Thanks!

[Alfred.NESWADBA]

Hi,

>> How did you figure it out about "high coordinates position"

I compared your first drawing with the last one 😉

And high coordinates is always a bit critical whenever exact vector calculations have to be done in AutoCAD.

Good to know it works now for you!

- alfred -

[Anonymous]

Another issue is the trim command! I want the hole just on one side of the tunnel but it goes all the way!

[Alfred.NESWADBA]

Hi,

please create new threads for new questions 😉

>> I want the hole just on one side of the tunnel but it goes all the way!

IMHO a trim command goes through the complete object and that can't be avoided.

Why would it be difficult to handle that ... look to that sample (cylinder cuts through wave-surface multiple times) 😉

In your case an option might be to split your tunnel into a left and a right side (already before sweeping create a right and a left profile).

- alfred -

[Anonymous]

thanks for the solution. I had the same problem and It seems that moving objects close to the WCS ( world coordinate system) solved the problem.

If you use command trim or sweep and some similar commands that as you said they need complex math, You will realize that autocad can no longer process your math accurately because you are now having issues with trim (for example). My question is that if I dont use those certain commands and keep going, I will not be aware that I am going beyond lines of autocad. I might have passed the lines some earlier. Now can I trust the drawings and the math I have performed some while before I reach the poing that trim command propmts me that I am too far from origin. Or should I doubt the drawings i have made during the past hour?