sweep error message, Unable to create a valid body because ....

[Anonymous]

Hi, everybody!

I have an issue with  sweep .

The file is attached.

When I try to perform sweep my solid is upside down.

When I try to create sweep along the path I choose alignment option “NO”

And then  I receive the following message

Modeling Operation Error:

     Unable to create a valid body because a lateral edge starts off of the profile in the opposite direction of the sweep direction.

Unable to sweep 1 selected objects.

All ideas are appreciated!

Thank you!s

[JDMather]

I think your objective is to learn to use the UCS ZA O options to set your UCS perpendicular to sweep path BEFORE creating profile for the sweep.

[Anonymous]

i too have this issue: in my JPG example,
a wavy (3 arcs) magenta polyline is on the top surface of a triangular base "cut from thick wood sheet"
(base has a red top edge, green bottom edge) - this wavy magenta polyline is my path for sweeping.
My aim was to create a solid ramp down from the magenta path, all maximally sloping in the X direction,
not perpendicular to the path, even if my first drawings anchored the profile orthogonal to the
midpoint of the wavy path - i've tried positioning the profile over the path in different places
in case the start conditions were being misinterpreted.

The small closed red polyline is made of a sharp triangle with a square added to its shortest end.

i cannot sweep this red polyline profile along the magenta wavy path - msg:

Modeling Operation Error:

     Unable to create a valid body because a lateral edge starts off of the profile in the opposite direction of the sweep direction.

But i CAN sweep a triangle, square, rectangle, circle drawn in the same plane as my red polyline,

and i can see the effect of Base point, Alignment options in those profiles...

(my base point is where the square meets the top of the hypotenuse and Alignment is No).
For a laugh, i recreated the closed polyline profile using lines in different directions! - no use.
I can create other bizarre profile shapes from straight lines and sweep those, just not the profile i need...
except I did get some sweeping earlier, but only perpendicular to the path, regardless of Alignment...
i think i smell a UCS issue - but why do other profiles work?!
Help!

[Alfred.NESWADBA]

Hi,

welcome @Anonymous.autodesk.com!

>> in my JPG example

Well, read your description with the point of view of someone who does not have your drawing ... would you be able to understand the situation or give any valid suggestion? And why JPG? We can't check the objects (which type, which size, are the arcs connected to a polyline or to a 2D-polyline or a 3D-polyline or a 2D.polyline that is set to "fit curve" or ..or ...or ...)

Please upload the drawing (DWG-file) ... containing only the parts you are referring to, the path and the object to sweep, nothing else. That might bring us into the situation to support you.

- alfred -

[Anonymous]

Hi Alfred and any others even partly interested...
never thought anyone would respond so fast.
Herewith the isolated problem as an AutoCAD2007 DWG.
Sweep Mode is SOLID.
The Base point is at the end of the cyan line (Layer: 0)
which points at a node on the red Profile (Layer: Profile)
sweep Path is in magenta (Layer: Path).
.
Path is in the same plane as (Layer: Slab top)
Resulting sweep should define a hillside with a fixed unidirectional slope
(Alignment = No), for excavation from the slab.
I just tried again and ONCE (only), it swept, a 90 degree rotated version
of my profile.
Thereafter, the same failure as before.
Any help most welcome.
Nigel

[Alfred.NESWADBA]

Hi,

>> Herewith the isolated problem as an AutoCAD2007 DWG.

No dwg-file attached. Please use the Internet browser to reply to the thread/post. there you can attach files (attachments in mail-reply's are ignored).

- alfred -

[Anonymous]

try # 3...!

here is the AutoCAD2007 DWG authored in AutoCAD2015
showing - i trust - the mysterious failure to sweep.

sorry for inconvenience.
Nigel

[Anonymous]

attached file via forum - hope it appears ok! - tks vm.

[Anonymous]

You may have to create two sweeps ,then union them together. Make the straight line one separate model and the other. Break it at the points. Then if you need to you can fillet the edges. See attached

[Anonymous]

Disregard, was looking at wrong sweep.

With the red polyline that you are trying to sweep along the magenta line, the axis cross over and AutoCAD has a hard time constructing this type of object where the sweep crosses over itself, because of the long ramp you have. May have to create the ramp another way.

[Anonymous]

Attached is an image of how long of a ramp you can have before it starts to give error of axis crossing. If you need to further create it make sure that your path is perpendicular to any intersections. Works better on sweeps.

[Anonymous]

you mean change the profile or change path? Full path works for other
profiles e.g. rectangle, but not such a pointed profile as shown.
Tks...