topic Arc joining to polyline in AutoCAD Forum

Arc joining to polyline

Anonymous — Thu, 14 May 2020 11:20:48 GMT

Everytime I try to join some arcs together to create a closed object, Autocad join them in a spline and not in a polyline made of arcs. It may be caused by that a lot of these arcs are tangent to the neighbour arcs? How can i solve this?

Thanks for the support.

Re: Arc joining to polyline

imadHabash — Thu, 14 May 2020 11:32:46 GMT

Hi,

it supposed from PEDIT / JOIN commands to convert to polyline as i have here .

Command: PEDIT
Select polyline or [Multiple]: m
Select objects: Specify opposite corner: 3 found

Select objects:
Convert Lines, Arcs and Splines to polylines [Yes/No]? <Y>

Enter an option [Close/Open/Join/Width/Fit/Spline/Decurve/Ltype gen/Reverse/Undo]: j

Join Type = Extend
Enter fuzz distance or [Jointype] <0.0000>:

EDIT : Make sure that you don't have any arc item as a SPLINE because if you have any spline object while joining then you will have a spline CAD item .

Re: Arc joining to polyline

imadHabash — Thu, 14 May 2020 11:35:35 GMT

also you can by SPLINEDIT command , convert your spline to polyline .

Re: Arc joining to polyline

Kent1Cooper — Thu, 14 May 2020 11:43:34 GMT

I agree with @imadHabash that if the result is a Spline, one possible reason is at least one of the "arcs" is really a Spline. Another possibility is that the Arcs, though their ends meet, do not lie in the same plane. If that's the case, PEDIT's Join option will not work, anyway.

Re: Arc joining to polyline

Anonymous — Thu, 14 May 2020 12:01:23 GMT

Thanks @Kent1Cooper and @imadHabash for the fast answer. I tried the @imadHabash methos and I ended up with not being able to join some pieces because, like @Kent1Cooper said, they're not in the same plane. I'll attach the result to this reply. The problem is that these polylines have the same elevation. Should I do a workaround with the PROJECTGEOMETRY?

EDIT: Even with FLATTEN, the FILLET command doesn't work

Re: Arc joining to polyline

imadHabash — Thu, 14 May 2020 12:19:26 GMT

i suggest in your case to try BPOLY command to create a closed polyline .

Re: Arc joining to polyline

Kent1Cooper — Thu, 14 May 2020 12:48:13 GMT

@Anonymous wrote:

.... The problem is that these polylines have the same elevation. ....

They won't join because they do not all have the same extrusion direction. The Z-axis direction for some of them is down into the page rather than up off the page. The BOUNDARY method is certainly easier than any other way of fixing that.