Intersections of 2 arcs

**David Bethel** · 25th Jul 2012 04:24 pm

Greetings,

1st let me preface this with the fact that I know zilch, nada, nil about solid modeling. But I think the easiest way to accomplish what I'm trying to do is thru solid modeling and export the end result as (3D) polyline

What I have is 2 intersecting arcs with varying radii and ucs values. I'm guessing these could turned into regions and then subtract 1 from the other in order to find a list of intersecting points or maybe a splined pline. Or maybe they could be joined. Either way, if I DXFOUT the solids in R12 format, they become plines

I have access to R14 thru 2012

My attempts at have been very disappointing ( but expected )

Any suggestions would be greatly appreciated. -David

**JD Mather** · 25th Jul 2012 05:23 pm

Originally Posted by David Bethel

I have access to R14 thru 2012

Do you have access to Autodesk Inventor?
Inventor has had this tool for years
Intersecting curve.PNG

Attach your dwg file here - maybe I can figure out something in AutoCAD with xedges.

Oops, I see you did attach the file. Let me see what I can figure out.

**JD Mather** · 25th Jul 2012 05:29 pm

Uhmmm,
list indicates those are arcs with thickness.
Don't do that.
Extrude them as surfaces.
Trim one of the surfaces with the other.
Change active color.
xedges

**David Bethel** · 25th Jul 2012 05:30 pm

Thanks! -David

I did Extrude ( 2 arcs ) -> Union ( 2 surfaces ) -> xedges ( returned (1) spline (4) arcs and (4) lines) Very cool!

**JD Mather** · 25th Jul 2012 05:36 pm

But did you actually get it? That was pretty fast.

**paulmcz** · 25th Jul 2012 05:55 pm

David, I removed the thickness from both arcs, added some polylines to each arc so they both would become closed polylines, extruded both, subtract one from the other and saved as R12 DXF. Then, I open the dxf drawing and saved it as dwg. Attached.

Paul

**JD Mather** · 25th Jul 2012 06:09 pm

Sounds like a lot of extra work?

**paulmcz** · 25th Jul 2012 06:23 pm

You are correct JD. A lot of extra work.

**David Bethel** · 25th Jul 2012 06:44 pm

Originally Posted by JD Mather

But did you actually get it? That was pretty fast.

Yes! it actually worked. I didn't quite expect xedges to make every edge for both solids, but it will be useful to me. Thanks! -David

**David Bethel** · 25th Jul 2012 06:45 pm

Originally Posted by paulmcz

David, I removed the thickness from both arcs, added some polylines to each arc so they both would become closed polylines, extruded both, subtract one from the other and saved as R12 DXF. Then, I open the dxf drawing and saved it as dwg. Attached.

Paul

HHMMMM I'll have to figure what that 1 does. Thanks! -David

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