topic Re: Union issue in AutoCAD Forum

Union issue

Anonymous — Mon, 28 Nov 2016 10:28:48 GMT

Hi there. Im relatively new to using autocad as ive only just learnt the basics with this free trial.

I've always used union to join together solids and the seperating lines always disappeared between objects. This time however there is a line that will not disappear between two objects that I have unioned.

I have attached a picture showing the line that i cant seem to get rid of.

Thanks

Re: Union issue

imadHabash — Mon, 28 Nov 2016 11:01:27 GMT

Hi,

I suggest to use Solidedit (Clean) command and choose solid options (Face/Edge/Body)

Command: SOLIDEDIT
Solids editing automatic checking: SOLIDCHECK=1
Enter a solids editing option [Face/Edge/Body/Undo/eXit] <eXit>: b
Enter a body editing option
[Imprint/seParate solids/Shell/cLean/Check/Undo/eXit] <eXit>:

or you can reach it from ribbon as attached image

Good Luck..

Re: Union issue

Kent1Cooper — Mon, 28 Nov 2016 14:08:11 GMT

Welcome to these Forums!

I would assume that the two pieces did not align exactly, but had some slight offset in plane, or perhaps did not meet exactly, but had a tiny gap between them. It's hard to say without either Zooming in much closer or if you can post the "before" drawing file [even just the two pieces, without all the other stuff].

Re: Union issue

eduardovbonfim — Thu, 13 Dec 2018 14:49:29 GMT

Hi this solution didn´t work for me, still , im having issues with a redundant line in my solid, i´ve tried to push and pull or to subtract the area and union again, but none of those worked.

Its attached a image of my solid

Re: Union issue

neaton — Thu, 13 Dec 2018 15:00:43 GMT

Did you try @imadHabash and @Kent1Cooper suggestions? Can you post your dwg file? An image file doesn't help much in this situation.

Nancy

@eduardovbonfim wrote:

Hi this solution didn´t work for me, still , im having issues with a redundant line in my solid, i´ve tried to push and pull or to subtract the area and union again, but none of those worked.

Its attached a image of my solid

Re: Union issue

eduardovbonfim — Thu, 13 Dec 2018 15:08:51 GMT

Hi, yes i´ve tryed but none of them worked for me, but i found a solution myself, by creating a mold of the 3d using subtract function, and them creating a new 3d using the mold i made before, so the redudant line has gone.

Thanks!

Re: Union issue

Anonymous — Thu, 13 Dec 2018 15:46:30 GMT

If Union has worked every other time, then something is different this time.

If lines exist then you know the solids are either misaligned or the dimensions of the solids are not truly equal. While alignment is easy to verify, dimensions are more subtle in that they may report as being the same but may actually be different by a small amount. Take care that when you create the solids, they have the same dimensions.

The "SLICE" command can be used to get rid of the lines.

Re: Union issue

wpotgieter — Mon, 31 Jan 2022 07:12:21 GMT

AutoCAD 3d definitly have a issue with the joining lines, I have the same problem sometimes and it doesnt matter how well I align my ucs.

Re: Union issue

Alfred.NESWADBA — Mon, 31 Jan 2022 10:10:36 GMT

Hi,

>> AutoCAD 3d definitly have a issue with the joining lines

Please upload your drawing with the 2 lines not joining so we can see where AutoCAD has issues.

- alfred -

Re: Union issue

wpotgieter — Mon, 31 Jan 2022 10:25:16 GMT

Its on the Magenta part.

Re: Union issue

Alfred.NESWADBA — Mon, 31 Jan 2022 10:28:12 GMT

Hi,

>> Its on the Magenta part

No file to look into...

- alfred -

Re: Union issue

wpotgieter — Mon, 31 Jan 2022 10:29:38 GMT

It's on the magenta part

Re: Union issue

Alfred.NESWADBA — Mon, 31 Jan 2022 10:37:22 GMT

Hi,

you mentioned "joining lines has issues" ... your drawing only contains one line (other object types exist, but no second line to be used to join 2 lines). So which 2 lines do you try to join?

Important for your drawing general: Your coordinates are outside any valid coordinate system, as you can see here:

Moving your geometry more close to 0,0,0 would result in

more accurate display
more accurate calculations (line object snap, intersection points, offset objects ...)
valid for beeing on earth (if these should be geographic coordinates)

- alfred -

Re: Union issue

wpotgieter — Mon, 31 Jan 2022 11:33:38 GMT

I joined this part of a head wall to the rest. The press/pull function refused to work also the normal Extrude so I ended up lofting it. It did join but the joint line remain.

I traced it from a coordinated scan so I wanted to keep the position so that I can insert it to coordinates in my layout drawing.

Thanks for your concern.

Re: Union issue

Alfred.NESWADBA — Mon, 31 Jan 2022 11:51:27 GMT

Hi,

>> I traced it from a coordinated scan so I wanted to

>> keep the position

Then store a line inside your dwg on a frozen layer, from the center of your geometry to the origin (0,0,0). This gives you the chance to move it back after your work.

To the coordinates, not sure why your scanner returns values like Y = -3.25*10^9 Millimeter, for me that does not make sense, but shown the way above you could save this vector.

>> The press/pull function refused to work also

Please try with normal coordinates again.

>> It did join but the joint line remain

"it did join" ... are you referring to command _UNION or command _JOIN? Because 3D-Solids can't be joined).

If you speak about command _UNION, then sorry, command _UNION has nothing to do with lines, it does not create lines and so a line could not remain if you have not created it.

So back to .. what do I understand wrong about "AutoCAD 3d definitly have a issue with the joining lines"?

- alfred -

Re: Union issue

Alfred.NESWADBA — Mon, 31 Jan 2022 11:53:08 GMT

Additional information ... Moved all parts close to 0,0,0 ... run command _UNION and was able to union all existing 3D-Solids (if that was the question).

- alfred -