Can't keep elements joined. When creating viod form

[Anonymous]

I have had this error on occasion and it throws, what I thought would be a quick model exercise into a long ordeal... trying to work around these little errors...

This last time I received this error... I created a sweep form... then tried to cut a shape of the end to get my final form... and... error again...

Is this a common thing... is there something I may be doing to cause this... I have attached the basic family model that I was working on just with the problem attached...

[Anonymous · Accepted solution]

I looked at your family, presumed it was a Generic family - not that it matters. I elected to resolve your solid and void forms in a different manner (see attached).

Instead of using a sweep, which was unnecessary, I used a solid extrusion in the Front elevation to shape the main part. I copied the sweep profile to the clipboard from your family to my family in a simple extrusion, so I did not have to recreate the sketch lines. To create the void form I again copied to the clipboard your sketch lines and pasted them into my family void form extrusion in the Ref. Level view. I used Reference planes to align and lock sketch lines just in case I needed to make this part parametric in future, but did not assign any labeled dimensions.

I think using a solid form sweep and the Front Elevation work plane made it difficult to use an extruded void form in the Ref. Level work plane to cut the solid form sweep.

Mel Persin, AIA
AEC Technology Consultant
Technology to Visualize and Realize Solutions
Modeling the Future/Drafting the Past

[Anonymous]

Forgot my attachment.

Mel Persin, AIA
AEC Technology Consultant
Technology to Visualize and Realize Solutions
Modeling the Future/Drafting the Past

[Anonymous]

I did wonder if I change to using a extruded form if it would have worked... I was using the sweep because... in the full model I have images overlayed of the objet I am creating in plan and elevations... It is fastest to give the sweep path with a line following the length on the image in plan then draw the profile in elevation... I think you should get the idea...

Using the extruded adds an extra step, but if that is the only way around this error then that is the work around...

Do you think this is a problem with cutting sweeps with an extruded void?

Thanks for looking at this...

[Anonymous]

I have been watching closely my models for this error... and I have been noticing a pattern with the error... I am wondering if it may be an issue that only occurs when I attempt to join or cut solids that were created in a different method... sweep and extrusion... again it is not consistent... sometimes it work no mater which I use... But I seem to have more luck if I keep but items that are created the same type of solid form...

Anyone else have thoughts on this I would love to know I am not the only one seeing this...

Thanks...

[Anonymous]

It has to do with the Work Plane the solid or void form is created many times.

Mel Persin, AIA
AEC Technology Consultant
Technology to Visualize and Realize Solutions
Modeling the Future/Drafting the Past

[Anonymous]

I did have that thought... but I can't argue with the fact that since I have been avoiding the mixing of types of forms... I have not had the error...

And to note... the fix you did to my problem... you changed the form to the same type of form as the one cutting it... and both forms were on different planes...

Just an interesting thought...

It is working for now... I am happy for now... at least with this issue....

[dirk.neethling]

Hello,

I am joining 2 sweeps using

            CombinableElementArray cea = new CombinableElementArray();
            cea.Append(rawSegment);
            cea.Append(joint_bottom);

            GeomCombination combo = doc.CombineElements(cea);

The rawSegment sweep is just a curved solid created with a horizontal plane.

The joint_bottom sweep is created on a slightly slanted plane (see attachment which contains both sweeps but without joining them).

The combination of both of these sweeps fails with the message "Can't keep elements joined".

When I create the joint_bottom sweep on a plane which is parallel to the plane of the other sweep, the combination works.

How can I overcome this problem?

Regards, Dirk

[Anonymous]

Hi Melarch,

I am too had the same issue as ajk-cad. Created from a solid extrusion and void extrusion.

I have attached the file just in case if you want to have a look at it.

Thanks and regards..

[Anonymous]

조금 야매긴 한데, 

스윕이나 돌출이나 상관없는것 같고, 객체가 복잡하든 안복잡하든 이것도 상관없음.

단지 보이드 외부겉면이 절단시킬 객체의 겉면과 어느 부분이라도 맞닿아 있으면 저렇게 됨.

그러므로 보이드의 겉면을 절단시킬 객체의 면 바깥에 위치시켜야됨.

근데 시각적으로 딱 맞게 하고 싶으면 0.01정도만 살짝 바깥에 위치시켜놓고 보이드 만들면 오류 없이 구멍뚫림.

[tobias.vanwestrenen]

Autodesk, please fix. This is core functionality. Amazing bug for such an expensive piece of software. Sorry for not being 'helpfull'. I left out the godverdomme's to be polite like an anglo-american is bound by law or something

[tobias.vanwestrenen]

Ok after a tantrum I found a solution. In my case intersecting void forms were slightly off, like 0.04 mm. For some reason this was for Revit reason to quit coöperating and shout 'Can't keep elements joined !'. What is 0.04mm, deal with it. Whatever