always problem with double exploding a solid

[Anonymous]

I am drawing different parts of an apparatus and very often I need to make changes to the solid objects. (making or changing the holes, etc). What i do is exploding the solid object and then exploding the region. but when I make my desired changes, and try to create regions,autocad says "open objects must be coplanar". Even without making any changes to the lines, I get the same error. 

they have been coplanar! what has happened during explosion? 

moreover, when I see the properties of the objects, they all belong to the same plane. 

I have tried Flatten and PEDIT and Join. they sometimes solve the issue and sometimes they are not helpful. Moreover, Flatten changes my circles to ellipses ( actually they are circles but are named ellipse) and I dont want that.

although the Z property of all objects are the same, I tried to confirm that they are the same using Property Editor. that helped me create regions but the regions were such that I could not subtract them, meaning that something is not correct.

Please help me find the source of this problem and don't introduce workaround solutions. 

I have attached a screencast:

thank you

Screencast will be displayed here after you click Post.

4d19b6db-1580-43ad-8a2a-eb267f7d8a08

[pendean]

Why are you exploding the solid objects just to add or change holes?
Post your DWG file please.

[Anonymous]

I understand your frustration, I've experienced it myself. Often though I've found I don't really need to explode a solid into it's component parts. A few years ago I graduated from r14 (not 2014)  which required frequently exploding solids to edit. When I discovered the SolidEdit commend it relieved a lot of the problems associated with exploding. If you don't use SolidEdit give it a try. It's not what I would call a work-around.

[Anonymous]

There maybe many reasons for working in 2-d. In this case I need to change the hole at the top right of the white object to accommodate the red object with some desired clearance. It's much easier in 2-d.

The file is attached here.

[Anonymous]

Thanks for introducing Solidedit. I was not familiar with this command. I tried to take advantage of this command for my currect drawing but I couldn't use it for this purpose. I wrote in my other post what I need to do in my drawing and I attached the file. 

[Anonymous · Accepted solution]

For something like resizing a hole you would use the Face option then select the hole wall, then Offset. If you haven't used it in the past it takes a little getting used to but I'm sure you'll conquer it with practice.

Another approach I still use at times is filling holes with a solid by unioning then recreating the properly sized hole and subtracting. Mostly I try to avoid completely exploding the solid.

[Anonymous]

That was a good answer to my troubles. Meaning that I'd better stay away from exploding as much as I can.‎ 

In the past hour I tried Solidedit and It seems it is an easy way for some modifications.

I am also used to take the second approach you mentioned for some situations. 

Thanks again for sharing your knowledge

[Anonymous]

You're welcome. One reason I like AutoCAD so much is the numerous ways to get things done. Sometimes it takes a little imagination.

[leeminardi]

As others have said I would avoid exploding a solid but if I did I would think about how to use surfsculpt to recreate a solid after editing the surfaces.

For your task I would set the UCS to the top of the white surface then add a circle on the red piece's edge.  Then create an offset and build a shape something like this:

Extrude the shape and then subtract it from the white plate yielding: