Groups of bodies from imported DWG file

[walterlundin]

I have a recurring workflow where I am given a DWG file to be turned into a 3D stamp.  I import the DWG and basically treat it as a sketch, selecting all of the lines/curves, then extruding them into surface bodies.  I then select these bodies and thicken them to create the stamp surface lines.

The problem comes in when I initially extrude the lines - some of them create single bodies, others create multi-surface bodies.  If I try to thicken once of the multi-surface bodies (e.g., like 104-106 in the attached picture), it often blows up with one of about 3 geometry errors.  As a work around, I can select each surface separately and thicken it instead of selecting the entire mult-body.  It would be a lot easier if all of the bodies were separate to begin with - I could select them all from the browser and thicken them together.  Is there a way to break up these groups, or stop them from being created in the extrusion step to begin with?  At first, I thought this was something peculiar to the DWG file, but none of the files I use have polylines, groups, blocks or any other type of multi-elements - it is all simple geometry.  Thanks in advance for any insight.

[TrippyLighting]

You can unstitch a surface e body into the different faces it consists of.

That function is also in the Surface tab under Modify.

[walterlundin]

That doesn't seem to work in my situation.  When I bring in a DWG, the groups I am ending up with are either a single set of connected surfaces, or or collection of several sets of surfaces like Body 53 below.  In neither case can I select the body in the browser when using the unstitch command.  I can click on individual surfaces and unstitch them from the group, but I am dealing with hundreds of them in a typical drawing.

There must be a way of preventing these groups from being created when importing a DWG, or alternatively breaking them up.

[g-andresen]

Hi,

share a file in which this phenomenon occurs.

günther

[TheCADWhisperer]

Can you zip and Attach the original *.dwg file?

[laughingcreek]

edit: opps-wrong thread

[walterlundin]

I'm having trouble with the DWG file, but I've attached the DXF version.   This is my general workflow:

Open a new design & save
Insert the DXF
Change selection filter to Sketch Curves
Select the entire sketch
From the surface tab, Extrude up 5mm
Ideally, here I would like to select all ~450 bodies at once from the browser, then thicken them symmetrically 0.5mm. However, if I select any of the "groups" of bodies that contain more than about 5 surfaces, the thicken command crashes with either a topology error or inconsistent orientation error.

I'm really hoping somebody tells me that my whole workflow is wrong and there is an easier way!

[walterlundin]

See the file attached to my last reply.  Thanks in advance

[TrippyLighting]

When lines are extruded into surfaces those surfaces have a surface normal. This is visible in the viewport through the different colors of the faces.

When you try to stitch the whole non manifold nato of the object into one object, then Fusion 360 encounters problems.

While it definitely should not crash, I personally would not expect for that to work.

You'll  just have to do do a small section where you make sure that you flip the surface normal into a common direction before stitching and then thicken. Then you might be able to combine the thickened pieces.

Edit: Looking closer at this design, there are a number of double extrusion resulting from overlapping lines.

This is likely the reason Fusion 360 crashes. If you'll remove those from the sketch then this will likely work much better 😉