@tim said:
QCad was utterly incomprehensible and refused to import the files.
Tim, have you had any more luck in this department?
I've been using QCad for about 5 years now (and have been using Macs for 20+ years). I absolutely love QCad! I do admit that it does choke on certain DXF/DWG files, but I would blame that on Autodesk rather than anyone else. Even some Autodesk apps also have problems opening up ACAD files!! QCad works with R12 type DXF files but nothing else.
QCad cost me about ยฃ14 (about $26 at the time). I used it all the way through my degree- when I was being forced to work with ACAD on PC's. It fooled everyone. My recommendation is to print out the manual, and ring bind the pages. There's nothing like a good absorption of knowledge while sitting on the throne!!
QCad works painlessly with SketchUp, but what makes QCad so nice (although admittedly doesn't look or behave, very 'Mac'- which is also a slight turn off), is that it is both multi-platform, and portable.
You could also try (for reading DWG files), Punch! Software's ViaCAD (which also works with SketchUp), and/or download the latest build of Rhino for Mac. ViaCAD, like ACAD, is ACIS based, and so therefore has little trouble reading DWG files. You can then export back into SU.
BUT, and it's a big BUT, on the whole, generally all CAD software hates its neighbours- which makes it all, such a headache. There is an internationally accepted format called IGES, but again models exported using IGES can also loose geometric data. SpaceClaim excels at importing rogue data, but then is Windows only
We will have to wait for Autodesk to bring ACAD to Mac OS X!
http://www.archdaily.com/19718/autodesk-autocad-for-mac-osx/
regards,
Tom