How do I position CAD models?

[ukoehler]

I'd like to import some STEP models (i.e. from LINOS Photonics) in FRED. Import works well, but I have no idea how to set the coordinate system to some "known" position in the model. I could ask our engineers to import the file in SolidDesigner, move the part corner or its center or to the origin and re-export as STEP or IGES. Is there a simple trick to do the same within FRED?

I do not have access to a full CAD Software with STEP import/export support on my desk. There is a programm "3D-Tool" which might do this for 300€. I asked them for a demo key with STEP support. Is there any other cheap/free CAD Software or conversion utility?

Thanks,
Ulrich

[Photon Engineering]

The best way is when you use FRED's CAD import menu, select the option to import using the Move to Import System Origin to Surface-->Move origin to surface average. This way when you drop an analysis surface onto the object it is placed correctly.

[Photon Engineering]

The product that I would recommend would be Rhino 3D by McNeel and Associates. This product is well priced and does a great CAD conversion to multiple formats, including IGES and STEP. You can even download a trial of the program at http://www.rhino3d.com/. This product, Solidworks and ProEngineer are the three products that have the best import and export to FRED of all the CAD products. Although there are several that come a close second.