Hi, I'm trying to create a midsurface model from a ribbed part. I imported the part with the STEP format and it seems to be a good model. It is really simple but when I try to generate the midsuface model ("Insert_Midsurface_Auto Detect"), Pro Mechanica gives the following message "No shell pair have been created or modified".
Are there any settings useful to avoid this kind of problem? Does anyone know what could be the problem? The midsurface model generation doesn't work with this model, maybe some surface let this feature not possible.
Pro/M's midsurface Auto Detect works only with a) Pro/Engineer solid features that b) carry attribute 'Thin' (or thin solids for that matter).
Since you are importing STEP, you are pretty much stuck with the manual surface pairing, in other words, you must manually pick pairs of 'top' and 'bottom' surfaces, and Pro/M will create midsurfaces between them.
Pro/M Help that gets installed along with Pro/M software has a chapter on the above; it's not exactly perfectly written but certainly better than nothing. It also has some explanation how to deal with surfaces that cannot be paired (imagine an L-profile with the fillet on the inside only -- the fillet surface has no pair...).
good STEP models can be converted to Sheetmetal, and then Auto-MidSurface is working. But with a ribbed part, you have to define them manually. But be aware, that the rib surfeces have to be parallel - often I got models where because of better deforming after moulding they where slightly angled - then you have no chance. Sometimes it is simplier (esp. if you want to find "best design"), to delete all special features, and create them native in ProE...
kind regards -
Hartmut PAUL Dipl-Ing. (BA)/BSc. (Hons)(Open) QM-L
RITTAL GmbH & Co. KG Auf dem StÃÂ¼tzelberg D-35745 Herborn Tel.: +49 (02772) 505-2450 Fax : +49 (02772) 505-2600
One trick that probably won't work for your model, but might do for others in future, is to use the sheetmetal conversion facility. Takes a solid model and turns it into sheetmetal. Very useful for peope like me who can;t be bothered to design in thin sheetmetal but knows the basic shape that I need to enclose.
Then Mechanica knows that the geometry is 'thin' and can auto pair the surfaces. But for something with ribs, this probably won't work since you couldn't make it out of sheetmetal
--- David Reid Optima Design Services Ltd firstname.lastname@example.org