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self-intersecting surface

Question asked by John Kreutzberger on Mar 24, 2009
Latest reply on Apr 4, 2009 by John Kreutzberger
This may be more pertinent to the mold design forum, but is a surfacing issue. I have an imported part that I doing a core/cavity split for. I kind of use the mold tools, but not completely. I have all of my knit surfaces for core, cavity and parting surfces in the part file but for a few reasons that are not relevant to my problem I choose to do my split in the context of an assembly.

I create my core and cavity blocks in this new assembly-then bring in the molded part and position it. I then edit the core and copy the core surface and the parting surface; knit them together and do my surface cut. No problems.

Then when I try to do a similar thing for the cavity, I get an error message when I try to offset the cavity surface by a distance of zero: resultant body is a self-intersecting surface. News to me. I go back to the part and look it over and find no problems. Then I try to offset that same surface in the part file-just for grins. No problem-no error message-everything looks fine.

I go back to the assembly and edit the cavity part and try to offset either one of these surfaces with no success. Anybody have any ideas on what is going on? A body check shows no problems, by the way.