Sketch with splines will not cut. swx2006sp5

I have a profile taken from a casting that has a few splines, and I want to wire some parts with it. I get an error "Operation failed due to geometric condition" The profile makes a loop and the continuity of it seems fine since chain select works, offsetting the loop works, and chain select of the offset loop works. If I try to cut with the offset or the original profile, same results. I suppose this is a bug, but any ideas on a workaround??

Thanks, Bill

Reply to
bill allemann
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Bill,

Try to extrude the sketch as a surface... and see what that does,.. is it made up of multiple bodies or one body? If one body, try to cut using that surface body,... what happens? If multiple bodies, try to knit(?) and cut,.. what happens?

My guess is it's a bug but maybe a face your bisecting which gives a zero thickness?

..

Reply to
Paul Salvador

You know, I think it was the zero thickness thing. I was doing a Combine->Subtract with a casting model and something in that geometry must have been causing it. I changed the offset value on the extrude profile and I suppose I then missed whatever the culprit was. The extrude profile is used for cuts to make the parts slightly smaller than the casting. When splines and offsets are involved, swx gets really bogged down and flakey. Sure wish swx would give some clue what the problem is. "Geometry Error" sounds like a string the programmer uses instead of "unknown error".

I'm mostly a machine and fixture designer, so all the ambiguity in splines, surfaces, etc kind of drives me (to distraction).

In this case, I need to make a form fitting nest on one side of a casting, and a form fitting stripper for the other. Some of the contact surfaces will later be whittled away manually to simplify. I've been trying to make this by subtracting the casting from a solid, but do you suppose it could be easier to do the two pieces like a mold, with the cavity and parting line split features?

Thanks a lot for your help, Paul

Bill

Reply to
bill allemann

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