Push-Pull sometimes won't delete face
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Sorry if this has been asked before, but I had a tough time coming up with a search query that gave a reasonable number of hits.
I often use the push-pull tool to push a portion of a rectangular solid "to nothing". That is, I want to get rid of a section. In the simplest case, imagine a cube created with the rectangle tool, followed by PP. Then use the line tool to draw a diagonal on one face. Now use the PP tool to get rid of that corner - push it to the back, and I expect the whole corner to disappear. It usually does, but sometimes it leaves just a face. I then have to go in and manually erase the 2 extra lines that get left. Why does this happen, and is there a fix? CB.
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ive got a feelign that in some cases you get an extra face that seems to magically appear in this situation. Im not sure of any particular way to solve it, other than to be wary of creating more faces on top of the existing one.
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I know just what you're saying. If the original 2 faces ("front" and "back" of the rectangular solid) aren't exactly parallel, then I would expect this behavior. But I'm positive they're parallel, because they were created with PP in the first place.
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I had a lengthy discussion with Google on this a year or so ago. I don't like the behavior either, as it is inconsistent.
I don't remember what came of it...
but I remember them being interested in it. 
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I understand about severity, and this being low-priority. It doesn't cause a crash! It happens to me frequently, and I just sigh and delete the extra face and surrounding edges. But I was teaching sketchup to a group of 40 members of my Guild when it happened live on screen, and about 10 people shouted out: "why does it do that? It does that to me too!". So I thought I'd consult the experts to see if there was any collective wisdom on the subject. Looks like it's just something we live with for now. CB.
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There always seems to be a limit to the accuracy of the math behind the models. A known example is that SU 2D hidden-line output from any but very small models almost always has some lines missing. I don't know if the inches that lurk there deep within SU make it any easier for a modeller using metric.
Anssi
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If I take a simple cube and inscribe a circle that is tangent to it's sides, and them push/pull to make a void, it leaves a face every time.
If I take the same geometry, but make the circle not tangent, it voids properly.
There's some kind of bug, I think. But I've only started using the program ten minutes ago. I'm good at finding weaknesses very quickly.
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