Why, when mirroring a fully defined sketch entities, does the entire sketch turn OVER DEFINED ????????
My only guess somewhere you have a line that's not true vertical or horizontal and after the mirror SW tries to automatically change the line relationship etc...
Without seeing any sketches or uploaded part it is nigh impossible to help..
I've occasionally seen that happen too. Can you post the file here?
I mirror fully defined sketch geometry all the time, but I have not experienced the problem you are describing. Can you upload a file that has a fully defined sketch that, when mirrored, does what you are talking about? This way we can try it and see if we get the same result.
As I said above, I've had it happen occasionally, but I've had a mirror turn a sketch under-defined more often. Before...
...and after mirroring the arc and line about the vertical construction line.
I have that every time, if I get some time (tomorrow) will upload sketch that when mirrored goes overdefined - but before mirroring is completely fine,.
I don't like the way SW defines symmetry resulting from a mirror. SW constrains line endpoints with symmetry, but does not constrain segments. This can make for some strange results.
If the sketch isn't too large, I take the time to delete symmetry of points and apply symmetry to the sketch segments. This makes for a much more robust mirror sketch.
I have seen this too often with complex geometry being mirrored.
My latest example was complex corners for a dovetail groove cut path to be swept. In this particular case the lines were having a hard time with the coincident/merge of some of the points to the non complex (straight) lines (which weren't mirrored).
The only thing to abate was to delete the non mirrored geometry (straight lines) and redefine the point.
Below shown is a corner, the x is the line that needed to be redrawn, the red line directs you to the point that overdefined the sketch.
Crap. But it can be fixed.
Usually, when your sketch is having pattern with fully defined sketch.
You may face similar kind of problem that fully defined sketch become over defined.
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