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Mirror issue - Sketch did not regenerate properly
florent_herbinger
Member Posts: 9 EDU
I have encountered an issue with the mirror feature. When I try to mirror my entire sketch around one of the rightmost vertical lines (see highlighted line in image below), the sketch fails to regenerate. I have no idea why. Please see document: https://cad.onshape.com/documents/38289b81c42f57fec9678e99/w/bda8e4d1354a6402fca87493/e/7e299d6f2f7d437d92d9cc8b
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That's an extremely involved sketch. It's better to keep your sketches simple and prefer to work at the part level. E.g., draw out a rectangle, extrude it, add and pattern hole features, add a simple sketch + extrude for a cutout and then pattern that.
In this case, it's hard to tell why it fails to solve. It may be that the resulting entities hit the sketch constraint limit.
Sometimes people suggest that sketches are too complex and I look and think, oh that shouldn’t be a problem. This is not one of them. The only time I’ve seen this many entities in a sketch is if they’re imported.
I can’t imagine trying to maintain this successfully ever. You’re lucky if you can sketch this from start to finish without it blowing up. It would be so much easier to manage as a simple layout sketch and a bunch of feature (most likely face) patterns. Sketch patterns can be useful, but in very limited situations and quantities.
I am making a model for a laser-cutter, so I only a need a 2D DXF file. Are you suggesting that extruding a smaller section and then using repeating patterns is the way to go? Afterwards, can I create a DXF file of only the top surface of the 3D model?
Yes. Even if all you need is a 2D DXF, I would model this as a 3D part and use pattern features at the part level, not sketch patterns. It will be much easier to manage and modify.
@florent_herbinger - once you have your 3D part made, right click on the face of interest and select "Export as DXF/DWG…" from the resulting popup. I use that approach routinely for generating DXFs for laser-cut parts.