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As the title says: make it possible to flip the direction of a dimension in a sketch when you make the dimension negative. I used this feature a lot in SolidWorks in the past.
I have looked through the forums for this suggestion so if I missed it, I apologize. I reuse a lot of fairly complex parts and sketches. By that I mean, parts with hundreds of features and solid bodies. For the most part, this workflow works well, however, there are many times that I modify a sketch and the dimension will flip on me. My suggestion is simple, have a right-click option that allows you to flip the direction of the dimension. That way you don't have to lose the dimension and anything associated with it. Also, you don't have to delete the dimension, move the geometry, and apply a new dimension.
This does not negate the potential usefulness of what you are asking for, but there may be a better workaround in the meantime than what you have been doing.
Instead of deleting the dimension, make it Driven (Reference). Move the geometry, then make it a driving dimension again. This will let you resolve the problem without having to delete the dimension, so it doesn't mess up any parameter equations, exported property settings, etc. that are tied to the errant dimension. It's not as nice as what you're asking for, but it may ease some of the pain.
A negative dimension in Alibre Design also flips the dimension to the other side of the reference. One of the few good things about what is otherwise a dumpster fire of unfinished software. This would be great to see in Inventor too (or a flip button as suggested above, or both).
Sometimes a model change will cause a sketch to re-solve in such a way that a dimension gets flipped, with the left side geometry moving to the right side, even though the direction could have been maintained. This can be a serious problem if it goes unnoticed. It's also a serious problem when trying to build robust configurators.
Because there are some situations where a dimension should be able to flip, I propose a per-dimension option to "force direction" or "prevent flipping". If this option is checked, the dimension's direction would be forcibly maintained during any sketch re-solve. If the direction can't be maintained, the sketch would become sick, alerting the designer of the problem.
Related idea: Force sketch dimension to maintain direction (prevent flipping). Consider voting if one of the reasons you need to flip dimensions in the first place is because Inventor sometimes goes rogue and flips sketch dimensions during model updates.
Related idea: Force sketch dimension to maintain direction (prevent flipping). Consider voting if one of the reasons you need to flip dimensions in the first place is because Inventor sometimes goes rogue and flips sketch dimensions during model updates.
Related idea: Force sketch dimension to maintain direction (prevent flipping). Consider voting if one of the reasons you need to flip dimensions in the first place is because Inventor sometimes goes rogue and flips sketch dimensions during model updates.
Really, this shouldn't be required at all - The sketch should be stable enough to maintain with the changes. Granted there may be odd instances that cause something to go weird, but I agree that there needs to be some improvements in sketch stability and having some way to better control dimensions would be really good. I am not a huge fan of having the negative/positive dimensions. Would be nice if the software would automatically recognize the set dimension direction - and only permit moving IF it is a driven dimension.
@AlexZW28B great point, I agree. If the sketch solver can be improved such that dimensions never flip unless they HAVE to to satisfy all dimensions/constraints, that would eliminate most of my undesired flipping scenarios. That's really just how it should have been from the start. If that change can be made, then I really hope Autodesk does so.
But there's also the case where you want to explicitly say, "This dimension should NEVER flip, even if doing so is the only way to satisfy all dimensions/constraints", and for that I think we need an option.
I would be happy with this being done in stages. First fix the solver so dimensions never flip unless they have to. Then provide an option to say a dimension should NEVER flip, period.
