Hi Burr,

> Small little "rotations" in geometry will produce errors in operations further down the
> road in my model, that will make it much harder to get back and fix.

Yeah that's certainly true that misalignments can cause problems later on.

But at a certain point when they get small enough it's a different kind of thing - if MoI only considered things that were "100% exactly" on the same plane as being planar, a whole lot of things would stop working at all since it's just fundamental to the way floating point mathematics on the computer work that there is a teeny tiny amount of fuzzy-ness to coordinates since the computer has to represent numbers in a limited amount of memory.

Don't get me wrong - it's not bad in general to want to have accuracy but it's just part of the whole way CAD on the computer works that there is a tiny amount of fuzz involved, and when the fuzz is teeny tiny small enough (like we're talking about in this specific case) it's a normal and expected thing.

Misalignments have to be a fair amount larger than 0.0000000000001 units for them to cause problems, generally speaking.

- Michael

Hi Michael,

> It will now consider these 2 to be coplanar. It did think that they were each planar before, but not that they were on the same plane.

That's interesting, so the 2 profiles were planar, I made the inner profile from circles then Boolean Union them together applied fillets then I took the whole profile and offset it outward, the only thing I can think of to check is the centres that I used for reference.

0.0000000000001 would be quite acceptable at work for precise Engineering seeing that our CAD analysis tools are set to show 9 decimal places anything after that wouldn't be seen and never had a problem even if we had a result of 1e-9 we wouldn't worry about it.

-

"""" it's just fundamental to the way floating point mathematics on the computer work that there is a teeny tiny amount of fuzzy-ness to coordinates """"""""

Ok, understand.....