Your writing mechanics are solid; I don't think you have anything to worry about there. If I have to nitpick, I'd rework the sentence "It is made of non-anomalous steel and is completely normal in every way except for two anomalous properties: it is capable of moving only in increments of 5 centimeters along its axes, it is capable of rotating only in increments of 45 degrees around its axes."
1. You're missing an and or a semicolon, between axes and it, I think.
2. I'd rework the sentence to remove the "completely normal in every way" part because that's redundant.
To answer your two questions, 1. yes, and 2. I think it would be a good idea for people who might not know how a ball bearing works.
As for the overall article, I think I'm in neutral vote territory. It is a cool start of an idea. Having some engineering background myself, I actually smiled while reading it. It has a Series-I style vibe, which I like about it—it has almost zero narrative bells and whistles, and it's trying to carry itself 100% on a cool, quirky idea.
That said, probably one of the problems here is that this is the sort of thing you look at and go, "doesn't this belong in the anomalous items list?" Which is to say, even if there is no narrative attached, I still think that you would greatly benefit from adding some more depth to this article. It's rather short and very bare-bones right now.
There are some hints of questions of intrigue and mystery behind this object that I think you might want to answer for yourself and then hint at in the article (which is the basic formula for adding depth without necessarily having to tack on a narrative). For example: who is the dude who made the thing? Why did they make it? Tying into the second question, what sort of machine or device was this thing designed to be used in, and why would someone want to make a device like that? Or other questions you might think of.
Without any window into the background, purpose, or deeper weirdness of the thing, it's just a cute idea that makes people who've used 3D editors chuckle. Personally, the thing needs to be developed more if I were to vote positively.