You neatly covered both types of uncertainty, there, Bill.
I should have been more precise. "Classical" uncertainty, which, as you describe, arises from our inability to produce measuring devices sensitive enough to make absolutely precise measurements is something related to our ignorance, rather than to the essential nature of the thing being measured. That can change as technology improves, so, in principle, we might eventually be able to make a precise measurement and thus overcome classical uncertainty.
Quantum uncertainty, on the other hand, seems to be part of the nature of reality. It is this that makes me wonder if, for example, a particle can be said to actually have a precise position or energy.
There would seem to be two possibilities for reality within the scope of quantum uncertainty:
(1) A particle has precise position, but we can never discover it.
(2) A particle does not have a precise position.
Of course, it may not be possible for us to actually discover the answer to this, but it would be interesting to know what current thinking in scientific circles is.
