from the old forum:
A weight tolerance has been added to the online design program.
It DOES estimate the worst case weight error that would be caused by a 0.002" diameter tolerance and a 0.002" length tolerance.
It DOES estimate the worst case weight variation from one cavity to the next.
It IS what the math predicts, nothing more or less.
It DOES NOT include the weight error due to density error. In other words, your pot of wheelweight may have a different density than my pot of wheelweight.
It DOES NOT include the weight error due to internal voids. No one knows how to predict or control internal voids.