Charlie, You are correct about wood: that 0.002 is way past where you
need to be. However, for machining steel parts, 0.0002" is really nice.
Also, seems to me that if your stratig ege reference has an error of up
x, then your jointer can be up to square root of (2 x squared), root
mean squared (RMS). If you join two pieces that also gets RMS'ed so the
error is potentially twice the eror in the original reference straigth
Still not very much, but just for completeness, we ought to make note
of this effect -- unless this analysis is wrong -- and it sure could