SR_Krause Wrote:
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>
> So I find absolutely no problem with a drawing
> with excess precision, because that drawing should
> ALSO specify the tolerance on that basic
> dimension. I.E., how accurate to that median value
> do you really need to be.
I imagine that the original cab may have been measured for duplication to the 1/32nd of an inch and then converted to decimal. That may have been four or eight times finer than the original construction plans.
Stating what the tolerances are is very important, but you've got to understand why they are called out. I once hard a story that has nothing to do with something like the cab, but it involves tolerances.
It goes that when Rolls-Royce obtained the rights to a American automatic transmission they thought the tolerances were sloppy and they could make it with tighter tolerances. Wrong! The transmission made with the tighter tolerances seized up. The "sloppy" tolerances were required to make it work.
Brian Norden