Re: Tolerance in text

[eric -dot- dunn -at- ca -dot- transport -dot- bombardier -dot- com]

"Gene Kim-Eng" wrote on 02/22/2006 11:26:04 PM:
> You certainly cannot take a
> dimension from someone else's email and "imply" a tolerance such as
> "25 mm actually means 25 mm + 0.49 mm / - 0.50 mm" without knowing
> what drafting standard is in use, or you end up with incidents like
> Challenger or Hubble.

My understanding of "implied" tolerance as brought to light in this thread 
was concerning rounding error. Something that should NEVER exists in 
engineering drawings. Based on that definition, there is no such thing as 
"implied" tolerances.

However, what Gene and Geoff are arguing are the same thing. Just from 
different perspectives. One from a knowledge of engineering standards and 
one from shop folklore concerning standard tolerances. No need for 
disagreement folks!

Only danger is when the shop hands refuse to abandon shop folklore for 
engineering demands. But, then again, shop folklore often trumps 
engineering theory.

Eric L. Dunn
Senior Technical Writer

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