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Re: Tolerance in text

Subject: Re: Tolerance in text
From: "Gene Kim-Eng" <techwr -at- genek -dot- com>
To: "TECHWR-L" <techwr-l -at- lists -dot- techwr-l -dot- com>
Date: Wed, 22 Feb 2006 08:08:10 -0800

There is (or should be) no such thing as "implied tolerance" in
engineering. Every drawing or manufacturing spec should
state a default tolerance for all numerical values that do not
contain their own individual tolerance. If there is not a note
somewhere that says something like "unless otherwise
specified, all measurements are ±x," any manufacturing engineer
or machinist worth his or her salt will return the instructions to
the design engineer because the specs are unusable.

Gene Kim-Eng


----- Original Message ----- From: "Geoff Lane" <geoff -at- gjctech -dot- co -dot- uk>

Perhaps as important is implied tolerance. Any dimension has an
implicit rounding tolerance. So, "25 mm" actually means
"25 mm + 0.49 mm / - 0.50 mm" because any dimension in that range
rounds to 25 mm to the nearest millimetre, which is the accuracy
implied by omitting the first decimal place.

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References:
Tolerance in text: From: Links, Diederik
Re: Tolerance in text: From: Geoff Lane

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