Kathey,
        You have now discovered the joy of measuring three decimal
places with tools that measure out to four. Brian is correct in his
interpretation, though you find people that when presented with this
scenario will say that you round the third decimal up or down based on
the forth. They are wrong, you measure three decimal places pretending
that the forth one isn't even visible to you.

        It is fairly foolish to even concern yourself with the forth
decimal place when using such tools as digital calipers. If you look at
the specs for a common set such as the Mitutoyo Digimatic series, the
actual specs are resolution and repeatability of .0005", and an accuracy
of between .0010 - .0015" (depending on the distance measured). So the
fourth decimal is neat to look at, but doesn't really mean much....

Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Thursday, September 18, 2003 10:44 AM
To: [log in to unmask]
Subject: Re: [TN] Tolerances


It is within tolerance unless the dimension/tolerance is given as 0.1870
± 0.0020.

Brian

Kathy Kuhlow wrote:
> I am in a debate over assumptions or general knowledge with tolerances

> on a print.  I want to know which way you interpret the situation.
>
> Say you a print that has a part that should measure .187 +/- .002.
> Now your are measuring the part and the part measures .189 in a three
> digit but .1894 in a four digital measurement.  Would one assume that
> the part is actually .1870 which would say that the part is oversized
> or read tolerance only off of the third digit which would make the
> part acceptable?
>
> Thanks in advance.
> Kat
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