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Olin Lathrop wrote:

> R. I. Nelson wrote:
>
>> most of the stuff I did was + or - 0.0005".  but we
>> still tried and usually achieved 0 tolerance.
>
>
> Clearly not.  Saying stuff like this that obviously can't be true just
> eliminates your credibility.  

I think your credability has just been put in question with your above 
statement. http://www.mytoolstore.com/starrett/micro009.html.
This one gives readings of  0.0001

> Even if your tools told you the error was 0,
> that means it was only as close as the tool's accuracy and your 
> ability to
> read it.

using a magnifier attached to glasses to better read the scale  And a 
precision gage block that has been precision ground to check calibration.

There are micrometers available  that have a resolution of 0.00002" and 
accuracy of 0.000015"

I can send alink to that if you are interested.




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