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Gerhard Fiedler wrote:

>R. I. Nelson wrote:
>
>  
>
>>>>but we still tried and usually achieved 0 tolerance.
>>>>        
>>>>
>
>  
>
>>>Saying stuff like this that obviously can't be true just eliminates your
>>>credibility.  
>>>      
>>>
>
>  
>
>>This one gives readings of  0.0001 [...] There are micrometers available 
>>that have a resolution of 0.00002" and accuracy of 0.000015"
>>    
>>
>
>What Olin was responding to is you saying that you achieved "0 tolerance".
>  
>
The tolerance on the drawing  was +- 0.0005"  We had the ability, 
experience, a magnified eye piece and a  measuring device that was 
capable of reading  to an accuracy of 0.00005".  So being the means of 
measurement was 10 times finer then the tolerance specs called for  I 
think you can call ) out of tolerance parts. 

What olin said that I was taking issue with is "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."

If you want to discuss this further lets take it of list.



>When you measure that you're "right on" with an instrument that has 500 nm
>tolerance, then you only know that you are within +-500 nm of the target.
>(Simplified a bit.) You can turn and shake that as you like; that's a
>tolerance of +-500 nm, and not a tolerance of 0. You won't find an
>instrument with 0 tolerance, so you can't know whether you achieved 0
>tolerance. You only ever will know what tolerance you have achieved within
>the tolerance of the instrument you use to measure.
>
>Gerhard
>
>  
>


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