Rick this might help on your article
http://www.starrett.com/download/222_p1_5.pdf
http://www.angrave.com/catalog/GageBlocks.html
but testing the accuracy of any measuring tool in an uncontrolled area will give you incorrect results. stacking gage blocks to achive an accurate dimension for testing will also give incorrect results. Gage blocks have a +/- tolerance, although small will effect the measurment in an uncontrolled enviroment.
For the average hobbist +/- .001 is close enough, and doesn't need to worry about the accuracy of the tool , just the repeatability.
Dave
--- In gingery_machines@yahoogroups.com, "Rick Sparber" <rgsparber@...> wrote:
>
> This article deals with assessing the accuracy of your mic using a set of
> spacer blocks. I am not a metrologist so fully expect that I have made a few
> really big bone-head mistakes here. However, with their help, I do expect to
> make enough corrections to appease at least most of the experts.
>
>
>
> This article is designed to appeal to both someone new to metal working and
> people with a few years of experience.
>
>
>
> If you are interested, please see
>
>
>
> http://rick.sparber.org/am.pdf
>
>
>
> As always, your questions and comments are welcome. All of us are smarter
> than any one of us.
>
>
>
> Rick
>
>
>
> [Non-text portions of this message have been removed]
>
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