Re: [CAD_CAM_EDM_DRO] Slightly off-topic : History behind lettered drills

Paul Corner wrote:

>
> Hi Ian
>
> Go into any local retail outlet and ask the dimensions of a product.
> Nine times out of ten, it will be quoted in centimeters. Some of these
>
> teachers need to be stung up by the short'n'curlies.
>
> > difficult. The metric system, on the other hand, is very difficult
> to
> > visualise and, infact, is also difficult to teach as children cannot
> easily
> > work with the two most common measures, the metre and the millimetre
> so,
> > over here at least, schools start teaching using the centimetre - a
> > measurement that the kids never use again once they leave school.

Unless they work on cars, or with scientific equipment, chemistry,
physics, electronics
or aerospace gear. Yes, the old stuff was inches/pounds, but not
anymore.

Jon