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

Ken Jenkins wrote:

>
> Obviously fractional drill sizes go back to some part
> of a British king's anatomy, and we have the French
> to thank for metrics, numbered drills, I believe are
> related to standard wire guages ... but what about
> lettered A-Z drills. Where did they come from? Just
> curious.

Stubbs invented them - same size as the Stubbs gauge -... This
was all hashed out on the rec.machines.cnc list. Go to deja-news
and do a search for it.

JerryK