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

The yard came from the distance from the kings nose to the tip of his
fingers from which came the foot, inches and you know the rest. It was done
to measure cloth for the tailors with no thought for other applications.
Yes the French king did the same as they were always being cheated by the
English and they ended up with metric. The English lumber trade has
reverted back from metric to imperial as they say metric was just not
workable for them. Here in Canada we struggle with both, the government
decreed we were metric and everything changed but our biggest customer is
the good old USA hence our manufacturing proceeds with imperial.
Measurement is an exact science but boring !
Steve Roberts
Professional Engineer (Canada & UK)

----------

> From: Ken Jenkins <kjenkins@...>
> To: CNC CNC <CAD_CAM_EDM_DRO@egroups.com>
> Subject: [CAD_CAM_EDM_DRO] Slightly off-topic : History behind lettered

drills

> Date: Monday, October 02, 2000 4:35 PM
>
> 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.
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems, for CAD, CAM, EDM, and DRO.

>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager