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

This subject was covered on alt.machines.cnc and it seems
that the letter sizes had to do with the way drill rod was
formed. Try looking it up on deja.com. Or better here is a
link

http://www.deja.com/dnquery.xp?ST=QS&QRY=alt.machines.cnc+le
tter&svcclass=dncurrent&DBS=2

You will probably have to cut and paste to get it all on the
address line.
Darrell

----- Original Message -----
From: "Ken Jenkins" <kjenkins@...>
To: "CNC CNC" <CAD_CAM_EDM_DRO@egroups.com>
Sent: Monday, October 02, 2000 1:35 PM
Subject: [CAD_CAM_EDM_DRO] Slightly off-topic : History
behind lettered drills


> 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
>
>