On Fri, 2009-06-12 at 19:33 -0400, Douglas Pollard wrote:
> No depth dimension was ever put on a tap drilled hole because you
> had likely ground a new lead on your tap when it was needed. The
> engineer didn't know how long the lead was so it was up to the machinist.
> The only notation on the tap drilled hole other than location might
> be "drill through or through drill". A tolerance was given on bolt hole
> location but no hole size, the machinist knew what size hole and counter
> bore based on location tolerance.
> In my opinion this was a huge complement and show of respect for the
> ability and knowledge of journeyman machinists.
I started out as a draftsman and my understanding is that drawings were
made for the purpose of describing the shape and material requirements
of parts and assemblies, not to tell machinists how to do their jobs,
but to communicate and record necessary information to allow all
concerned parties make acceptable parts. Many times I put something on a
drawing that the machinists or others didn't like, but were there for a
reason other than making life easier. On the other hand sometimes
drafters make mistakes, get lazy or engineers think they can be
drafters, and make poor documents. Since the drawing is the foundation
of a successful part or assembly, a good drafter would expect anyone
that finds a mistake or flaw in a drawing, that this issue should be
made known to the drafter, before further work is done. I know this
isn't how the real world works, but if I were King of the World...
Since I have some stiff competition,
"
(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.
"
I guess the world is safe for now.
--
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA
------------------------------------------------------------------------------
Crystal Reports - New Free Runtime and 30 Day Trial
Check out the new simplified licensing option that enables unlimited
royalty-free distribution of the report engine for externally facing
server and web deployment.
http://p.sf.net/sfu/businessobjects
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
