| Contenido del artículo |
- From johnmenc@optonline.net Sat Feb 09 10:10:46 2008
Return-Path: <johnmenc@optonline.net>
X-Sender: johnmenc@optonline.net
X-Apparently-To: colonial-coins@yahoogroups.com
X-Received: (qmail 30222 invoked from network); 9 Feb 2008 18:10:43 -0000
X-Received: from unknown (66.218.67.95)
by m44.grp.scd.yahoo.com with QMQP; 9 Feb 2008 18:10:43 -0000
X-Received: from unknown (HELO n50b.bullet.mail.sp1.yahoo.com) (66.163.168.164)
by mta16.grp.scd.yahoo.com with SMTP; 9 Feb 2008 18:10:43 -0000
X-Received: from [216.252.122.219] by n50.bullet.mail.sp1.yahoo.com with NNFMP; 09 Feb 2008 18:10:43 -0000
X-Received: from [209.73.164.83] by t4.bullet.sp1.yahoo.com with NNFMP; 09 Feb 2008 18:10:43 -0000
X-Received: from [66.218.66.91] by t7.bullet.scd.yahoo.com with NNFMP; 09 Feb 2008 18:10:42 -0000
Date: Sat, 09 Feb 2008 18:10:41 -0000
To: colonial-coins@yahoogroups.com
Message-ID: <fokqb1+n0hu@eGroups.com>
In-Reply-To: <380-22008269173358113@M2W009.mail2web.com>
User-Agent: eGroups-EW/0.82
MIME-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: quoted-printable
X-Mailer: Yahoo Groups Message Poster
X-Yahoo-Newman-Property: groups-compose
X-Originating-IP: 66.163.168.164
X-eGroups-Msg-Info: 1:6:0:0:0
X-Yahoo-Post-IP: 69.116.99.58
From: "John Lorenzo" <johnmenc@optonline.net>
Subject: Palmers Working Hub Test Piece
X-Yahoo-Group-Post: member; u=111282553; y=YMjJ4PVaLhqhnlMLme673Ac2e9eTpv2hRYZqEJvQ8orRhDoONddJK5UXJQ
X-Yahoo-Profile: colonial_john_c4
In one of the next rounds of my collection still to be auctioned=20
off ... for the civil war period ... are some hub trial impressions=20
from a known civil war token varieties that Bill Anton picked up=20
years ago from a Civil War specialist and sold to me - I believe two=20
pieces from a group of eight. There was an original group of about=20
eight pieces. About half were sold on E-Bay by me several years ago=20
with much enthusiasm. This seems to be the same case here? Jim=20
Spilman - would you consider Palmer's piece a Working Hub Test=20
Impression on soft metal prior to its use in making the actual=20
working dies to strike the blanks ... it maybe possible ... for a=20
large scale contemporary counterfeit manufactory. This in no way=20
looks like a finshed coin being impressed into soft medal.
Consider this background based on modern coinage methods -
Because making the Master Hub takes a lot of time and work, it is=20
used very few times. When needed, it is put into a special hubbing=20
press, which exerts a tremendous amount of pressure of approximately=20
1500 short tons-force per square inch (21 GPa), forcing the image of=20
the Master Hub into the Master Die. The Master Die is then used to=20
form as many Working Hubs as needed through the same process, and=20
then the Working Hubs are put through the same process to form the=20
Working Dies. These Working Dies are the actual dies which will=20
strike coins. The process of transferring the Hub to the Die can be=20
repeated as many times as necessary in order to form the number of=20
dies needed to make the amount of coins required. The difference=20
between a Hub and a Die is that the Hub has a raised image and a Die=20
has an incuse image, so one forms the other. When making Working=20
Dies, the Mint has found that by using a lower amount of pressure in=20
the hubbing press, they can prolong the life of the Hubs and Dies=20
used. In between each hubbing, however, the die being made must be=20
subjected to an annealing furnace to soften the steel, making it=20
easier to push the image into the Die. As the Die is compressed in=20
the hubbing press, the molecular structure of the steel changes. The=20
large amount of pressure exerted on the steel forces the molecules of=20
the steel to be compacted, making this hubbed die much stronger and=20
denser. In the field of metallurgy this is called work hardening, and=20
it is necessary to anneal the steel in order to get it malleable=20
again. If, when the die is subjected to another hubbing, it is not=20
lined up exactly with the hub, the result is a secondary image, or=20
doubling. This is called hub doubling, and results in such=20
spectacular coins as the famous 1955 doubled die cent.
KOOL piece Mr. Long Island ...
--- In colonial-coins@yahoogroups.com, "palmers4@..." <palmers4@...>=20
wrote:
>
> Bruce, Here is another for you to contemplate. Note that it is NOT=20
a die
> trial, BUT I didn't know what the heck else to call it<S> I do not=20
think it
> is strictly "idle hands", but I fail to see what you could do with=20
this, as
> it does appear to be made of lead, which is fairly soft for trying=20
to make
> a die or mold from. They are neat tho'. David
>=20
> Original Message:
> -----------------
> From: dlpalmer@...
> Date: Sat, 09 Feb 2008 12:27:12 -0500
> To: palmers4@...
> Subject: Emailing: OBV lead die trial
>=20
>=20
>=20
>=20
>=20
> --------------------------------------------------------------------
> mail2web.com - Microsoft=AE Exchange solutions from a leading=20
provider -
> http://link.mail2web.com/Business/Exchange
>
|
|---|
| URL de origen |
|
|---|
| Fecha de publicación |
|
|---|
| Volumen |
|
|---|
