More food for thought. Note: from a previous topic. Sorry for quoting and re-quoting, but read through both as needed.
Quote:
Dies were prepared at each mint themselves.
http://goccf.com/t/290196&SearchTer...hanks,,doug.http://www.doubleddie.com/58201.htmlQuote:
A major turning point for hub and die production in the U.S. Mints came in the summer of 1996 when the Denver Mint opened its own die making shop. Prior to this, all aspects of the die making process were done exclusively at the Philadelphia Mint. The new Denver die shop was equipped with the single-squeeze hubbing presses that the Mint started developing in the mid-1980's.
Reading further makes for an open window as the next paragraph in the article states Philadelphia was still producing the actual Master Hubs and Master Dies that Denver was using on there single-squeeze hubbing presses to create there Working Hubs and Working Dies from. Also sound like Denver did have some production runs made for San Francisco Mint.
Quote:
The die shop at the Denver Mint does not produce master hubs or master dies. All master hubs and master dies are still produced at the Philadelphia Mint. Master dies for coinage production at the Denver Mint are shipped to the Denver die shop from the Philadelphia Mint's die shop. The Denver die shop then produces the necessary working hubs and working dies in their die shop. The Denver die shop also produces the unfinished working dies that will be used at the San Francisco Mint. Once received from Denver, the working dies receive their special finishes for proof coin production at the San Francisco Mint.
The way I think it reads is Philly did make the Master Hubs and Master Dies.
Then distributed Master Dies only to Denver to produce Working Hubs and Working Dies for Denver and San Francisco. The Master Hub(s) remained at the Philadelphia mint.
Wexler's reference states it started in the summer of 1996 but, nothing on ending. So uncertain how long that processed continued. Could've been the one year or could've been longer.
In 1997 Philly was set up and began producing dies with the single-squeeze hubbing process but, no mention when or if they took back the die making and distribution for San Francisco. Seems I read that somewhere. Thanks, Doug.
John1's question.
Quote:
Also would like to know how doubled dies are possible with the single squeeze method of die making.
John1
Read somewhere and need to locate the link. Doubled dies are possible with the single squeeze method.
Single squeeze process is a bit misleading. I believe the process eliminates the need to heat treat and realign the dies like needed between the multi hubbing process.
I remember it stated there is typically a notable "POP" as the single squeeze process is in motion. If the progress is in doubt, the machine operator or supervisor have the option to stop and do an assessment or make adjustments and restart the process as needed. Thanks, Doug.
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Posted 09/20/2018 1:06 pm
