Reducing Machine
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A Reducing Machine was a type of
US Mint who operated one as late as 2008 when it was replaced by CNC milling machines
.
History
Contamin Pantograph
From 1836 to 1867 the
US Mint operated the first die-engraving pantograph invented by a now forgotten French inventor whom the machine is named after. It used a rotating cutter to copy a design.[1]
Hill Pantograph
During the mid 1800s Englishman C. J. Hill developed a variation of the Contamin whereby the electrotype was traced horizontally using a
Janvier Reducing Machine
In 1899, French engraver
US Mint in 1907.[5]
EXTERNAL LINK Royal Mint Reducing Engine webpage https://www.royalmintmuseum.org.uk/journal/curators-corner/janvier-reducing-machine/
References
- ^ a b "Reduction Machines at the Mint". 1881o.com. Archived from the original on 19 December 2016. Retrieved 26 June 2017.
- ^ "The Janvier Die-Engraving Pantograph". coinbooks.org. Archived from the original on 5 April 2018. Retrieved 26 June 2017.
- ^ "Design and Die Making Video Transcript". Royal Mint Museum. Archived from the original on 11 June 2017. Retrieved 26 June 2017.
- ISBN 978-0521240260.
- ^ "How Dies are Made". doubleddie.com. Archived from the original on 12 July 2017. Retrieved 26 June 2017.