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How Does Machine doubling occur?

dlimb2dlimb2 Posts: 3,449
in U.S. Coin Forum
Taking all answers...please.

Comments

  • mr1931Smr1931S Posts: 6,368 ✭✭✭✭✭
    Machine doubling is also known as ejection doubling.i think its caused in the split second of time just after the coin is struck from it's not coming cleanly out of the die on ejection.In other words,the coin shifts slightly while in the ejection mode just after being struck and,characteristic of machine doubling, a "shelf",is created on some features of the coin.

    “I believe in intuitions and inspirations. I sometimes feel that I am right. I do not know that I am. When two expeditions of scientists, financed by the Royal Academy, went forth to test my theory of relativity, I was convinced that their conclusions would tally with my hypothesis. I was not surprised when the eclipse of May 29, 1919, confirmed my intuitions. I would have been surprised if I had been wrong. I am enough of the artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.” Albert Einstein- quoted in Saturday Evening Post interview (1929)

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  • Dog97Dog97 Posts: 7,874 ✭✭✭
    I don't like typing too much...read this: Text
    Change that we can believe in is that change which is 90% silver.
  • ursabearursabear Posts: 1,888
    Wow, that is informative. Thank you Mr. Dog. That is in my bookmarks now.

    I do get to learn quite a bit here. I'm pretty lucky!
  • coppercoinscoppercoins Posts: 6,084 ✭✭✭
    You can try this thread as well. I typed out a rather long one that explains the difference between machine doubling and doubled dies. It might help you some.
    C. D. Daughtrey, NLG
    The Lincoln cent store:
    http://www.lincolncent.com

    My numismatic art work:
    http://www.cdaughtrey.com
    USAF veteran, 1986-1996 :: support our troops - the American way.
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  • cladkingcladking Posts: 28,702 ✭✭✭✭✭
    Mint workers have been quoted as saying that machine doubling is often
    associated with parts of the press being loose. This seem may be especially
    associated with the hold-downs.
    Tempus fugit.

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