What do you call these lines?

Discussion in 'US Coins Forum' started by Insider, Dec 7, 2021.

?

What caused this characteristic?

Poll closed Dec 8, 2021.

  1. Die Polish

    15 vote(s)
    55.6%

  2. Cleaning Hairlines

    0 vote(s)
    0.0%

  3. scratches

    1 vote(s)
    3.7%

  4. Radials

    8 vote(s)
    29.6%

  5. worn die

    3 vote(s)
    11.1%
Page 2 of 2
  1. Treashunt

    Treashunt The Other Frank

    Darn, Lsparrow!

    That is as close to a like from Doug that any human being has ever gotten!


    Amazing.
     
    Treashunt, Dec 9, 2021
    #21 + Quote Reply
    -jeffB and micbraun like this.
  2. Avatar

    Guest User Guest



    to hide this ad.
  3. Insider

    Insider Talent on loan from...

    messydesk, posted: "I knew exactly what these were, so I called them "die wear." I've never hear the term "radials" used before other than tires. "Spiral flow lines" would be how I'd :bookworm::cigar: describe it more precisely. The denticles of fake British Trade Dollars don't get these right. The London issues (1925 and 1930) won't show these." [AFAIK its because the presses were different.]

    And since "sprial flow lines" is a more precise and perfect term, you have changed my usage forever, proving old dogs can learn new tricks. :D

    I'm at the Lakeland show in FL. Show report coming tonight.
     
    Insider, Dec 9, 2021
    #22 + Quote Reply
    john65999 and -jeffB like this.
  4. GDJMSP

    GDJMSP Numismatist Moderator

    That's about it in a nutshell.

    I'm just using this pic below as an example of the idea you're expressing.

    If I remember what I've read about it correctly the base of the the dies, and the press, were "keyed" kinda like what you see in this pic to hold them stationary and prevent them from twisting or turning. Not like this exactly, but in a similar way. And on the bases, not the top like this. ( what you see in the pic is a hub (L) and a die (R) )

    Reverse-Work-Hub-and-Struck-Die1.jpg


    Over time the key slots on the press, and at times the dies too, would wear from the repeated pressure and get a bit bigger, wider if you will. This would allow the twisting to occur at the time the pressure was highest. And the metal did not begin to flow until the pressure was high. And as it increased to its highest it would twist a bit more, causing the effect we see.

    The reason the twist effect did not occur in the devices is because the entire die would twist moving the devices as a whole, and the metal would be moving/flowing in a vertical direction to fill the holes in the die, not moving/flowing sideways/horizontally as the metal of the fields. That's why we don't see a shearing/twisting effect on the devices.
     
    GDJMSP, Dec 9, 2021
    #23 + Quote Reply
    john65999 likes this.
  5. GDJMSP

    GDJMSP Numismatist Moderator

    Nahhh, not at all Frank. When I like something I simply say - I like it ! And lots of folks have gotten those - just not you :D

    But what we have here is far better than a like - this is digital applause :)
     
    GDJMSP, Dec 9, 2021
    #24 + Quote Reply
    Kentucky, -jeffB and ddddd like this.
  6. whopper64

    whopper64 Well-Known Member

    Thanks for the very interesting lesson!
     
    whopper64, Dec 9, 2021
    #25 + Quote Reply
  7. Publius2

    Publius2 Well-Known Member

    I'll be there Friday. I'll make a point of saying hello. Can't go today because my coin club is having its holiday dinner tonight.
     
    Publius2, Dec 9, 2021
    #26 + Quote Reply
  8. justafarmer

    justafarmer Senior Member

    My thinking was the metal would be flowing vertically into the design devices at the same time the die was twisting. The planchet does not twist being the radials are caused by the die twisting on the planchet. But the metal which did flow vertically into the devices of the die would twist with the die and therefore should show evidence of shearing. Of course this thinking was wrong.
     
    justafarmer, Dec 9, 2021
    #27 + Quote Reply
  9. Treashunt

    Treashunt The Other Frank


    rats!
     
    Treashunt, Dec 9, 2021
    #28 + Quote Reply
    usmc 6123 likes this.
Page 2 of 2
Draft saved Draft deleted

Share This Page