"Roller Marks"

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"Roller Marks"

#1 Unread post by mhonzell »

Okay, I know it is just terminology, but we strive to get it right in this forum. So, either I have the wrong understanding, or we tend to mix up a couple of terms quite often.

(I'm asking for clarification so I get it right)
Three terms that get used to identify marks on coins:
1) Wheelmark, or Counting machine damage
2) Roller mark
3) Rolling machine damage

"Wheelmark", or "Counting machine damage"
Affects numerous 20th Century coins, even some of those that have been certified as problem free. The actual cause is the rubber wheel of a counting machine. Instead of gripping the coin and flinging it through, the wheel catches and skids across the surface of a coin, leaving a patch of micro-scratches in its wake. This is caused by the wheel not being adjusted properly for the thickness of coin being counted.

This will look like a tightly formed series of fine hairlines, which is sometimes thought to be a "cleaned" coin.

"Roller mark"
This is either when the sheet of metal is passed through dirty, or scored rollers to straighten, just prior to cutting planchets leaving fine, parallel, incuse lines in the planchet that do not get removed when the planchet is pressed between the two dies. Or, this is also thought to be attributed to a dirty draw bar, which the sheet metal passes through to ensure uniform thickness just before it is rolled and after it passes through the previously mentioned rollers to be cut into planchets.

Roller Marks.jpg
"Rolling machine damage"
When coins are put into un-formed paper rolls, the machine spins rapidly wrapping the coins in paper. Once the paper is applied, with the roll still rotating rapidly, curved clamps are applied to the end of the roll to crimp the ends. If there is slightly too much pressure, these clamps can bite into the end coins leaving partial to fully circular marks on one side of the coin. Sometimes, the clamps do not bite into the fields, but do come into contact with legends or date causing metal to be moved and reshaping the object hit.

(While I'm showing one nearly circular, these marks may be a short curved gouge running parallel to the rim.
Rolling Machine.jpg
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Rolling Machine2.jpg

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Re: "Roller Marks"

#2 Unread post by Paul »

i was just hugeeyes'n around,.....

it seems we get bunches of these questions ...

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Re: "Roller Marks"

#3 Unread post by PetesPockets55 »

Boy oh boy, I agree with Paul.
Thanks for the time and examples you put in this thread Mark.
Especially the half. Great example.

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