What You Need to Know About: Contact Marks

Great post Physics. Thanks for taking the time.

And agreed BR549 as one hitting one is a lot different then 4,000 hitting themselves and a lot more weight too.

 

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It was my first thought -- I will feel like I am back in Materials Science, smashing pennies! The good ol' days!:computer::computer::computer:

By the way, Jason, I read the article closely and enjoyed it. Thanks again.

 

I have a BS in Materials Science (Metallurgy) but there is no way I have the time or energy to complete these types of tests. You guys have fun though. Let us know how it turns out Doug.

 

encouraging others to damage coins eh? you think spock has already started playing his harp or what? i am watching you

 

Thanks for all your comments guys. It makes me feel good to know that you guys appreciate this sort of thing.

 

:bump: for the weekend crowd, like myself.

 

The one factor missing, Doug, is that the minting process itself produces heat. Coins ejected from a press are almost too hot to handle. This softens the metal which makes it easier for one coin to mark another.

 

That's was a great read and also very helpful. I've wondered how much a drop could damage and the pics are awesome. Thanks for posting this! (about six months ago, but my first time seeing it)

 

This thread is a great effort, thank you.

I can't believe the efforts that are required to instil a tiny bit of imagination in some individuals. The proof is in the pudding.

 

AWESOME!!!!!!. I have been LITERALLY (LOL) ERACKING NY BRAIN trying to figure out what I marked as "D" gouges....and NOBODY knew what the heck I was talking about. I thought (SURELY) that these MUST BE "SOMETHING" from the mint because it is on SOOOOOOOO MANY different years and denominatins. I SERIOUSLY have an ENTIRE bag full of them (One quarter being my "prized" coin.......They "LOOK" like the reeding on the edge/rim of dimes, quarters, etc. but SOME of them I TRULY thought some machine part or something like the Rockwell or Vickers test marks. Anyway, I've rambled enough and just wanted to **SINCERELY** thank you for clarifying them in SUCH an AWESOME way..... ESPECIALLY for us laymen (was gonna put "WE" laymen but I think "us" is correct....."WE" coin collectors think WAYYYY too muchlol.) Thanks again.
Very....VERY sincerely,
Michael

 

PS...SO very sorry for all of the grammatical errors. Hit send before I proofread. Not stupid. Just a mistake.