What would you call a bowl impression ?

Ask your friend what causes a piece of wire to become brittle and break if you bend it back and forth.

 

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That's it. The die was frozen when it struck the OP coin. Thank you for setting me straight.

 

I just nearly peed my self

 

metalsuperkets .com how heating-metal-affects-its Properties. \V/

 

I hope you are wearing your depends.

 

There is a lot to learn about how dies are made and the process of striking coins. The heating and cooling of metal is an important part. The mint understands it well. I don't believe the mint freezes anything as part of that process. If they do I would love to learn about it.

 

Sir all I was doing was responding to an incorrect quote by casade, the quote was under heat pressure and stress a die shrinks. All I was stating was heat causes metal to expand cold causes metal to contract, I learned this over 40 years ago in my younger years. If any of you members would've taken a little bit of time to verify my statement by doing a little research on the effects of heat and cold on metal none of these idiotic statements would've been made luckily we have members out there that do their research before they make a quote. My personal experience with heat treating metal, heat the metal up to desired temperature then the metal goes into an oil bath cooling the metal down thus hardening the metal I'm sure the mint has their own formula for doing this to their specifications. I am sure all blacksmiths metalsmith whatever you prefer to call them have their own technique for hardening metal. And no sir the mint does not freeze anything except maybe replacement bearings and bushings for the equipment the mint uses. This statement can also be verified, would suggest before you make a stupid statement if you personally have not replaced a bushing or bearing there are many websites out there that explains the process Not expecting any of you to go out there and change bushings or bearings, this is only to give you a little more insight on cold effect on metal, a little more knowledge Can't hurt can it

 

I don't know weather to laugh or cry. I said nothing about die "shrinking" and I never said "under heat and pressure a die shrinks" put your glasses on before going down the wrong path bro.

I said a die face can sink from repeted use... Thereby creating a slight bowl looking effect on a struck coin

This is getting stupid now.

 

Yes. Everyone here understands that.

 

Yes. You are correct. Dies beat themselves to death. They distort, crack and loose detail over time.

 

Sir when I'm incorrect a man enough to admit it I miss read sinking for shrinking someone with dyslexia occasionally does this and that's no excuse so I do apologize and I took your statement wrong because of one word. I only hope we can just keep moving on, and thank you for pointing that out to me. Moving on I'm still going to stick with a early version struck thru. The only distortion in over 1000 coins that I have of these is the three letters in the liberty the rest of the coin looks great besides the bowl impression. \V/

 

Listen, if you really want to know send it to mike diamond at a cost of I think $8 or so plus shipping back. He writes the books on errors and varieties. He will tell you exactly what he thinks and you will.have a conclusive answer. If you really want to gain knowledge and not just make incorrect assumptions and run with them you have to realize that you don't know even know the basics yet and keep an open mind to those of us who know a thing or two. Heck, I barely know anything but I keep an open mind and listen to those who know more than I do. It's simple. Just ask questions and listen to those who know what they're talking about

 

Wait. He's gone from ME (whatever that is) to struck through without even blinking an eye (nor without even proving his ME theory to be incorrect). Pure genius.

 

As terrible as threads like this are for beginners reading them, this was four pages of fun, for me.

 

Sir your advice is appreciated, but ever since my stroke and disability I'm on a very tight budget the money you suggest that I spend, I think my food medication and medical bills and just living bills and my priority not some quarter with a bowl impression. It is important to me to know what caused this bowl impression and I'll keep searching on the Internet until I find what caused it or who caused it. you presented your theory I presented one theory isn't that what the talk is about and someone else has another theory that's what's great about living in the great USA we are allowed opinions we may not all agree and that's okay again thank you for your advice.

Don't be so happy. There is always some things we just don't know, like if Steve's press machine that makes the working dies was properly calibrated ? Improper calibration could result in a coin impression like the one on this coin, it would have to exceed the maximum pressure for this quarter will result in some kind of deformity. After Steve it goes to Tom. He inspects the die does the necessary detailing and if the die looks visually good you can only wonder if he actually laser inspects it or just preps it to be hardened, I don't even know if Tom's flash 500 has the laser measuring capabilities as the smart 500 does I can only hope someday an interviewer will ask these questions on the next interview at the mint. Earl don't feel left out it seems you're quite good at grinding these dies down to specifications. Keep up the good work, I believe we will know more about this coin anomaly as more of them get into circulation. like I'm trying to say lest just move on, it's only a quarter, PS since the mint does not have a job description for machinist that description is known as tool maker it would it be improper to call this a me coin (machinist error) it could possibly be a (TME) tool makers error. And it is possible I may have read it incorrectly about excessive pressure damage so I'll let you read it for your self. I would just like to know if the press was not calibrated and the press the working die and say 348 what would be the result of the overpressure on the working die Would be? See I still have a lot of questions

 

The world's longest non sequitur.

 

I have my glasses on my hearing aids in, I have my 10 powered magnifying glass in front of me my stereo microscope is warmed up. Now when I think of your quote it took me a while to come across the one example I wanted to use but I finally found it the coin that describes your opinion and the coin that I think of when I hear your opinion, these are not the best photos but I think they'll get the point across \V/

 

usmc60: A simple visual check will give you positive evidence of flatness.
Take two similar quarters showing similar wear.
Place them edge to edge on white background on a flat table.
Hold a straight flat edge of something like a plastic drafting triangle, held vertically, so equivalent sections of the faces are covered.
Shine a bright light at the back of the coins and observe the bright light coming through the gap to see if there is a difference.

 

Thank you a very helpful suggestion. I believe basically that's how I spotted the first one, trying to photograph it my lights came down on the coin creating a shadow, after visually examining I just want ahead and put a straight edge on it. As far as these two quarters the first one no way resembles the second one here they're very distinctly different, I know it's hard to judge by these poor quality photos but that's the best I can do for now. Basically the second one shows distinctive signs of die fatigue this may not be the proper word but they look like distinctive vertical stretch marks even on the reverse, which the first one has none. I'm sure members out there like myself who has gone through thousands of coins have seen and thrown back a lot of these coins, I know I have all I know is the first coin that I shown here does not have the signs of a fatigue die to me that's what made it interesting. One day when I get some extra money I may send both of these coins in for a professional opinion, But for right now when I go to the Miami VA and see all the homeless vets even in their hard times they still try to help others by offering free food vouchers I give the food voucher back along with a five that's a lot more important to me than get some professional opinions on a quarter. One day I may be able to accomplish both but until then I'll stick with helping the vets. Thank you for your advice \V/ usmc60 PS I show the straight edge process on either page 1 or two but instead Using a light I use the feeler gauge method this way I can get an exact measurement on the difference, this way is a lot more work but it's a lot more accurate and it answered the questions that I had.