1969 s Bash away my friends

Very prominent machine doubling. I’d certainly keep it as a great MD example.

 

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http://www.error-ref.com/push-doubling/

 

Sorry but that doesn't help at all. The article explains what the errors look like, and that they are caused by die bouncing, but nowhere in that article does it explain why the die bounces, or if "die wear" can cause the die to bounce.

 

A piece of metal hitting another piece of metal at speeds of 250 to 800 times per minute can cause bouncing. As like a hammer hitting a nail. Ironically the die that is moving is called a "hammer die".

Circulated coins are all about quantity, not quality. They use the coins for commerce, not for coin collectors weary eyes.

Keep in mind these are mostly horizontal stamping machines and they also need maintenance due to wear.
Ask a machinist about this basic process and they'll be able to enlighten you.

 

Yes, yes, but an earlier post stated that "die wear" would cause MD. I asked how, but neither the poster nor anyone else so far can tell me how this happens. What I'm looking for is someone who actually knows if this is true or not. Does a "worn" die come loose more easily than a new die? The poster implied that the wear they were talking about was on die surface, which I don't think makes sense at all that it could it cause MD, but could there be "wear" on the mounting surface that causes the die to become loose more easily, resulting in the chattering responsible for MD? Does anyone actually know?

 

Ah, there's nothing like a good "cooked home", er,...I mean "home cooked" meal!

 

excluding any mechanical action in relation to the minting process,

A die deteriorates over time because you have a metal piece banging against another metal piece (which is replaced each time). Dies are normally used from 1 to 3 days all dependent upon how quickly the metal fatigues and breaks down.

There is "early die state" all the way to "late die state"
in early die state the image on the coin is "crisp and sharp"
as metal fatigues and wears; pieces even fall off .. like a car tire if you may ... the "sharpness" decreases and you lose that sharpness except over a very short period of time.

also in the case of an individual letter, as an example, the sharp definition of that letter can loose the edges and start having flat, expanded areas around it.

but adding some mechanical action, MD is when the die shifts slightly while being struck. The die is replaceable in the "mount" and can come loose ever so slightly during it's use .. which can be during any phase of "die state".
http://www.lincolncentresource.com/FAQ/machinedoubling.html

you may want to read the articles in this thread
https://www.cointalk.com/threads/alternative-metals-testing-for-us-coinage.333055/

you have to remember this one thing ... Circulated coins are made for commerce, not for collecting in the eyes of the US MINT. Quantity supercedes quality.

If you want to look at Proof coins, then quality supercedes quantity.

but, you may be asking about varies problems in relation to the (a) die usage problem versus the (b) machine usage problems .. which can create various issues with the minted coin, especially when combined.

 

This is lots of good info, but is still not an answer. Let me state the question once again:

Does die wear increase the likelihood of MD occurring, and if so, why?

 

Good job

 

Ware And tare. A worn die is like a gear. Either the chain stretches or the gear wears down. Something loosens or wares down. Machines aren't like cointalk members. Their not perfect.

 

Nice find