Please explain this Jefferson Nickel

that gives no explanation for a raise device. None. Unless you can prove that this method can cause a raised device, then you have a theory that doesn't fit the facts.

FWIW

Ruben

 

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Go back and read it again. It is exactly like I said it is and is extremely plausible.
OK, let's say the debris was hard enough to cause damage to the die, you mean to tell me that this wouldn't cause a raised image on the coin?

Yes it would.

 

It can't. Even if it stuck to the die in would be incused. FWIW - I have doubts it is truly raised anyway.

 

I'll go with GDJMSP on his theory. However, I still believe that a piece of hard die fill could still damage a die. Let's say you drive a 4,000 lb vehicle on 7 inches of ice, all is well.
Now take that same 4,000 lb vehicle, turn it on it's bumper and place it on the ice. What's going to happen, it's going to either severly crack the ice, or go through. Whereas before when it was on all four wheels, the weight displacement was distributed more evenly accross the ice instead of being concentrated in such a small area as when it was balanced on its bumper.

This same theory can be applied to coin minting. The planchet would represent the 4,000 lb vehicle with even weight distribution and not causing harm to the die, whereas the peice of hard debris sitting on a planchet would cause extermely high pressure on that point of the die thus causing damage to it.

Again:

JMO

 

Ask Paul. He's the Meturalogist. My specialty is Thermodynamics and if what you said was the case, the die would never survive 10,000 strikes.

Ruben

 

???

 

Technically, I am not a metallurgist, but I do have a degree in metallurgy. The problem with your example is two fold. First, the size comparisons are way off. If the truck is the piece of debris on the planchet and the ice is the die, the ice would not be 7 inches thick, it would probably be more like 70 feet thick. Secondly, the hardness of the materials in your example is backwards. The truck is made of metal which is harder than the ice. In the minting process, there is no way that compacted grease and dirt are harder than the steel used to make the die.

I appreciate the thought that you put into your solution, but I find it impossible that remnants of a grease filled die could land on the planchet and then damage the working die.

Paul