Some fascinating information on Proof coin dies 1936-42

CaptHenway

Here:

linky

luckybucks

Great info, I love stuff like this !!

ProofArtworkonCircs

<<These pages are from 1937 and describe events related to proof quarter dies. These pages are more verbose than others.>>
The reverse quarter die was considerably reworked for 1937 by lowering the field. Perhaps that is why more attention was paid to the quarter production.

keyman64

More great finds by Roger!

lasvegasteddy

thanks capt
some very interesting data there
hopefully this is a tip of an iceberg for this too and more can be learned about the 36' satin finish

Swampboy

Fascinating.
Thanks for posting.

morgandollar1878

Very cool, thanks for posting the link.

gonzer

Fascinating insight. Thanks Cap'n.

ricko

Very interesting information....thanks for posting the link...Cheers, RickO

etexmike

Thanks for the link. I am working on the 36 - 42 proofs and found the info very interesting. Hope more records are located.


Mike

numisma

Super cool information. Gives me goosebumps.

I like the #5 reverse die on August 13, 1937. They struck one coin and the die broke.

CaptHenway

I imagine that a certain percentage of all dies develop fatal flaws in the die-making process that manifest themselves when the dies are put under striking pressure.

ProofArtworkonCircs

<<I imagine that a certain percentage of all dies develop fatal flaws in the die-making process that manifest themselves when the dies are put under striking pressure.>>

I think the evidence shows new designs or new die alloy need a breakin period before die life settles down. I don't know why this would be, seeing as there are no obvious differences in the final product..

lasvegasteddy

<< <i><<I imagine that a certain percentage of all dies develop fatal flaws in the die-making process that manifest themselves when the dies are put under striking pressure.>>

I think the evidence shows new designs or new die alloy need a breakin period before die life settles down. I don't know why this would be, seeing as there are no obvious differences in the final product.. >>



<<< ex machinist who studied lots about general die making
some issues arise out of the alloy process being inconsistent...many a variable exist on the atomic level there
arrangement of all the different atoms just isn't within our full control

as much as dies go through a manufacturing process of being "hardened"...coining introduces an additional level of that hardening process called "work hardening"
minute fractures can cause a die to fatigue earlier then their designed life..."expectancy"

there is alot of variables that can go wrong and until final "use application" is applied
a die is just an unattested production piece until it goes into working application where even then on the atomic level "it adjusts"
to a die being in use..."WEAR YOUR SAFETY GLASSES AT ALL TIMES"


proofartwork
that's where one of the changes happen
is when a die goes from being hardened to it's work hardened state
those are 2 different states of being in a dies life

sometimes change is good..other times..."WEAR YOUR SAFETY GLASSES AS IT DOESN'T LIKE CHANGE"

CaptHenway

I seem to remember reading a description of the die hardening process in the early days of the Mint wherein when they dropped the red-hot die in a bucket of water to harden it and they could hear it crack, ruining the die.